description

asymmetric piston seal for standard applications. design provides stable fit in the housing, ultimate sealing effect over a wide temperature range. avoids extensive drag pressure. back-to-back arrangement with guide ring in between or for double acting pistons or to separate different fluids.

 

 

 

 

  • asymmetric single acting piston lipseal, with the dynamic sealing lip beeing shorter and thinner than the static one in order to avoid drag pressure built up.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static and dynamic sealing.
  • suitable for long travel.
  • little inclination to“stick-slip”.
  • low break-awayload after prolonged periods of standstill.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product

 

single acting

the PS 01 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

reciprocating pistons in hydraulic cylinders. piston seal for applications with small extrusion gap and without special impact load. can also be used as a pivot seal at low loads.

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between  nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597housings for piston and rod seals).
  • for short strokes the pS03  type is preferred.

 

function

PS 01 profiles are lip seals designed to seal pressurised space against the atmosphere or -in case of back to back arrangement with inter- mediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
 PU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
 HPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) ++ + ++
SPU -20 °C ... +110  °C 0,7 m/s 400 bar (40 MPa) ++ ++ ++
LTPU -50 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
GPU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) ++ + ++

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
100 bar (10 MPa) 0.18 0.22 0.32 0.38 0.45 0.53
200 bar (20 MPa) 0.12 0.16 0.25 0.33 0.40 0.45
300 bar (30 MPa) 0.07 0.13 0.21 0.28 0.36 0.42
400 bar (40 MPa) 0.05 0.10 0.19 0.26 0.33 0.39

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C.

use larger cross sections to increase maximum allowed gap dimension. if the permissible extrusion gap cannot be achieved, K02-P is to be used.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9


 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston  seal during installation, the piston and the housing is to be chamfered and rounded as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

 seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

asymmetric piston seal for standard applications as K01-P, but due to design with active back-up ring suitable for higher pressure range or larger extrusion gaps. PS 02 for short housing.

 

 

 

  • asymmetric single acting piston lipseal, with the dynamic sealing lip beeing shorter and thinner than the static one in order to avoid drag pressure built up.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • the active back up ring on the trailing side of the seal reduces extrusion wearand allows larger gap dimensions respectively higher system pressure.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 700 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static and dynamic sealing.
  • suitable for long travel.
  • little inclination to“stick-slip”.
  • low break-awayload after prolonged periods of standstill.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined product only

 

single acting

the PS 02 seal is designed  for use as a piston seal - either single or double acting where two seals are used ‘back to back’.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • piston seal for applications with large extrusion gap and without special impact load.

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between  nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597housings for piston and rod seals).
  • recovery  volume  is limited.
  • design K02-PD with triangular back up ring can lead to installation difficulties.

 

function

PS 02  profiles are lip seals designed  to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on applica- tion in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
 PU POM /PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
 HPU  POM / PA -20 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +
 SPU  POM / PA -20 °C ... +100  °C 0,7 m/s 700 bar (70 MPa) + + +
 LTPU POM /  PA -50 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
GPU POM / PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm.

note on special material:

as the temperature limits are determined by POM, using special materials for the back up ring can expand the temperature limits.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. ptfe materials).

note on special material:

as the temperature limits are determined by POM, using special materials for the back up ring can expand the temperature limits.

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C. use larger cross sections to increase maximum allowed gap dimension.

 

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9


 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

 

description

asymmetric piston seal for standard applications as K01-P, but due to design with active back-up ring suitable for higher pressure range or larger extrusion gaps. PS 02-A for standard  housing  design.

 

 

 

  • asymmetric single acting piston lipseal, with the dynamic sealing lip beeing shorter and thinner than the static one in order to avoid drag pressure built up.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • the active back up ring on the trailing side of the seal reduces extrusion wearand allows larger gap dimensions respectively higher system pressure.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 700 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static and dynamic sealing.
  • suitable for long travel.
  • little inclination to“stick-slip”.
  • low break-awayload after prolonged periods of standstill.
  • shorter seal heights require design PS 02-A .

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product

 

single acting

the PS 02-A seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • piston seal for applications with large extrusion gap and without special impact load.

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between  nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597housings for piston and rod seals).
  • recovery  volume  is limited
  • design PS 02-A with triangular back up ring can lead to installation difficulties.

 

function

PS 02-A profiles are lip seals designed  to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on applica- tion in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU POM /  PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
 HPU POM /  PA -20 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +
 SLPU POM /  PA -20 °C ... +100  °C 0,7 m/s 700 bar (70 MPa) + + +
LTPU POM /  PA -50 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
GPU POM / PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm.

note on special material:

as the temperature limits are determined by POM, using special materials for the back up ring can expand the temperature limits.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special material:

as the temperature limits are determined by POM, using special materials for the back up ring can expand the temperature limits.

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C. use larger cross sections to increase maximum allowed gap dimension.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

Piston Seal PS 02-A

 

 

recommended mounting space:

 plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible

 

insertion chamfer:

in order  to avoid damage  to the piston seal during installation, the piston  and the housing is to be chamfered and rounded as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 
 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

 don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

O-Ring activated, asymmetrical piston seal. interference fit on inside diameter maintains stable fit in the housing. design provides ultimate sealing effect. especially suitable for short stroke applications (e.g. spindle seals, coupling actua- tors…)

 

 

 

  • asymmetric single acting piston compact seal, with the dynamic sealing lip beeing shorter than the static one. In addition, an O-ring inserted into the groove increases the preload.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in all pressure ranges.
  • excellent static and dynamic sealing.
  • suitable for short travel.
  • no reverse leakage (i.e. minor relative  motion  of the sealing edges when  thedirection is changed).
  • recommended when holding or positioning under pressure.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined product only

 

single acting

the K03-P seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for switching functions (e.g.clutch operation).
  • as piston seals for clamping functions.
  • when an appropriate preload element is used,also suitable for low temperatures (down to -50°C).

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between nominal width and sealing height cs/H should not drop below  a value  of 1/1.25 (essentially according to ISO 5597housings for piston and rod seals).
  • high degree of friction.
  • high break-awaymoment.
  • the recovery volume  is smaller than with simple lip seals.
  • cross-section limited to 20 mm.

 

function

K03-P profiles are compact seals designed to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on applica- tion in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU  NBR -30 °C ... +100  °C 0,5 m/s 400 bar (40 MPa) - + ++
 HPU NBR -20 °C ... +100  °C 0,5 m/s 400 bar (40 MPa) - + ++
SPU  NBR -30 °C ... +100  °C 0,5 m/s 400 bar (40 MPa) - + ++
 LTPU NBR -20 °C ... +100  °C 0,7 m/s 400 bar (40 MPa) - ++ ++
 GPU NBR -30 °C ... +100  °C 0,5 m/s 400 bar (40 MPa) - + ++
LTPU  MVQ -50 °C ... +100  °C 0,5 m/s 400 bar (40 MPa)      

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special material:

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences).

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C.

use larger cross sections to increase maximum allowed gap dimension. if the permissible extrusion gap cannot be achieved, K04-P is to be used.

 

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). If metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston  and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see seal-mart catalog...

 the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

 don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

asymmetric piston seal for standard applications as PS 04 , but due to design with active back-up ring suitable for larger extrusion gaps. PS 04 for short housing.

 

 

 

 

 

  • asymmetric single-acting compact piston seals,with the dynamic sealinglip being shorter than the static one. in addition, an o-ring inserted into thegroove increases the preload.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • the active back up ring on the trailing side of the seal reduces extrusion wearand allows larger gap dimensions respectively higher system pressure.
  • for pressures up to 700 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static and dynamic sealing.
  • suitable for short travel.
  • recommended when holding or positioning under pressure.
  • no reverse leakage (i.e. minor relative  motion  of the sealing edges when  thedirection is changed).

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined product only

single acting

the PS 04 seal is designed  for use as a piston seal - either single or double acting where two seals are used ‘back to back’

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for switching functions (e.g.clutch operation).
  • as piston seals for clamping functions.

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between nominal width and sealing height cs/H should not drop  below  a value  of 1/1.25 (essentially according to ISO5597 housings for piston and rod seals).
  • high degree of friction.
  • high break-awaymoment.
  • the recovery volume  is smaller than with simple lip seals.
  • cross-section limited to 20 mm.

 

function

PS 04 profiles are compact  lip seals designed  to seal pressurised space against the atmosphere or in case of back to back ar- rangement with intermediate guide ring to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU POM / PA2 -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
HPU  POM /  PA2 -20 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +
SPU POM / PA2 -20 °C ... +100  °C 0,7 m/s 700 bar (70 MPa) + + +
 LTPU  POM / PA2 -50 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
GPU  POM /  PA2 -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. ptfe materials).

note on special materials:

materials such as Viton, Silicone, EPDM, H-NBR, etc. can also be used for the preload element, but they are only useful in specific cases (temperature or

chemical influences). the temperature limits are also determined by the supporting element; using special material can expand the temperature range.

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C. use larger cross sections to increase maximum allowed gap dimension.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

if for same cross-section a smaller height is used the design K04-PD could be necessary.

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

asymmetric piston seal for standard applications as K03-P, but due to design with active back-up ring suitable for larger extrusion gaps or higher pressure. K03-P for standard housing design.

 

 

 

 

  • asymmetric single-acting compact piston seals,with the dynamic sealinglip being shorter than the static one. in addition, an O-ring inserted into thegroove increases the preload.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • the active back up ring on the trailing side of the seal reduces extrusion wearand allows larger gap dimensions respectively higher system pressure.
  • for pressures up to 700 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static and dynamic sealing.
  • suitable for short travel.
  • recommended when holding or positioning under pressure.
  • no reverse leakage (i.e. minor relative  motion  of the sealing edges when  thedirection is changed).
  • shorter seal lengths require design K04-PD.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined product only

 

single acting

the PS 04-A seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for switching functions (e.g.clutch operation).
  • as piston seals for clamping functions.

 

note

  • this seal has the correct functioning dimensions only when mounted.in unmounted condition, the seal may appear too small.
  • the ratio between nominal width and sealing height cs/H should not drop  below  a value  of 1/1.25 (essentially according to ISO

5597 housings for piston and rod seals).

  • high degree of friction.
  • high break-awaymoment.
  • the recovery volume  is smaller than with simple lip seals.
  • cross-section limited to 20 mm.
  • design PS 04-A with triangular backupring can lead to installation difficulties.

 

function

PS 04-A profiles are compact  lip seals designed  to seal pressurised space against the atmosphere or - in case of back to back ar- rangement with intermediate guide ring to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU POM / PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
HPU POM /  PA -20 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +
 SLPU POM / PA -20 °C ... +100  °C 0,7 m/s 700 bar (70 MPa) + + +
LTPU POM / PA -50 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) - + +
GPU  POM /  PA -30 °C ... +100  °C 0,5 m/s 700 bar (70 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special materials:

materials such as Viton, Silicone, EPDM, H-NBR, etc. can also be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are also determined by the supporting element; using special material can expand the

temperature range.

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C. use larger cross sections to increase maximum allowed gap dimension.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement,  the distance between  the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

O-Ring activated symmetric piston seal for simple standard applications, not recommended for new designs.

 

 

 

 

  • symmetric single acting piston compact seal. an O-ring inserted into the groove increases the preload.
  • no interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • best sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in low pressure ranges.
  • excellent static and dynamic sealing.
  • suitable for short travel.
  • no reverse leakage (i.e. minor relative motion of the sealing edges when thedirection is changed).
  • recommended when holding or positioning under pressure.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

single acting

the PS 07 eal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for switching functions (e.g. clutch operation).
  • as piston seals for clamping functions.
  • replacement for rubber fabric seals of older equipment.

 

note

  • under certain operating conditions, this seal may “pump” via the trailing side, e. as it does not fit tightly on the inside diameter, small amounts of operating media may be pressed out when the seal is deformed under pressure which may result in additional drag pres- sure built up.
  • the ratio between nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597 housings for piston and rod seals).
  • high degree of fric
  • high break-away moment.
  • the recovery volume is smaller than with simple lip seals.
  • cross-section limited to 20
  • not suitable for new designs (prefer the more modern K03-P type).

 

function

PS 07  profiles are compact seals designed to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on applica- tion in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element back-up ring temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
 PU  NBR -30 °C ... +100 °C 0,5 m/s 400 bar (40 MPa) - + ++
 HPU NBR -20 °C ... +100 °C 0,5 m/s 400 bar (40 MPa) - + ++
SPU  NBR -30 °C ... +100 °C 0,5 m/s 400 bar (40 MPa) - + ++
 LTPU  NBR -20 °C ... +100 °C 0,7 m/s 400 bar (40 MPa) - ++ ++
GPU NBR -30 °C ... +100 °C 0,5 m/s 400 bar (40 MPa) - + ++

 

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                            o ... conditional suitable

+ ... suitable                                            - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention should be paid to restrictions for pressure range and wear resistance. for higher gliding speeds another system should be used (e.g. PTFE materials).

note on special materials:

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences).

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
200 bar (20 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
400 bar (40 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
600 bar (60 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
700 bar (70 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature of 70 °C.

use larger cross sections to increase maximum allowed gap dimension. if the permissible extrusion gap cannot be achieved, K04-P is to be used.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation: 2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure).

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

 

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

 don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

 

description

O-Ring activated symmetric PTFE pistonseal, low friction. for extreme low or highspeed, suitable for positioning functions. for mobile hydraulics, machine tools,injection moulding machines, heavy hydraulics. K08-D is used where  a pis- ton has pressure on both sides. PS 08 is provided with pressure-com-pensation grooves for rapid pressure change. very high resistance to pressure and hardness, good thermal conductivity, very good protection against extrusion, high resis- tance to abrasion, low friction, free of stick-slip.

 

 

 

 

 

  • asymmetric double-acting composite rod seals, with a gliding part made of low-friction material and an elastic preload element.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • the generously dimensioned chamfer reduces the risk of gap extrusion.
  • good sealing effect across a wide temperature range.
  • for pressures up to 400 bar (in special cases up to 800 bar) as a seal betweenpressurised spaces.
  • good static and dynamic sealing.
  • suitable for short and long travel with extremely slow or quick movements.
  • no stick-slip.
  • small break-awayload after prolonged periods of standstill.
  • exact positioning due to little friction.
  • high mechanical efficiency.
  • insensitive to thermal damage caused by air in the oil.
  • no drag pressure build-up.
  • radial grooves assure a fast pressure activation of the seal (design and ar-rangement see “fabrication tolerances for machined seals” ES 222.308-D).
  • this seal can run over holes which are smaller than nominal seal height if theholes have suitable chamfered edges.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 08 seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons on hydraulic cylinders,small swiveling motion permissible.
  • as piston seal for small permissible frictional forces or if smooth running is required.
  • dimensions according to ISO 7425 part 1 are common, as well as standard types that differ slightly in the depth of the mounting

space. for specific dimensions see “range of profile sizes”.

 

note

  • the calculation program is based on mounting spaces according to ISO 7425, part 1. intermediate sizes are possible, with an O-ring for standard  sizes. for deviating dimensions, use K08-DS. attention must be given to a balanced ratio between sealing part and preload element.
  • because of the fluid transport between the pressurized spaces this seal is only suitable to seal same media.

 

function

PS 08 profiles are composite piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

sealing element energizer temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PTFE glass NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
 PTFE bronze NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE carbon NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE glass FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE bronze FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE carbon FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa)  - ++ +
 PTFE glass EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
 PTFE bronze EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
 PTFE carbon EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE glass MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE bronze MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE carbon  MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
 UHMWPE  MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ + +
PU D57  NBR -30 °C ... +110 °C 5 m/s 600 bar (60 MPa)      

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our “list of resistance”. for decreased leackage rates elastomer materials (polyure-

thane or rubber) in other sealing systems are to be preferred.

note on special materials:

as temperature limit and chemical resistance are determined by the preload element, the temperature range can be increased and the resis-

tance to chemical influences improved, if a special material is used for the preload element.

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
2.45 3.75 5.5 7.75 10.5 12.25 14
safe extrusion gap (mm)
100 bar (10 MPa) 0.27 0.33 0.38 0.43 0.50 0.55 0.60
200 bar (20 MPa) 0.19 0.25 0.28 0.33 0.37 0.43 0.45
300 bar (30 MPa) 0.17 0.20 0.22 0.25 0.30 0.34 0.38
400 bar (40 MPa) 0.16 0.18 0.19 0.21 0.25 0.28 0.30

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table  refers to a operating temperature of 80°C. temperatures  below  may increase the safe extrusion gap slightly, at temperatures above 80 °C, the gap dimensions has to be reduced or a stronger profile selected.

for extrusion gap sizes resulting  from  tolerance  pair  H8/f8 pressure  ranges  above 400 bar can be reached  in special cases, influences due to thermal expansion have to be considered. we recommend to contact our technical department.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

in case of closed grooves, it is not recommended to slip the seal over the piston by hand (uneven material deformation in the sealing part). after the O-Ring is placed into the groove, the sealing part should be stretched over a installation cone by using a sleeve (assembly aid tools).

a recovery  of the sealing part with a calibrating  sleeve is advisable, however, a special shaped insertion chamfer on the cylinder barrel can also be designed (danger of tilting).

values for “c” see insertion chamfer.

 

 

recommended mounting space:

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 the ratio between  nominal  width  and seal height should be in accordance  to ISO 7425 part 1. we recommend the following values:

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

in case of large deviations of L use K08-DS

 

L R
≤ 4,2 max. 0,5
> 4,2 .....≤ 6,3 max. 0,8
> 6,3 .....≤ 8,1 max. 1,2
> 8,1 max. 2

 

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

two piece PS 08-A comprising one profile ring with pronounced sealing edge and one contact pressure element for producing the pre-load.

 

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 08-A seal is designed  for use as a piston seal.

 

area of application: hydraulics

  • earth moving equipment, agricultural machinery, injection moulding machines, industrial vehicles, cranes, loading platforms.
  • the PS 08-A profile is suitable for use in all standard industrial cylinders as well as in farming equipment, light construction machinery and mobile devices. due to the exceptionally high dynamic sealing performance, it is particularly suited for leakage critical applica- tions such as steering cylinders.

 

advantages

  • good static and dynamic tightness.
  • low friction, smooth movement even at low running speeds.
  • contact pressure element with rectan gular cross-section, prevents twisting in the housing.
  • standardised housings according to ISO 7425.
  • low axial housing heights.

 


operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element energizer
PU (98 Shore A) NBR 72 Shore A for D ≤63 -30 °C ... +100 °C 0.5 m/s 400 bar (40 MPa) - + ++
PU (98 Shore A) NBR 80 Shore A for D ≤63 -30 °C ... +100 °C 0.5 m/s 400 bar (40 MPa) - + ++
PU (60 Shore D) NBR 80 Shore A -35 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + ++

important note:

the above data are maximum  values and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, temperature and gap value. temperature range also dependent on medium.

1 pressure ratings are dependent on the size of the extrusion gap.

 

gap dimension

the largest gap dimension occurring on the non-pressurised side of the seal in operation is of vital importance for the function of the seal.

operating pressure cs = (ØD - Ød)/2 mm
3.2 4.2 6.3 8.1 10.5
max. permissible gap dimension
16 0.30 0.40 0.50 0.60 0.65
26 0.20 0.30 0.50 0.50 0.55
32 - 0.20 0.30 0.40 0.45
40 - - 0.25 0.35 0.40

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

the admissible gap width, tolerances, guide play and deflection of the guide under load are to be taken into account when designing ø piston.

seal housing tolerances
Ød h9
ØD H9

 

fitting & installation

careful fitting is a prerequisite  for the correct function of the seal.

the cylinder bore must have a leading edge chamfer. profile K08-SD can be snapped into closed grooves.

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

 

L R
≤ 10 max. 0,4
> 10 .....≤ 1,5 max. 0,8
> 15 max. 1,2

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

O-Ring activated symmetric PU piston seal with excellent static and dynamic sealing capacity, remely wear resistant.

  • asymmetric double-acting composite piston seals, with a gliding part made of excellent wear resistant polyurethane and an elastic preload element.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • the free space on the trailing side reduces the risk of gap extrusion.
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 250 bar as a seal between pressurised space and atmosphere.
  • excellent sealing in all pressure ranges.
  • excellent static and dynamic sealing.
  • suitable for short and long travel with extremely slow or quick movements.
  • no stick-slip.
  • small break-awayload after prolonged periods of standstill.
  • suitable for holding functions.
  • no drag pressure build-up.
  • radial grooves assure a fast pressure activation of the seal (design and arrange-
  • because of the excellent sealing effect a fluid transport between the pressurised spaces is practically  prevented.

 

application

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 08-AD seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons on hydraulic cylinders, small swivelling motion permissible. as piston seal at simple designs in medium pressure range.
  • dimensions according to ISO 7425 part 1 are common, as well as standard types that differ slightly in the depth of the mounting space. for specific dimensions see “range of profile sizes”.

 

note

the calculation  program is based on mounting spaces according to ISO 7425, part 1. intermediate sizes are possible, with an O-ring for standard  sizes. for deviating dimensions choose a different profile.

 

function

PS 08-AD profiles are composite piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element energizer
 PU NBR -30 °C ... +100 °C 1 m/s 250 bar (25 MPa) - + ++
 HPU NBR -20 °C ... +100 °C 1 m/s 250 bar (25 MPa) - + ++
 SPU  NBR -20 °C ... +100 °C 1 m/s 250 bar (25 MPa) - + ++
LTPU  NBR -30 °C ... +100 °C 1.4 m/s 250 bar (25 MPa) - ++ ++
 GPU NBR -30 °C ... +100 °C 1 m/s 250 bar (25 MPa) - + ++

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials in other systems are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special materials:

as temperature limit and chemical resistance are determined by the preload element, the temperature range can be increased and the resis-

tance to chemical influences improved, if a special material is used for the preload element.

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
2.45 3.75 5.5 7.75 10.5 12.25 14
safe extrusion gap (mm)
100 bar (10 MPa) 0.27 0.33 0.38 0.43 0.50 0.55 0.60
200 bar (20 MPa) 0.19 0.25 0.28 0.33 0.37 0.43 0.45
300 bar (30 MPa) 0.17 0.20 0.22 0.25 0.30 0.34 0.38
400 bar (40 MPa) 0.16 0.18 0.19 0.21 0.25 0.28 0.30

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the diagram applies to an operating temperature  of 70 °C.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

recommended housing for K08-P

L (ØD - Ød)/2 mm
3.2 3.75
4.2 5.50
6.3 7.75
10.50 8.1

 

mode of installation:

the seal can generally be snapped over the piston by hand without problems.

 

recommended mounting space:

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
2.45 2.5 1.5
3.75 3.5 2
5.5 4.5 3
7.75 5 3.5
10.5 6 5
12.25 8 6

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio  between  nominal width and seal height should be in accordance  to ISO 7425 part 1. we recommend the following values:

 

ØD [mm] ØD [mm] L [mm] cs = (ØD - Ød)/2 [mm]
8 ~ 14,9 ØD - 4,9 2,2 2.45
15 ~ 39,9 ØD - 7,5 3.2 3.75
40 ~ 79,9 ØD - 11 4.2 5.5
80 ~ 132,9 ØD - 15,5 6.3 7.75
133 ~ 329,9 ØD - 21 8.1 10.5
330 ~ 669,9 ØD - 24,5 8.1 12.25

 

L (ØD - Ød)/2 mm
3.2 3.75
4.2 5.50
6.3 7.75
10.50 8.1

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

the PS08-AQ5 is a double-acting seal consisting of a seal ring of high-grade modified PTFE

filled material, a X-Ring seal and an O-Ring as energizing element.

the K61 seal ring and the X-Ring seal together assume the dynamic sealing function whilst the O-Ring performs the static sealing function.

application

 

 not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS08-AQ5 seal is designed for use as a piston seal.

 

area of application: hydraulics

the PS08-AQ5 is the recommended sealing element for double acting pistons of accumulators and positioning and holding cylinders for:

  • machine tools
  • presses
  • accumulators
  • stabilisers
  • heavy duty suspension cylinders

media: for all common hydraulic fluids, including bio-oils and gases.

 

design

the PS08-AQ5 is supplied as standard  with radial notches on both sides. these ensure direct pressurizing of the seal under all operating condi- tions.

advantages

  • high sealing effect in applications requiring media separation, e.g. fluid/fluid or fluid/gas
  • double security through the combination of low-friction special materials with elastomer seals
  • outstanding sliding properties, no stick-slip effect

operating parameters & material for standard application:

for hydraulic components in mineral oils or medium with good lubricating performance.

standard material for hydraulics, high compressive strength, good sliding and wear properties, good extrusion resistance, BAM tested. mating surface material: steel tubes, steel hardened cast iron.

colour: greyish to dark brown.

 

operating parameters & material for special application:

for special applications requiring other material combinations,  please contact our technical department for further information.

for all lubricating and non-lubricating hydraulic fluids, hydraulic oils without zinc, water hydraulic, soft mating surfaces. Surface texture not suit- able for gases.

mating surface material: steel, cast iron, stainless steel, aluminium, bronze, alloys colour: grey

 

operating parameters & material for standar application:

for hydraulic components in mineral oils or medium with good lubricating performance.

for oil hydraulic and pneumatic for all lubricating and non-lubricating fluids, high extrusion resistance, good chemical resistance, BAM tested mating surface material: steel, stainless steel

colour: black

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

 

gap dimension

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

 

 

surface quality

surface roughness material

Rtmax (μm)

Rz DIN [µm]

Ra (μm)

mating surface PTFE + …… 0.63 - 2.50 0.40 - 1.60 0.05 - 0.20
PU & Rubber 1.00 - 4.00 0.63 - 2.50 0.10 - 0.40
groove surface < 16 < 10.0 < 1.6

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

the seal profile of the PS08-AQ5  has been redesigned on both the dynamic and static seal- ing surface. two O-rings are used to energize the seal instead of one.

the PS08-AQ5 combines the benefits of a low-friction PTFE filled slipper seal with the high sealing characteristics of an elastomeric seal by incorporating  a limited foot print X- ring seal in the dynamic  sealing face. this optimizes leakage control while minimizing friction.

the particular characteristics of the PS08-AQ5  are the special seal profile with a defined seal edge and the use of two O-Rings as energizing elements to optimize the pressure profile and to reduce the force of attack at gas permeability.

application

 

 

 

 

not bolded symbols; please consult our technical for application limitations

 

 

 

 

description

the seal profile of the PS08-AQ5  has been redesigned on both the dynamic and static seal- ing surface. two O-rings are used to energize the seal instead of one.

the PS08-AQ5 combines the benefits of a low-friction PTFE filled slipper seal with the high sealing characteristics of an elastomeric seal by incorporating  a limited foot print X- ring seal in the dynamic  sealing face. this optimizes leakage control while minimizing friction.

the particular characteristics of the PS08-AQ5  are the special seal profile with a defined seal edge and the use of two O-Rings as energizing elements to optimize the pressure profile and to reduce the force of attack at gas permeability.

 

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS08-AQ5  seal is designed for use as a piston seal.

 

area of application: hydraulics

the PS08-AQ5  is the recommended sealing element for double acting pistons of accumulators and positioning and holding cylinders for:

  • machine tools
  • presses
  • rolling mills
  • off shore
  • accumulators
  • heavy duty suspension cylinders

it is particularly recommended for heavy duty and large diameter applications. media: for all common hydraulic fluids, including bio-oils and gases

 

advantages

  • high sealing effect in applications requiring media separation, e.g. fluid/fluid or fluid/gas.
  • double security through the combination of low-friction special materials with elastomer seals.
  • low gas permeation rate.
  • outstanding sliding properties, no stick-slip effect.

 

operating parameters & material for standard application:

for hydraulic components in mineral oils or medium with good lubricating performance.

standard material for hydraulics, high compressive strength, good sliding and wear properties, good extrusion resistance, BAM tested. mating surface material: steel tubes, steel hardened cast iron.

colour: greyish to dark brown.

 

operating parameters & material for special application:

for special applications requiring other material combinations,  please contact our technical department for further information.

for all lubricating and non-lubricating hydraulic fluids, hydraulic oils without zinc, water hydraulic, soft mating surfaces. surface texture not suit- able for gases.

mating surface material: steel, cast iron, stainless steel, aluminium, bronze, alloys. colour: grey.

 

operating parameters & material for standard application:

for hydraulic components in mineral oils or medium with good lubricating performance.

for oil hydraulic and pneumatic for all lubricating and non-lubricating fluids, high extrusion resistance, good chemical resistance, BAM tested mating surface material: steel, stainless steel.

colour: black.

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

 

 

gap dimension

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

1 at pressures > 30 MPa use diameter tolerance H8/f8 (bore/piston) in area of the seal.

surface quality

surface roughness material

Rtmax (μm)

Rz DIN [µm]

Ra (μm)

mating surface PTFE + …… 0.63 - 2.50 0.40 - 1.60 0.05 - 0.20
PU & Rubber 1.00 - 4.00 0.63 - 2.50 0.10 - 0.40
groove surface < 16 < 10.0 < 1.6

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

O-Ring activated asymmetric  PTFE piston seal, low friction. for extreme lowor high speed.suitable for positioning functions. PS 08 can be used where  a sealing piston has pressure on one side, amongst others, in standar-dised housings ac- cording  to ISO 7425/1. Rod diameters in agreement with ISO 3320. Very high re- sistance to pressure and hardness, good thermal conductivity, very good protec- tion against extrusion, high resistance to abrasion, low friction, free of stick-slip.

 

 

 

 

 

 

  • asymmetric single-acting composite piston seals, with a gliding part made of low-friction material and an elastic preload element.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • the free space on the trailing side reduces the risk of gap extrusion.
  • highest degree of sealing across a wide temperature range.
  • sealing effect enhanced by high recovery.
  • for pressures up to 400 bar (in special cases up to 800 bar) as a seal between pressurised space and atmosphere.
  • good sealing in all pressure ranges.
  • good static and dynamic sealing.
  • suitable for short and long travel with extremely slow or quick movements.
  • no stick-slip.
  • small break-awayload after prolonged periods of standstill.
  • exact positioning due to little friction.
  • high mechanical efficiency.
  • insensitive to thermal damage caused by air in the oil.
  • tandem arrangement possible (similar to S09-E).

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

single acting

the PS 08-B seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating rods on hydraulic cylinders,small swiveling motion permissible.
  • as piston seal for small permissible frictional forces or if smooth running is required.
  • for heavy-dutyoperating conditions, profile K08-ES is preferred.

 

note

the calculation  program is based on mounting spaces according to ISO 7425, part 1. intermediate sizes are possible, with an O-ring for standard  sizes. for deviating dimensions, use PS 08. attention must be given to a balanced ratio between sealing part and preload ele- ment.

 

function

PS 08-B profiles are composite piston seals designed to seal pressurised space against the atmosphere; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element energizer
PTFE glass NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE bronze  NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
 PTFE carbon NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE glass FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
 PTFE bronze FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
PTFE carbon FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
 PTFE glass  EPDM -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE bronze  EPDM -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE carbon EPDM -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE glass MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
PTFE bronze MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
 PTFE carbon  MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
UHMWPE MVQ -60 °C ... +80 °C 10 m/s 400 bar (40 MPa) ++ + +
 XPU  NBR -30 °C ... +110 °C 5 m/s 600 bar (40 MPa)      

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our “list of resistance”. for decreased leackage rates elastomer materials (polyure-

thane or rubber) in other sealing systems are to be preferred.

note on special materials:

as temperature limit and chemical resistance are determined by the preload element, the temperature range can be increased and the resis-

tance to chemical influences improved, if a special material is used for the preload element.

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
2.45 3.75 5.5 7.75 10.5 12.25 14
safe extrusion gap (mm)
100 bar (10 MPa) 0.27 0.33 0.38 0.43 0.50 0.55 0.60
200 bar (20 MPa) 0.19 0.25 0.28 0.33 0.37 0.43 0.45
300 bar (30 MPa) 0.17 0.20 0.22 0.25 0.30 0.34 0.38
400 bar (40 MPa) 0.16 0.18 0.19 0.21 0.25 0.28 0.30

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table refers to a operating temperature of 80°C. temperatures  below may increase the safe extrusion gap slightly, at temperatures above

80 °C, the gap dimensions has to be reduced or a stronger profile selected.

for extrusion gap sizes resulting from tolerance  pair H8/f8 pressure ranges above 400 bar can be reached  in special cases, influences due

to thermal expansion have to be considered. we recommend to contact our technical department.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,1-0,5
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

in case of closed grooves, it is not recommended to slip the seal over the piston by hand (uneven material deformation in the sealing part). after the O-Ring is placed into the groove, the sealing part should be stretched over a installation cone by using a sleeve (assembly aid tools).

a recovery  of the sealing part with a calibrating  sleeve is advisable, however, a special shaped insertion chamfer on the cylinder barrel can also be designed (danger of tilting).

values for “c” see insertion chamfer.

 

recommended mounting space:

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
2.45 2.5 1.5
3.75 3.5 2
5.5 4.5 3
7.75 5 3.5
10.5 6 5
12.25 8 6
14 10 7

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

the ratio  between  nominal width and seal height should be in accordance  to ISO 7425 part 1. we recommend the following values:

ØD [mm] ØD [mm] L [mm] cs = (ØD - Ød)/2 [mm]
8 ~ 14,9 ØD - 4,9 2,2 2.45
15 ~ 39,9 ØD - 7,5 3.2 3.75
40 ~ 79,9 ØD - 11 4.2 5.5
80 ~ 132,9 ØD - 15,5 6.3 7.75
133 ~ 329,9 ØD - 21 8.1 10.5
330 ~ 669,9 ØD - 24,5 8.1 12.25
670 ~ 1000 ØD - 28 9.5 14
> 1000 ØD - 28 9.5 14

 

L (ØD - Ød)/2 mm
3.2 3.75
4.2 5.50
6.3 7.75
10.50 8.1

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

the PS 08-D is a rubber  energised plastic faced seal. the seal is designed to expand and improve the service parameters of O-Rings and is installed in existing O-Ring grooves. K08-SB combines the flexibility and response of O-Rings with the wear and friction characteristics of the PTFE series  materials in dynamic applications. the double acting performance of the seal follows from the symmetrical cross section which allow the seal to respond to pressure in both directions. initial contact pressure is provided by radial compression of the O-Ring. when the system pressure is increased the O-Ring transforms this into additional contact pressure, the contact pressure of the seal is thereby automatically adjusted so sealing is ensured under all service conditions. the drawing below shows the cross section of K08-SB, without and with pressure.

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 08-D seal is designed for use as a piston seal.

 

area of application: hydraulics

the PS 08-D is the recommended sealing element for double acting pistons of hydraulic or pneumatic cylinders in sectors such as:

  • machine tools, handling devices, manipulators, valves, chemical process equipment.
  • it is particular recommended for light duty and small diameter applications.

 

notches

 PS 08-D is as standard supplied without radial notches, as the thin radial section of the seal gives good response to pressure variations. for diameters from 8 mm notches on both sides are optional. these ensure direct pressurizing of the seal under all operating conditions.

advantages

  • compact groove dimensions and simple installation
  • low friction without stick-slip
  • resistance against wear and extrusion
  • piston seals available for all diameters from 5 to 999.9 mm
  • standard cross sections cover AS 568A and important metric O-Rings, other cross sections available on request
  • fits also groove dimensions per MIL-G-5514F

 

operating parameters & material for standard application:

for hydraulic components with reciprocating movement in mineral oils containing zinc or medium with good lubricating performance and hard mating surface.

standard material for hydraulics, high compressive strength, good sliding and wear properties, good extrusion resistance, BAM tested. mating surface material: steel tubes, steel hardened cast iron

colour: greyish to dark brown

 

operating parameters & material for special application:

short stroke movements, poor lubricating fluids and soft mating surfaces. for all lubricating and non-lubricating hydraulic fluids, soft matings urfaces

mating surface material: steel, steel hardened cast iron, stainless steel, aluminium, bronze colour: black

important note:

the above data are maximum  values and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the diagram applies to an operating temperature of 70 °C.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

 

gap dimension

important note:

the above data are maximum  values and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

surface quality

surface roughness material

Rtmax (μm)

Rz DIN [µm]

Ra (μm)

mating surface PTFE + …… 0.63 - 2.50 0.40 - 1.60 0.05 - 0.20
PU & Rubber 1.00 - 4.00 0.63 - 2.50 0.10 - 0.40
groove surface < 16 < 10.0 < 1.6

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

lead-in chamfers

in order to avoid damage to the seal during installation, lead-in chamfers and rounded edges must be provided on the bore or piston rod (see drawing below).

the minimum length of the lead-in chamfer depends on the profile size of the seal and can be seen from the following tables.

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

lead-in chamfers

in order to avoid damage to the seal during installation, lead-in chamfers and rounded edges must be provided on the bore or piston rod (see drawing below).

the minimum length of the lead-in chamfer depends on the profile size of the seal and can be seen from the following tables

Function
Piston seals are designed to seal the pressurized hydraulic fluid against the atmosphere
or between two pressurized spaces.

Features
Symmetrical, double acting piston seal, designed with interference of the O-Ring
on the ID and slight interference of the glide ring on the OD.
Glide ring commonly made in hard grade Polyurethane (PU-D57).
Excellent sealing performance in low and high speeds.
Suitable for positioning functions.
Negligible tendency to “stick-slip” effect, good sliding properties.
Low break-away load after long standstills.
Excellent gap extrusion resistance.


Application
Reciprocating pistons in hydraulic cylinders, plungers.
Dynamic seals in hydraulic systems.
Max. pressure 250 bar, max. speed 1 m/s (PU-D57)
Max. pressure 400 bar, max. speed 10 m/s (PTFE Materials)


Installation
Snap-in installation.
Attention: PTFE glide rings needs calibration after installation!




description

the piston sealing set profile K08-SF consists of a PTFE piston sealing ring and an O- ring. they are combined as a single unit and are appropriate for double-acting pistons in hydraulic & pneumatic cylinders.

profile K08-SF is particularly suitable for double-acting hydraulic & pneumatic pistons, e.g. in control cylinders, servo-assisted equipment, and in quick acting cylinders.

 

 

category of profile

machined or molded/standard/trade product.

 

area of application: hydraulics & pneumatics

advantages for hydraulics

double-acting piston seal for the lower pressure range with the properties of :

  • low friction.
  • low housing height.

 

advantages for pneumatics

  • assembly on one-piece piston.
  • short assembled length.
  • minimal break-out and dynamic slide friction. therefore no stick-slip. steady movement is guaranteed even at low velocities.
  • low wear.
  • high extrusion resistance.
  • high temperature resistance.

 

function

the K08-SF is a double acting piston seal. it is preferably used for existing housings which deviate from the norm. the reduced profile size of the PTFE sealing ring facilitates installation.


operating parameters & material

material temperature max. surface speed max. pressure 1 area of application
sealing element energizer
 PTFE carbon NBR 70 Shore A -30 °C ... +80 °C 4.0 m/s 160 bar (16 MPa) for pneumatic
PTFE bronze NBR 70 Shore A -30 °C ... +100 °C 2.0 m/s 160 bar (16 MPa) for hydraulic

important note:

the above data are maximum values and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, temperature and gap value. temperature range also dependent on medium.

1 pressure ratings are dependent on the size of the extrusion gap.

 

gap dimension

the largest gap dimension occurring on the non-pressurised side of the seal in operation is of vital importance for the function of the seal. we recommend a metal guide H8/f7.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

fitting & installation

careful fitting is a prerequisite for the correct function of the seal.

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

L R
≤ 10 max. 0,4
> 10 .....≤ 1,5 max. 0,8
> 15 max. 1,2

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

Function
Compact piston seal set, designed to seal the hydraulic fluid between two pressurized
spaces, preventing the flow of the fluid to the other side and transforming the pressure
force into the movement.
Features
Double acting piston seal, designed with interference on the ID which provides a
good static fit in the groove.
Consisting of one gliding, energizing, two back-up and two gide elements.
Useable for short and long stroke lengths.
Compact piston design possible
Good static and dynamic sealing performance.
Good positioning control.


Application
Reciprocating pistons in hydraulic cylinders.
Universal piston seal for double-acting cylinders.
Max. pressure 400 bar, max. speed 0.5 m/s.


Installation
Snap-in installation.
The deformation of the energizing element during installation should not exceed
30% - risk of permanent deformation!


description

chevron sealing set, parted surface design. in back-to-back arrangement with one in- termediate chevron for double sided pressure activation, in single acting applications with more intermediate chevrons possible. for heavy industry hydraulics.

  • symmetric single-acting piston sealing set consisting mainly of one chevrons, combined with pressure ring and support ring to form a set.
  • various materials are available for different purposes.
  • good sealing in all pressure ranges, particularly in the low pressure range.
  • for pressures up to 500 bar as a seal between pressurised spaces.
  • excellent static and dynamic sealing.
  • suitable for short and long travel.
  • very sturdy and wear-resistant.
  • insensitive to thermal damage caused by air in the oil.
  • open mounting space required (see mode of installation).
  • by combining various materials, the packing can be adjusted to the operating conditions.
  • by varying the number of packings, friction as well as leakage behaviour can be influenced.
  • the pressure and the support ring can be split for easier installation, the chevron snaps in the groove uncut (see mode of installation).
  • mainly used for repair purposes. use more modern systems for new designs.

 

application

 

not bolded symbols; please consult our technical for application limitations

category of profile

machined or molded/standard/trade product.

 

single acting

the PS1012-M seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders; small swivelling motion also permissible.
  • especially for heavy hydraulic applications or heavy-duty operating conditions.
  • for repairs of heavy machinery and for normal wear, when re-tightening is possible

 

note

  • expensive and complex desig
  • high degree of friction and thus little mechanical efficiency.
  • for large numbers. for small amounts, the K1012-T profile is preferred.
  • too many chevrons or too high clamping torque at installation can load to increased friction, and wear (for standard applications use

maximum 1 chevrons).

 

function

PS1012-M profiles are single-acting chevron seal sets designed to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

  • pressure ratings are dependent on the size of the extrusion gap.
  • POM up to ø260 mm, PA above ø260

++ ... particularly suitable                            o ... conditional suitable

+ ... suitable                                            - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, polyurethane materials increase wear resistance. for higher gliding speeds another sealing system should be used (e.g. PTFE materials).

gap dimension:

when using a pressure ring, the extrusion gap is already integrated in the seal. the gap between piston and housing should not exceed cs·0.05.

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h8
ØD H9

 

mode of installation

open housings are required.

in case of already existing closed grooves the pressure and the support ring can be split for installation (pressure ring with cutting gap 0). the

chevron has to be slipped in uncut. the support ring should be made of two parts (like ST08+K10) for easier installation into closed grooves.

 

recommended mounting space:

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation: 2-5% of D). if metalic guides are used, spiral grooves shall be provided.

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

the ratio between nominal width and seal height should be in accordance with following recommendations (see also manufacturing notes)

 

manufacturing notes

the following nominal widths are preferred. the theoretical packing height SH11 should be designed in accordance with the recommended values:

 

CS SH11
4 2.2
5 2.5
6 3
7.5 3.5
10 5
12.5 6
15 7.5
20 10
25 12.5
30 15

in order to be able to maintain the required production height irrespective of accumulated packing height ‘h’, the pressure ring is individually adjusted during the production of the V-packing set.

 

fitted:

 

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

chevron sealing set, machined surface design. in back-to-back arrangement with one intermediate chevron for double sided pressure activation, in single acting applica- tions with more intermediate chevrons possible. for heavy industry hydraulics.

  • symmetric single-acting piston sealing set consisting mainly of one chevrons, combined with pressure ring and support ring to form a set.
  • various materials are available for different purposes.
  • good sealing in all pressure ranges,particularly in the low pressure range.
  • for pressures up to 500 bar as a seal between pressurised spaces.
  • excellent static and dynamic sealing.
  • suitable for short and long travel.
  • very sturdy and wear-resistant.
  • insensitive to thermal damage caused by air in the oil.
  • open mounting space required (see mode of installation).
  • by combining various materials,the packing can be adjusted to the operating conditions.
  • by varying the number of packings,friction as well as leakage behaviour can be influenced.
  • the pressure and the support ring can be split for easier installation, the chevron snaps in the groove uncut (see mode of installation).
  • mainly used for repair purposes.use more modern systems for new designs.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

single acting

the PS 1012 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders; small swivelling motion also permissible.
  • especially for heavy hydraulic applications or heavy-dutyoperating conditions.
  • for repairs of heavy machinery and for normal wear,when re-tightening is possible

 

note

  • expensive and complex design.
  • high degree of friction and thus little mechanical efficiency.
  • for small amounts.for large numbers, the K1012-M profile is preferred.
  • too many chevrons or too high clamping torque at installation can load to increased friction, and wear (for standard applications use

maximum 1 chevrons).

 

function

PS 1012 profiles are single-acting chevron seal sets designed to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

 

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber ma-

terials are to be preferred, polyurethane materials increase wear resistance. for higher gliding speeds another sealing system should be used (e.g. PTFE

materials).

 

gap dimension:

when using a pressure ring, the extrusion gap is already integrated  in the seal. the gap between piston and housing should not exceed cs·0.05.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

open housings are required.

in case of already existing closed grooves  the pressure and the support ring can be split for installation  (pressure ring with cutting  gap 0). the

chevron has to be slipped in uncut. the support ring should be made of two parts (like ST08+K10) for easier installation into closed grooves.

 

recommended mounting space:

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

the ratio between nominal width and seal height should be in accordance with following recommendations (see also manufacturing notes)

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

manufacturing notes

the following nominal widths are preferred. the theoretical packing height SH11 should be designed in accordance with the recommended values:

 

 

CS SH11
4 2.2
5 2.5
6 3
7.5 3.5
10 5
12.5 6
15 7.5
20 10
25 12.5
30 15

in order to be able to maintain the required height irrespective of the accumulated packing height ‘h’, the pressure ring is individually adjusted during the production of the V-packing set. to do so, a control dimension  is provided  by the machine  software with a view to assisting this process.

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

chevron sealing set, design with flexible sealing lips, good sealing ability in higher pressure range. for heavy industry hydraulics, water-hydraulic systems.

 

 

 

 

 

 

  • symmetric single-acting piston sealing set consisting mainly of one chevrons, combined with pressure ring and support ring to form a set.
  • various materials are available for different purposes.
  • good sealing in the higher pressure range.
  • for pressures up to 600 bar as a seal between pressurised spaces.
  • excellent static and dynamic sealing.
  • suitable for short and long travel.
  • very sturdy and wear-resistant.
  • insensitive to thermal damage caused by air in the oil.
  • open mounting space required (see mode of installation).
  • by varying the number of packings,friction as well as leakage behaviour can be influenced.
  • the pressure and the support ring can be split for easier installation, the chevron snaps in the groove uncut (see mode of installation).
  • mainly used for repair purposes.use more modern systems for new designs.
  • friction is less than with the K1012 type,but greater than with more modern sealing systems (e.g. K08). the mechanical efficiency of this packing is thus less than that of more state- of-the-art systems.
  • the central support prevents wedging of the individual packings under pressure. therefore the frictional forces in the high pressure range are relatively low.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

single acting

the PS1315 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders; small swivelling motion also permissible. especially for heavy hydraulic applications or heavy-duty operating wear. conditions and in the case of tread.
  • used for sealing pistons and plungers of upstroke presses,where the return stroke is generated by it’s own weight.

 

note

  • expensive and complex design.
  • no adjustment possible.

 

function

PS1315 profiles are single-acting chevron seal sets designed to seal pressurised space against the atmosphere or - in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element spring
 PTFE 14.310 -200 °C ... +260 °C 15 m/s 100 bar (10 MPa) ++ ++ +
PTFE  glass 14.310 -200 °C ... +260 °C 15 m/s 160 bar (16 MPa) ++ ++ +
PTFE bronze 14.310 -200 °C ... +260 °C 15 m/s 160 bar (16 MPa) ++ ++ +
 UHMWPE 14.310 -200 °C ... +260 °C 15 m/s 200 bar (20 MPa) ++ + +

 the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials in other systems are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

 

gap dimension:

when using a pressure ring, the extrusion gap is already integrated  in the seal. the gap between piston and housing should not exceed cs·0.05.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

open housings are required.

in case of already existing closed grooves  the pressure and the support ring can be split for installation  (pressure ring with cutting  gap 0). the

chevron has to be slipped in uncut. the support ring should be made of two parts (like ST08+K10) for easier installation into closed grooves.

recommended mounting space:

 

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see seal-mart catalog...

 

the ratio between nominal width and seal height should be in accordance with following recommendations (see also manufacturing notes)

ØD [mm] L [mm] cs = (ØD - Ød)/2 [mm]
8 ~ 14,9 2,2 2.45
15 ~ 39,9 3.2 3.75
40 ~ 79,9 4.2 5.5
80 ~ 132,9 6.3 7.75
133 ~ 329,9 8.1 10.5
330 ~ 669,9 8.1 12.25
670 ~ 1000 9.5 14
> 1000 9.5 14

 

manufacturing notes

the following nominal widths are preferred. the theoretical packing height SH11 should be designed in accordance with the recommended values:

CS SH11
4 2.2
5 2.5
6 3
7.5 3.5
10 5
12.5 6
15 7.5
20 10
25 12.5
30 15

in order to be able to maintain the required height irrespective of the accumulated packing height ‘h’, the pressure ring is individually adjusted during the production of the V-packing set. to do so, a control dimension  is provided  by the NG40 software with a view to assisting this process.

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

simple cup seal, usually fixed on the piston by means of a clamping plate. mainly used for replacement in old hydraulic and pneumatic cylinders or for low-grade secondary applications. also used for food filling / portioning equipment.

 

 

 

 

 

 

 

  • asymmetric single-acting piston lip seals.
  • the profile is clamped at the flange, thereby ensuring stability and static sealingeffect.
  • various materials are available for different purposes.
  • sealing effect across a wide temperature range.
  • radial inaccuracy or excentricity can be compensated by varying the length ofthe lip.
  • for pressures up to 160 bar as a seal between pressurised space and atmosphere, pivoting and rotary movement and also long seal lips allow only lower values.
  • design A with chamfer,design B with radius (depending on housing).
  • suitable for long travel.
  • seal lip length affects to“stick-slip” behavior.
  • low break-awayload after prolonged periods of standstill.
  • mainly used as a replacement in older pneumatic or hydraulic cylinders.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

single acting

the PS16 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic and pneumatic cylinders,push rods and fittings.
  • piston seal for applications with small extrusion gap and without special impact load.
  • replacement for old leather seals.
  • can also be used in rotating and pivoting applications at low loads (see also materials).

 

note

  • special designed mounting space is required.
  • complicated installation.
  • do not use for new designs.
  • housings with integrated radius on the non pressurised side (common for old leather seals) do not allow design A.

 

function

PS16 profiles are lip seals with clamp flange (also referred to as “cup seals”), designed to seal pressurised space against the at- mosphere or in case of back-to-back arrangement - to seal between two pressurised spaces. mainly for reciprocating movements, but also for minor rotating and pivoting movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils, the use in pneumatic  systems is quite common as well. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU -30 °C ... +110  °C 0,5 m/s 160 bar (16 MPa) + + ++
HPU -20 °C ... +110  °C 0,5 m/s 160 bar (16 MPa) ++ + ++
GPU -30 °C ... +110  °C 0,5 m/s 160 bar (16 MPa)      
LTPU -50 °C ... +110  °C 0,5 m/s 160 bar (16 MPa) - + ++
SLPU -20 °C ... +110  °C 0,5 m/s 160 bar (16 MPa) ++ ++ ++
NBR -30 °C ... +100  °C 0,5 m/s 160 bar (16 MPa) - - O
FKM -20 °C ... +200  °C 0,5 m/s 160 bar (16 MPa) - - O
EPDM -50 °C ... +150  °C 0,5 m/s 160 bar (16 MPa) ++ - O
HNBR -25 °C ... +150  °C 0,5 m/s 160 bar (16 MPa) + O +

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber ma-

terials are to be preferred, Polyurethan materials increase wear resistance. for higher gliding speeds another system should be used (e.g. PTFE materials).

 

operating parameters for rotating applications

  PU rubber
maximum gliding speed [m/s] 2 3
maximum pressure [bar] 7 5

these values are not valid for continous duty and strongly depending on the lip geometry. they are not to be used simultaneously. we also recommend contacting our technical department.

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 10.5 15
max. permissible gap dimension
50 bar (5 MPa) 0.18 0.22 0.26 0.30 0.33 0.36
100 bar (10 MPa) 0.16 0.18 0.24 0.27 0.31 0.35
160 bar (16 MPa) 0.14 0.17 0.22 0.25 0.27 0.33

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
Ød1 h11
ØD H9

 

mode of installation

special shaped, open housings are required. the axial compression of the flange should not exceed 5 to 10% of the height , a clamping torque limitation should be arranged. to avoid twisting in the sealing lip, the compression should occur only at the clamp flange.

 

recommended mounting space:

 

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation: 2-5% of D). if metalic guides are used, spiral grooves shall be provided.

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible. radius R1 should be at least equal to the radius at the seal.

 

insertion chamfer:

in order to avoid damage to the piston  seal during  installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
2.45 2.5 1.5
3.75 3.5 2
5.5 4.5 3
7.75 5 3.5
10.5 6 5
12.25 8 6
14 10 7

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

this profile should only used as a replacement in already existing mounting spaces. use modern sealing systems for new designs.

 

fitted:

 

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

simple cup seal, usually fixed on the piston by means of a clamping plate. mainly used for replacement in old hydraulic and pneumatic cylinders or for low-grade secondary applications. also used for food filling / portioning equipment.

 

 

 

 

 

 

 

  • asymmetric single-acting piston lip seals.
  • the profile is clamped at the flange, thereby ensuring stability and static sealingeffect.
  • various materials are available for different purposes.
  • sealing effect across a wide temperature range.
  • radial inaccuracy or excentricity can be compensated by varying the length ofthe lip.
  • for pressures up to 160 bar as a seal between pressurised space and atmosphere, pivoting and rotary movement and also long seal lips allow only lower values.
  • design A with chamfer,design B with radius (depending on housing).
  • suitable for long travel.
  • seal lip length affects to“stick-slip” behavior.
  • low break-awayload after prolonged periods of standstill.
  • mainly used as a replacement in older pneumatic or hydraulic cylinders.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

single acting

the PS16 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic and pneumatic cylinders,push rods and fittings.
  • piston seal for applications with small extrusion gap and without special impact load.
  • replacement for old leather seals.
  • can also be used in rotating and pivoting applications at low loads (see also materials).

 

note

  • special designed mounting space is required.
  • complicated installation.
  • do not use for new designs.
  • housings with integrated radius on the non pressurised side (common for old leather seals) do not allow design A.

 

function

PS16 profiles are lip seals with clamp flange (also referred to as “cup seals”), designed to seal pressurised space against the at- mosphere or in case of back-to-back arrangement - to seal between two pressurised spaces. mainly for reciprocating movements, but also for minor rotating and pivoting movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils, the use in pneumatic systems is quite common as well. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
 PU -30 °C ... +110 °C 0,5 m/s 160 bar (16 MPa) + + ++
HPU -20 °C ... +110 °C 0,5 m/s 160 bar (16 MPa) ++ + ++
 GPU -30 °C ... +110 °C 0,5 m/s 160 bar (16 MPa)      
LTPU -50 °C ... +110 °C 0,5 m/s 160 bar (16 MPa) - + ++
 SLPU -20 °C ... +110 °C 0,5 m/s 160 bar (16 MPa) ++ ++ ++
 NBR -30 °C ... +100 °C 0,5 m/s 160 bar (16 MPa) - - O
FKM -20 °C ... +200 °C 0,5 m/s 160 bar (16 MPa) - - O
 EPDM -50 °C ... +150 °C 0,5 m/s 160 bar (16 MPa) ++ - O
 HNBR -25 °C ... +150 °C 0,5 m/s 160 bar (16 MPa) + O +

 

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

++ ... particularly suitable o ... conditional suitable

+ ... suitable - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber ma-

terials are to be preferred, Polyurethan materials increase wear resistance. for higher gliding speeds another system should be used (e.g. PTFE materials).

 

operating parameters for rotating applications

  PU rubber
maximum gliding speed [m/s] 2 3
maximum pressure [bar] 7 5

these values are not valid for continous duty and strongly depending on the lip geometry. they are not to be used simultaneously. we also recommend contacting our technical department.

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 10.5 15
max. permissible gap dimension
50 bar (5 MPa) 0.18 0.22 0.26 0.30 0.33 0.36
100 bar (10 MPa) 0.16 0.18 0.24 0.27 0.31 0.35
160 bar (16 MPa) 0.14 0.17 0.22 0.25 0.27 0.33

 

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature of 70 °C.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
Ød1 h11
ØD H9

 

mode of installation

special shaped, open housings are required. the axial compression of the flange should not exceed 5 to 10% of the height , a clamping torque limitation should be arranged. to avoid twisting in the sealing lip, the compression should occur only at the clamp flange.

 

recommended mounting space:

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation: 2-5% of D). if metalic guides are used, spiral grooves shall be provided.

in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible. radius R1 should be at least equal to the radius at the seal.

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
2.45 2.5 1.5
3.75 3.5 2
5.5 4.5 3
7.75 5 3.5
10.5 6 5
12.25 8 6
14 10 7

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

this profile should only used as a replacement in already existing mounting spaces. use modern sealing systems for new designs.

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

space saving, compact piston seal with integrated guiding elements. excellent static sealing capacity, good adaptation possibilities for diverse temperatures and media by selection of suitable material. suitable for small housings.

 

 

 

 

 

 

 

  • asymmetric double-acting compact  piston seal set, consisting of a sealing part and combined guiding-and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • high degree of sealing across a wide temperature range.
  • for pressures up to 250 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static and dynamic sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically  prevented.
  • 1 groove on the inside diameter of the preload element for local limiting the preload force.

 

application

 not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the       Piston seal PS 17 seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp. for moderate requests for movement.

 

note

  • the ratio between nominal width and sealing height cs/H should be approximately 1/2.
  • for cross sections above 10 mm we recommend  to use profile

 

function

K17-R profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
 NBR POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - - O
FKM   PTFE  glass -20 °C ... +200 °C 0.5 m/s 250 bar (25 MPa) - - O
 FKM PEEK -20 °C ... +200 °C 0.5 m/s 250 bar (25 MPa) - - O

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 pom up to ø260 mm, pa above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased wear resistance and higher pressure range

polyurethane materials are to be preferred, attention  should be paid to restrictions in chemical and thermal  resistance. for higher gliding speeds an- other sealing system should be used (e.g. PTFE materials).

note on special materials:

the temperature limits are determined by the guide- and support parts, using special materials can expand the temperature limits.

 

gap dimension

by using the guide and support parts, the extrusion gap for the sealing part is already  integrated  in the seal. the gap between piston and housing should not exceed (D-d1)·0.13 resp. 1mm, fabrication tolerances have to be included.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

the first guiding and backup element should be placed into the groove, then the sealing element should be slipped over the piston and snapped into the groove, then the second guiding and backup element should be placed into the groove. for inside diameters of 25mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring deformation force at installation, as- sembly aid tools are to be used for large cross sections. the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

 

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

 

instead of a chamfer, the piston can also be designed with a radius. Recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

 

the ratio between nominal width and seal height cs/H should be approximately 1/2. therefore we recommend the following housing heights.

 

ØD [mm]

Ød1 [mm]

cs = (ØD - Ød)/2 [mm]

L [mm]

L1 [mm]

20 ~ 49.9

D-3

4

10

18

50 ~ 79.9

D-3

5

10

18

80 ~ 119.9

D-4

7,5

15

23

120 ~ 199.9

D-5

10

20

33

200 ~ 399.9

D-6

12,5

25

39

400 ~ 750

D-8

15

30

44

> 750

D-8

20

40

54

we recommend to use K09-N for cross sections above  10 mm

 

 

fitted:

 

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

space saving, compact piston seal with integrated guiding elements excellent static sealing capacity, suitable for smallhousings.

 

 

 

 

 

 

 

 

  • asymmetric double-acting compact  piston seal set, consisting of a sealing part and combined guiding-and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves see notes on installation and recommended mounting space).
  • high degree of sealing across a wide temperature range.
  • for pressures up to 250 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static and dynamic sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically  prevented.
  • 1 groove on the inside diameter of the preload element for local limiting the preload force.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS17-A seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for moderate requests for movement.

 

note

  • the ratio between nominal width and sealing height cs/H should be approximately 1/2.
  • for cross sections above 10 mm we recommend to use profile K09-N.

 

function

PS17-A profiles are compact  piston seals designed  to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
PU POM /  PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - + +
HPU  POM / PA -20 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +
LTPU POM / PA -40 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + +
 SLPU POM / PA -20 °C ... +100 °C 0.7 m/s 250 bar (25 MPa) + ++ +
GPU POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +

 

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special materials:

the temperature limits are determined by the guide- and support parts, using special materials can expand the temperature limits.

 

gap dimension

by using the guide and support parts, the extrusion gap for the sealing part is already integrated  in the seal. the gap between piston and housing should not exceed (D-d1)·0.13 resp. 1mm, fabrication tolerances have to be included.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

the first guiding- and backup element should be placed into the groove, then the sealing element should be slipped over the piston and snapped into the groove, then the second guiding- and backup element should be placed into the groove. for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring deformation force at installation, as- sembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “rec- ommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

 

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should be approximately 1/2. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

we recommend to use K09-N for cross sections above 10 mm.

 

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

space saving, compact piston seal with integrated guiding elements excellent static sealing capacity, suitable for smallhousings.

 

 

 

 

 

 

 

 

  • asymmetric double-acting compact piston seal set, consisting of a sealing part and combined guiding-and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves see notes on installation and recommended mounting space).
  • high degree of sealing across a wide temperature range.
  • for pressures up to 250 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static and dynamic sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically prevented.
  • 1 groove on the inside diameter of the preload element for local limiting the preload force.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS17-A seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for moderate requests for movement.

 

note

  • the ratio between nominal width and sealing height cs/H should be approximately 1/2.
  • for cross sections above 10 mm we recommend to use profile K09-N.

 

function

PS17-A profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
PU  POM /  PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - + +
HPU  POM /PA -20 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +
LTPU POM /  PA -40 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + +
 SLPU  POM / PA -20 °C ... +100 °C 0.7 m/s 250 bar (25 MPa) + ++ +
GPU POM /  PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +

 

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable o ... conditional suitable

+ ... suitable - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention should be paid to restrictions for pressure range and wear resistance. for higher gliding speeds another system should be used (e.g. PTFE materials).

note on special materials:

the temperature limits are determined by the guide- and support parts, using special materials can expand the temperature limits.

 

gap dimension

by using the guide and support parts, the extrusion gap for the sealing part is already integrated in the seal. the gap between piston and housing should not exceed (D-d1)·0.13 resp. 1mm, fabrication tolerances have to be included.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

the first guiding- and backup element should be placed into the groove, then the sealing element should be slipped over the piston and snapped into the groove, then the second guiding- and backup element should be placed into the groove. for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring deformation force at installation, as- sembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “rec- ommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

 

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

the ratio between nominal width and seal height cs/H should be approximately 1/2. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

we recommend to use K09-N for cross sections above 10 mm.

 

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

finger-spring activated, asymmetrical PTFE piston seal, low friction and good dry run- ning properties, excellent chemical and thermal resistance, mainly used in chemical, pharma and food industry.

 

 

 

 

 

 

 

  • asymmetric single acting piston lip seal, with the dynamic sealing lip being shorter than the static one. the preload is created by a finger spring inserted in the groove.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • good sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 200 bar as a seal between pressurised space and atmosphere(in certain cases even above, see “gap dimensions”).
  • good sealing in all pressure ranges.
  • excellent static and dynamic sealing after short run-in time.
  • suitable for short and long travel.
  • small break-awayload.
  • no reverse leakage (i.e. minor relative  motion  of the sealing edges when  thedirection is changed).
  • little friction when dry running or when used in media with poor lubrication(conditionally suitable for use in aqueous media).
  • flexible sealing lip due to large spring travel.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

single acting

the PS 19 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

reciprocating and swiveling pistons in cylinders, push rods, fittings in the chemical industry.

 

note

  • special measures required when used at temperatures below -60°C, because of material shrinkage.
  • considering the limited long-time rupture strength of PTFE materials, the cs/H ratio should not fall below a value of 1/1.5.
  • cross-sections limited to 10 mm.
  • varying the angle of the chamfer on the dynamic sealing lip allows adaptation to media (steeper angle for high viscosity media) respec-

tively a pressure relief (flat angle).

 

function

PS 19 profiles are lip seals designed to seal pressurised space against the atmosphere or -in case of back to back arrangement with interme- diate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in aggres- sive media or with high thermal demands. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element spring
PTFE 14.310 -200 °C ... +260 °C 15 m/s 100 bar (10 MPa) ++ ++ +
PTFE  glass 14.310 -200 °C ... +260 °C 15 m/s 160 bar (16 MPa) ++ ++ +
PTFE bronze 14.310 -200 °C ... +260 °C 15 m/s 160 bar (16 MPa) ++ ++ +
UHMWPE 14.310 -200 °C ... +260 °C 15 m/s 200 bar (20 MPa) ++ + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our “list of resistance”. for decreased leackage rates elastomer materials (polyure-

thane or rubber) in other sealing systems are to be preferred.

 

gap dimension

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table refers to a operating temperature of 80°C. temperatures  below may increase the safe extrusion gap slightly, at temperatures above

80 °C, the gap dimensions has to be reduced or a stronger profile selected. in exceptional cases, a pressure above the limit of 200 bar is possible,

the safe extrusion gap is the result of the tolerance  pair H8/f8, influences  due to thermal  expansion  have to be considered. we also recommend

contacting our technical department.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

normally a open housing should be designed. the profile should not be snaped in, the spring may be damaged  and a faultless function can not be ensured. in special cases a snap-in installation is possible, therefore the housing has to be designed accordingly. the seal can only be held by a retaining housing step, having a width of 0.25·CS and a distinctive 30° chamfer, all edges must be rounded. the smallest possible diameter for such a snap-in installation is 10·CS.

 

recommended mounting space:

 

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. small values for Hmin allow slipping the seal over the piston, but the height of the retaining collar has to be sufficient to assure a stable fit in the housing (see “mode of installation”). in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

with PTFE materials, the profile size does not so much depend on the seal diameter but rather on pressure and extrusion gap. this relationship is described under “gap dimensions”. nominal widths not shown in the diagram can be interpolated.

cs = (ØD - Ød)/2 [mm] tolerances
2 3.5
3 5.1
4 6.5
5 8.8
10.2 6
12.8 7.5
17 10

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

the ratio between nominal width and seal height cs/H should not drop below 1/1.5. therefore we recommend the following housing heights.

 

 Function
Symmetrical piston/rod seals are designed to seal the pressurized hydraulic fluid against
the atmosphere or between two pressurized spaces.

 

 

 

 


Features
Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
Preload effected through round Helicoil-spring which ensures high pressure on
the sealing edges.
Excellent static and dynamic sealing performance.
Excellent sealing performance in low and high pressure ranges.
Useable for short and long stroke lengths.
Low friction in dry running or poor lubrication conditions.
Negligible tendency to “stick-slip” effect, small break away loads.


Application
Reciprocating and swivelling pistons in hydraulic cylinders, plungers.
Chemical and pharmaceutical industry, aggressive fluids and high temp.
Max. pressure 200 bar, max. speed 1 m/s


Installation
Installation in open housing, snap-in installation possible in special designed housings.
We recommend to maintain a nominal width/seal height ration (CS/NH) above 1/1,5.

 

 

Function
Symmetrical piston/rod seals are designed to seal the pressurized hydraulic fluid against
the atmosphere or between two pressurized spaces.

 

 

 

 


Features
Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
Preload effected through Helicoil-spring which ensures high pressure on
the rounded sealing lips..
Excellent static and dynamic sealing performance.
Excellent sealing performance in low and high pressure ranges.
Useable for short and long stroke lengths.
Low friction in dry running or poor lubrication conditions.
Also used for gas applications.
Negligible tendency to “stick-slip” effect, small break away loads.


Application
Reciprocating and swivelling pistons in hydraulic cylinders, plungers.
Chemical and pharmaceutical industry, aggressive fluids and high temp.
Max. pressure 160 bar, max. speed 5 m/s linear; 0,1m/s rotating.


Installation
Installation in open housing, snap-in installation possible in special designed housings.
We recommend to maintain a nominal width/seal height ration (CS/NH) above 1/1,5.

 

 

Function
Symmetrical piston/rod seals are designed to seal the pressurized hydraulic fluid against
the atmosphere or between two pressurized spaces.

 

 

 

 


Features
Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
Preload effected through round Helicoil-spring which ensures high pressure on
the sealing edges.
Excellent static and dynamic sealing performance.
Excellent sealing performance in low and high pressure ranges.
Useable for short and long stroke lengths.
Low friction in dry running or poor lubrication conditions.
Negligible tendency to “stick-slip” effect, small break away loads.


Application
Reciprocating and swivelling pistons in hydraulic cylinders, plungers.
Chemical and pharmaceutical industry, aggressive fluids and high temp.
Max. pressure 200 bar, max. speed 1 m/s


Installation
Installation in open housing, snap-in installation possible in special designed housings.
We recommend to maintain a nominal width/seal height ration (CS/NH) above 1/1,5.

 

description

space saving, compact piston seal, suit-able for standard O-Ring housings. advantage compared  to O-Ring: integrated  active back-up rings for high pressure, design with interference fit on outside diameter prevents twisting in dynamic applications.

 

 

 

 

 

 

 

  • asymmetric double-acting piston compact seal. the preload is achieved by the internal stress of the seal material.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • good sealing effect across a wide temperature range.
  • for pressures up to 700 bar as a seal pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static sealing.
  • little inclination to“stick-slip”.
  • the housing grooves are same as housing grooves for O-rings(see “range of profile sizes”)
  • the activated back up rings reduce the risk of gap extrusion and prevent  twisting in dynamic applications.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically  prevented.

 

application

not bolded symbols; please consult our technical for application limitations

 

  • asymmetric double-acting piston compact seal. the preload is achieved by the internal stress of the seal material.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • good sealing effect across a wide temperature range.
  • for pressures up to 700 bar as a seal pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static sealing.
  • little inclination to“stick-slip”.
  • the housing grooves are same as housing grooves for O-rings(see “range of

profile sizes”)

  • the activated back up rings reduce the risk of gap extrusion and prevent  twisting

in dynamic applications.

  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • because of the excellent sealing effect,a fluid transport between the pressurised

spaces is practically  prevented.

 

category of profile

machined only.

 

double acting

the PS 20 seal is designed for use as a piston seal.

 

area of application: hydraulics

  • static and dynamic seals in hydraulic and pneumatic systems.
  • use in systems with O-ringgrooves instead of O-rings in case of stability problems (twisting) or “pumping”.
  • for valve seals in offshore and aviation applications.

 

note

  • the design is based on standard O-ring dimensions according AS 568 A (american O-ring dimensions). in case of large deviations from standard groove dimensions the profile has to be checked .
  • a design in PU materials is not recommendable because of the large deformation force .
  • high break-awayload after prolonged periods of standstill.

 

function

PS20 profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements, but also for static application and for minor rotating and pivoting movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils, the use in pneumatic systems is furthermore possible. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
 PU  POM /PA2 -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - + +
HPU POM / PA -20 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +
LTPU POM /  PA -40 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + +
SLPU  POM / PA -20 °C ... +100 °C 0.7 m/s 250 bar (25 MPa) + ++ +
 GPU POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

3 attention: not suitable for mineral oils!

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased  wear resistance and higher pressure range

polyurethane materials in other systems are to be preferred, attention  should be paid to restrictions in chemical and thermal resistance.for higher glid- ing speeds another sealing system should be used (e.g. PTFE materials).

 

note on special materials:

as the temperature limits are determined by POM, using special materials for the back up ring can expand the temperature limits.

 

gap dimension

the size of the permissible gap on the side opposite the source of pressure depends mainly on the seal material and the design of the seal. if the permissible gap dimensions are exceeded, there will be extrusion wear on the side opposite the source of pressure which may make the seal unfit for usage. the maximum value of the permissible extrusion gap is reached  when the piston touches one side of the cylindrical tube or the guide. due to the small height of the back up rings and the resulting sensitivity to extrusion, the gap size is limited for all ranges of diameter, pressure and cross section  by the standard  hole/shaft basis fit f8/H8, influences  due to thermal  expansion  have to be considered.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

the sealing element should be slipped over the piston and snapped into the groove, followed by both backup elements. at installation, pay attention that the radius on the backup elements fits to the corresponding radius on the sealing element (nonsymmetric  backup elements). the installation of the backup elements  is generally  trouble-free, at installation of the sealing element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

the recommendations for mounting space heights and cross sections listed below are standard values for the corresponding O-Ring without (short), with one (medium) or with two (long) back-up rings.

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended

description

O-Ring activated symmetric piston seal with sharp edged sealing lips, good sealing effect for high viscosity fluids, not recommended for new designs (profile PS03-pre- ferred).

 

 

 

 

 

 

 

  • symmetric single acting piston compact seal. an O-ring inserted into the groove increases the preload.
  • no interference fit on the inside diameter.
  • sharp-edgedsealing lips for the use in high viscosity media.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • good sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery rate.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in all pressure ranges.
  • good static and dynamic sealing.
  • suitable for short travel.
  • no reverse leakage (i.e. minor relative  motion  of the sealing edges when  the direction is changed).
  • recommended when holding or positioning under pressure.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

single acting

the PS 21 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for switching functions (e.g. clutch operation).
  • as piston seals for clamping functions.
  • replacement for rubber fabric seals of older equipment.

 

note

  • under certain operating conditions, this seal may “pump” via the trailing side, i.e. as it does not fit tightly on the inside diameter, small amounts of operating media may be pressed out when the seal is deformed under pressure which may result in additional drag pres- sure built up.
  • the ratio between nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597 housings for piston and rod seals).
  • high degree of friction.
  • high break-awaymoment.
  • the recovery  volume  is smaller than with simple lip seals.
  • cross-section limited to 20 mm.
  • not suitable for new designs (prefer the more modern PS03-P type).

 

function

PS 21 profiles are compact seals designed to seal pressurised space against the atmosphere or in case of back to back arrangement with intermediate guide ring to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
PU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
HPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
GPU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
LTPU -50 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - ++ ++
SLPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

note on special materials:

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences).

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
100 bar (10 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
200 bar (20 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
300 bar (30 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
400 bar (40 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C.

use larger cross sections to increase maximum allowed gap dimension. if the permissible extrusion gap cannot be achieved, K02-P is to be

used.

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation 

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. smaller values for Hmin will ease the installation (reduced elongation and mounting force) but the height of the retaining col- lar has to be sufficient to assure a stable fit in the housing ( larger than cs/2, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure). in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between

the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

 

the ratio between nominal width and seal height cs/H should not drop below 1/1.25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

symmetric piston seal with support ring for simple applications to serve repair purpose, not recommended for new designs.

 

 

 

 

 

 

 

 

  • retainer  ring in angled design possible
  • symmetric single acting piston lip seals.
  • no interference fit on the inside diameter.
  • various materials are available for different purposes.
  • sealing effect across a wide temperature range.
  • sealing effect enhanced by high recovery.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • good static and dynamic sealing.
  • suitable for long travel.
  • little tendency to“stick-slip”.
  • small break-awayload after prolonged periods of standstill.
  • the stabilisation of the sealing element in the housing is achieved  by a retainer ring.
  • this retainer ring can be designed straight or as a angled ring (for easier centering and installation). the straight design has to be furnished with pressure relief grooves, the angled design needs balancing holes

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

single acting

the PS 22 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for applications with small extrusion gap and without specific impact load.
  • can also be used as a pivot seal in the case of small loads.
  • repair seal for older equipment.
  • replacement for rubber fabric seals of older equipment.

 

note

  • under certain operating conditions, this seal may “pump” via the trailing side, i.e. as it does not fit tightly on the inside diameter, small amounts of operating media may be pressed out when the seal is deformed under pressure which may result in additional drag pres- sure built up.
  • open housings are required.

 

function

PS 22 profiles are lip seals designed to seal pressurised space against the atmosphere or -in case of back to back arrangement with intermediate guidering – to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on applica- tion in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
PU POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - + ++
HPU POM / PA -20 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + ++
LTPU  POM / PA -40 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + ++
SLPU POM /  PA -20 °C ... +100 °C 0.7 m/s 250 bar (25 MPa) + ++ ++
GPU POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + ++

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials are to be preferred, attention  should be paid to restrictions for pressure range and wear resistance. for higher gliding  speeds another system should be used (e.g. PTFE materials).

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
100 bar (10 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
200 bar (20 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
300 bar (30 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
400 bar (40 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

 important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature  of 70 °C.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

open housings are required.

 

recommended mounting space:

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. the height of the retaining collar Hmin has to be sufficient to assure a stable fit in the housing ( larger than 2/3·cs, smaller retaining collars will increase the danger of eversion of the profile in case of occuring drag pressure). in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

profile ring-activated compact piston seal with integrated back-up rings. design for high pressure range, excellent static sealing capacity. mainly used in mining / tunnel- ing industry. external guiding elements required.

 

 

 

 

 

 

 

  • asymmetric double-acting compact piston seal set, consisting of a gliding part, a preload element and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 1500 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • improved guiding properties due to activated support elements.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically prevented.
  • increased preload and reinforced guiding and support elements especially for high pressure application.
  • 2 grooves on the inside diameter of the preload element for local limiting the preload force.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the PS 23-H seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for low requests for movement.
  • as piston seal in high pressure cylinders (e.g.mining).

 

note

  • very high frictional force.
  • the ratio between nominal width and sealing height cs/H should be approximately 1/ 2.5 (essentially according to ISO 6547 housings

for piston seals with integrated guide rings).

  • the guiding of the piston has to be assured by additional guiding elements.

 

function

PS 23-H profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

 

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable o ... conditional suitable

+ ... suitable - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance resp. for

higher gliding speeds PTFE-materials should be used (e.g. profile K09-F or a different sealing system).

note on special materials

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are determined by the guide- and support parts, using special materials can expand the

temperature limits.

 

gap dimension

by using support parts, the extrusion gap for the sealing part is already integrated in the seal. the gap between piston and housing should not exceed 0,4 mm.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

first of all the preload element should be slipped over the piston and snapped into the groove, then the first backup element should be placed into the groove, followed by the gliding part and then the second backup element. the installation of the backup elements as well as the gliding part is generally trouble-free, at installation of the preload element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

recommended mounting space:

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal seal catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

profile ring-activated compact piston seal with integrated back-up rings. excellent static and dynamic sealing capacity. external guiding elements required.

  • asymmetric double-acting compact piston seal set, consisting of a gliding part, a preload element and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static sealing and excellent dynamic sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • improved guiding properties due to activated back-up elements.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically  prevented.
  • 1 groove on the inside diameter of the preload element for local limiting the preload force.

 

 

application

 not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the PS 23-D seal is designed for use as a piston seal.

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals especially for increased requests on movement,but also for clamping functions.

 

note

  • high frictional force.
  • the ratio between nominal width and sealing height cs/H should be approximately  1/ 2.5 (essentially according to ISO 6547 housings

for piston seals with integrated guide rings).

  • the guiding of the piston has to be assured by additional guiding elements.

 

function

PS 23-D profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
s-mart PU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
s-mart HPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
s-mart GPU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
s-mart LTPU -50 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - ++ ++
s-mart SPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance resp. for

higher gliding speeds PTFE-materials should be used (e.g. profile K09-F or a different sealing system).

note on special materials

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are determined by the guide- and support parts, using special materials can expand the

temperature limits.

 

gap dimension

by using support parts, the extrusion gap for the sealing part is already integrated  in the seal. the gap between piston and housing should not exceed 0,4 mm.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

first of all the preload element should be slipped over the piston and snapped into the groove, then the first backup element should be placed into the groove, followed by the gliding part and then the second backup element. the installation of the backup elements as well as the gliding part is generally  trouble-free, at installation of the preload element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

 

recommended mounting space:

 

 

 

 

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the

“recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
5 4 2.5
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

 

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

 

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

description

profile ring-activated compact piston seal with integrated back-up rings. design for high pressure range, excellent static sealing capacity. mainly used in mining / tunnel- ing industry. external guiding elements required.

 

 

 

 

 

 

 

  • asymmetric double-acting compact piston seal set, consisting of a gliding part, a preload element and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 1500 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • improved guiding properties due to activated support elements.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically prevented.
  • increased preload and reinforced guiding and support elements especially for high pressure application.
  • 2 grooves on the inside diameter of the preload element for local limiting the preload force.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the PS 23-H seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for low requests for movement.
  • as piston seal in high pressure cylinders (e.g.mining).

 

note

  • very high frictional force.
  • the ratio between nominal width and sealing height cs/H should be approximately 1/ 2.5 (essentially according to ISO 6547 housings

for piston seals with integrated guide rings).

  • the guiding of the piston has to be assured by additional guiding elements.

 

function

PS 23-F profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

 

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable o ... conditional suitable

+ ... suitable - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance resp. for

higher gliding speeds PTFE-materials should be used (e.g. profile K09-F or a different sealing system).

note on special materials

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are determined by the guide- and support parts, using special materials can expand the

temperature limits.

 

gap dimension

by using support parts, the extrusion gap for the sealing part is already integrated in the seal. the gap between piston and housing should not exceed 0,4 mm.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

first of all the preload element should be slipped over the piston and snapped into the groove, then the first backup element should be placed into the groove, followed by the gliding part and then the second backup element. the installation of the backup elements as well as the gliding part is generally trouble-free, at installation of the preload element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

recommended mounting space:

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal seal catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

profile ring-activated compact piston seal with integrated back-up rings. design for high pressure range, excellent static sealing capacity. mainly used in mining / tunnel- ing industry. external guiding elements required.

 

 

 

 

 

 

 

  • asymmetric double-acting compact piston seal set, consisting of a gliding part, a preload element and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 1500 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • improved guiding properties due to activated support elements.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically  prevented.
  • increased preload and reinforced guiding and support elements especially for high pressure application.
  • 2 grooves on the inside diameter of the preload element for local limiting the preload force.

 

application

 not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the PS 23-H seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for low requests for movement.
  • as piston seal in high pressure cylinders (e.g.mining).

 

note

  • very high frictional force.
  • the ratio between nominal width and sealing height cs/H should be approximately  1/ 2.5 (essentially  according to ISO 6547 housings

for piston seals with integrated guide rings).

  • the guiding of the piston has to be assured by additional guiding elements.

 

function

PS 23-H profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

 

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance resp. for

higher gliding speeds PTFE-materials should be used (e.g. profile K09-F or a different sealing system).

note on special materials

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are determined by the guide- and support parts, using special materials can expand the

temperature limits.

 

gap dimension

by using support parts, the extrusion gap for the sealing part is already integrated  in the seal. the gap between  piston and housing should not exceed 0,4 mm.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

first of all the preload element should be slipped over the piston and snapped into the groove, then the first backup element should be placed into the groove, followed by the gliding part and then the second backup element. the installation of the backup elements as well as the gliding part is generally  trouble-free, at installation of the preload element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

recommended mounting space:

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal seal  catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

profile ring-activated compact piston seal with integrated back-up rings. design for high pressure range, excellent static sealing capacity. mainly used in mining / tunnel- ing industry. external guiding elements required.

 

  • asymmetric double-acting compact piston seal set, consisting of a gliding part, a preload element and backup elements.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • easy to slip over stepped grooves (see notes on installation and recommended mounting space).
  • highest degree of sealing across a wide temperature range.
  • for pressures up to 1500 bar as a seal between pressurised spaces.
  • excellent sealing in all pressure ranges.
  • very good static sealing.
  • suitable for short and long travel.
  • due to compact design an inexpensive construction of piston is possible.
  • no drag pressure build-up.
  • for holding functions.
  • improved guiding properties due to activated support elements.
  • because of the excellent sealing effect,a fluid transport between the pressurised spaces is practically prevented.
  • increased preload and reinforced guiding and support elements especially for high pressure application.
  • 2 grooves on the inside diameter of the preload element for local limiting the preload force.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

double acting

the PS 23-H seal is designed for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons in hydraulic cylinders.
  • as piston seals for clamping function resp.for low requests for movement.
  • as piston seal in high pressure cylinders (e.g.mining).

 

note

  • very high frictional force.
  • the ratio between nominal width and sealing height cs/H should be approximately 1/ 2.5 (essentially according to ISO 6547 housings

for piston seals with integrated guide rings).

  • the guiding of the piston has to be assured by additional guiding elements.

 

function

PS 23-H profiles are compact piston seals designed to seal between two pressurised spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the seal- ing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geom- etry in the software program.

 

operating parameters & material

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable o ... conditional suitable

+ ... suitable - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance resp. for

higher gliding speeds PTFE-materials should be used (e.g. profile K09-F or a different sealing system).

note on special materials

other materials such as Viton, Silicone, EPDM, H-NBR, etc., can be used for the preload element, but they are only useful in specific cases (tem-

perature or chemical influences). the temperature limits are determined by the guide- and support parts, using special materials can expand the

temperature limits.

 

gap dimension

by using support parts, the extrusion gap for the sealing part is already integrated in the seal. the gap between piston and housing should not exceed 0,4 mm.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

first of all the preload element should be slipped over the piston and snapped into the groove, then the first backup element should be placed into the groove, followed by the gliding part and then the second backup element. the installation of the backup elements as well as the gliding part is generally trouble-free, at installation of the preload element the material deformation should not exceed the value of 30%, otherwise the permanent deformation would be too large.

recommended mounting space:

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal seal catalog...

the ratio between nominal width and seal height cs/H should not drop below 1/1,25. therefore we recommend the following housing heights.

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

fitted:

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

chevron sealing set, design with extremely flexible sealing lips for difficult operating conditions like bad guiding, large tolerance range. availableas total chevron sealing set as well as intermediate chevrons only (in case of metal male andfemale adapters).

 

 

 

 

 

 

 

  • asymmetric single-acting piston sealing set consisting of several chevrons, com- bined with pressure and support ring to form a set. pressure and support ring are mainly made of metal or already integrated in metal housing.
  • various materials are available for different purposes.
  • good sealing in the higher pressure range.
  • for pressures up to 500 bar as a seal between pressurised spaces.
  • good static and very good dynamic sealing.
  • suitable especially for very long travel.
  • low friction due to flexible lip design.
  • open mounting space are required (see mode of installation).
  • by varying the number of packings,friction as well as leakage behavior can be influenced (at least 2 chevrons).
  • mainly used for repair purposes.use more modern systems for new designs.
  • the long,flexible lip can compensate guide clearance (e.g.: on long strokes).
  • due to the low contact pressure on the sealing lip surface,the piston can move back easily.

 

application

 not bolded symbols; please consult our technical for application limitations

 

category of profile

machined only.

 

single acting

the PS 32 seal is designed for use as a piston seal - either single or double acting where two seals are used ‘back to back’

 

area of application: hydraulics

  • linearly acting rods on hydraulic cylinders; plunger in down- and upstroke presses.
  • spindle seal at valves (at fittings).
  • cylinders with very long strokes,e.g. lifting ramps or hydraulic elevators.

 

note

  • expensive and complex design.
  • former designs mainly made in fabric reinforced rubber.replacing such fabric reinforced rubber seals by polyurethane  seals will

reduce the lubricating film (attention in case of more sealing rings).

  • reworked housings (changed cross-section) require adapted pressure and support rings made of plastic. if this is not possible (if pres-

sure and support rings are integrated  in the housing), it is recommended to consult our technical department for clarification.

 

function

PS 32 profiles are single acting piston seal sets designed to seal pressurised space against the atmosphere or - in case of back to back ar- rangement with intermediate guide ring to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element back-up ring
 PU POM / PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) - + +
HPU  POM / PA -20 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +
LTPU POM /PA -40 °C ... +110 °C 0.5 m/s 250 bar (25 MPa) - + +
SLPU POM /  PA -20 °C ... +100 °C 0.7 m/s 250 bar (25 MPa) + ++ +
GPU POM /  PA -30 °C ... +100 °C 0.5 m/s 250 bar (25 MPa) + + +

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm

++ ... particularly suitable                          o ... conditional suitable

+ ... suitable                                           - ... not suitable

 

gap dimension

when using a pressure ring, the extrusion gap is already integrated  in the seal. the gap between piston and housing should not exceed cs·0.05.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

open housings are required.

 

recommended mounting space:

 

plastic guiderings (wearbands) have to feature a adequate cutting gap (recommendation:  2-5% of D). if metalic guides are used, spiral grooves shall be provided. in order to avoid drag pressure built up in case of back-to-back arrangement, the distance between the seals should be as small as possible.

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

 

this profile is only a replacement in already existing housings. use new sealing systems in new designs

the nominal width and seal diameter should be in accordance with following recommendations:

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

compact piston seal with almost no deadspots as required for applications in food and pharma industry, also commonly used as O-Ring replacement, because design with interference fit on outside diameter maintains non twisting indynamic applica- tions.

 

 

 

 

 

 

 

  • asymmetric double-acting piston compact seal. the preload is achieved by the internal stress of the seal material.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • good sealing effect across a wide temperature range.
  • for pressures up to 400 bar as a seal between pressurised spaces.
  • good sealing in the low pressure range.
  • excellent static sealing.
  • only few dead spots.
  • the housing grooves are same as housing grooves for o-rings (see “range of profile sizes”)
  • no twisting in dynamic applications.
  • space-saving desig

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 35 seal is designed for use as a piston seal.

 

area of application: hydraulics

  • static and dynamic seals in hydraulic systems.
  • use in systems with O-ring grooves instead of O-rings in case of stability problems (twisting) or “pumping”.
  • as substitution for piston composite glide rings, if easy cleaning is required (e.g. piston chargers in food industry).
  • for food and pharma applications.

 

note

  • this seal has the correct functioning dimensions only when mounted. in unmounted condition, the seal may appear too small.
  • the ratio between nominal width and sealing height cs/H should not drop below a value of 1/1.25 (essentially according to ISO 5597

housings for piston and rod seals).

 

function

PS01 profiles are lip seals designed to seal pressurised space against the atmosphere or in case of back to back arrangement with intermedi- ate guidering to seal between two pressurised spaces, mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils. the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
 PU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
 HPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
 GPU -30 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++
LTPU -50 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - ++ ++
SPU -20 °C ... +110  °C 0,5 m/s 400 bar (40 MPa) - + ++

 

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

++ ... particularly suitable                            o ... conditional suitable

+ ... suitable                                            - ... not suitable

for detailed information regarding chemical resistance please refer to our „list of resistance“. for increased chemical and thermal resistance rubber

materials in other sealing systems are to be preferred, attention should be paid to restrictions for pressure range and wear resistance. for higher gliding speeds another system should be used (e.g. PTFE materials).

 

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
4 5 7.5 10 12.5 15
safe extrusion gap (mm)
100 bar (10 MPa) 0.62 0.75 0.90 1.15 1.35 1.50
200 bar (20 MPa) 0.27 0.36 0.45 0.55 0.65 0.75
300 bar (30 MPa) 0.17 0.19 0.21 0.23 0.25 0.26
400 bar (40 MPa) 0.05 0.07 0.10 0.13 0.15 0.17

important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table applies to an operating temperature of 70 °C.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h9
ØD H9

 

mode of installation

for inside diameters of 40mm and more, the seal can generally be slipped over the piston and snapped into closed grooves. due to occuring de- formation force at installation, assembly aid tools are to be used for large cross-sections. the material deformation should not exceed the value of 20%, otherwise the permanent deformation would be too large.

 

 

recommended mounting space:

 

 

insertion chamfer:

in order to avoid damage to the piston seal during installation, the piston and the housing is to be chamfered and rounded as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰ ... 20⁰ α = 20⁰ ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog...

 

we recommed the following values for cross sections and housing heights in accordance to the diameter range:

ØD [mm] Ød [mm] L [mm] cs = (ØD - Ød)/2 [mm]
5 ~ 24,9 ØD - 8 6 4
25 ~ 49,9 ØD - 10 7 5
50 ~ 74,9 ØD - 12 8 6
75 ~ 149,9 ØD - 16 10 7.5
150 ~ 299,9 ØD - 20 12 10
300 ~ 500 ØD - 24 18 12.5
500 ~ 750 ØD - 30 20 15
> 750 ØD - 40 26 20

use cross sections below 4mm only for static applications (O-Ring replacement).

 

 

fitted:

 

 don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

description

the PS 55 is a double-acting seal and guide element comprising an elastomeric profile seal ring, two back-up rings and two guide rings. the profile seal ring seals in both the static and dynamic range whilst the back-up rings prevent extrusion into the sealing gap. the function of the guide rings is to guide the piston in the cylinder tube and to absorb transverse forces. the design provides a compact seal and guide combination for a closed or split installation groove.

this type is characterized by the straight, long-sided l-profiles of the guide rings. compared with type K09-SB, it exhibits a smaller groove depth with the same cylinder diameter.

 

 

 

 

 

application

 not bolded symbols; please consult our technical for application limitations

 

category of profile

molded/standard/trade product or machined with minor design change.

 

double acting

the PS 55 seal is designed  for use as a piston seal.

 

area of application: hydraulics

the PS 55 are the recommended sealing element for double acting pistons of hydraulic components  such as:

  • machine tools
  • truck cranes
  • forklifts & handling machinery
  • agriculture equipment

 

advantages

  • good sealing effect, also suitable for holding cylinders.
  • capable of installation in closed grooves for reduced machining costs.
  • economic sealing and guiding solution.
  • simple snap installation.

 

 

operating parameters & material

material temperature max. surface speed max. pressure 1
sealing element back-up ring guide ring
NBR (70 Shore A) polyester elastomer POM -30 °C ... +100 °C 0.5 m/s 400 bar (40 MPa)
FPM  PTFE - Glass  PTFE + 40% BR -30 °C ... +200 °C 0.5 m/s 400 bar (40 MPa

 

 

 the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 POM up to ø260 mm, PA above ø260 mm.

media: mineral oil-based hydraulic fluids, flame retardant hydraulic fluids, HFA, HFB, HFC (< +40°C).

 

surface quality

surface roughness material Rtmax [µm] Rz DIN [µm] Ra [µm]

mating surface

PTFE + …… 0.63 - 2.50 0.40 - 1.60 0.05 - 0.20
PU & Rubber 1.00 - 4.00 0.63 - 2.50 0.10 - 0.40
groove surface < 16 < 10.0 < 1.6

 

gap dimension

the largest gap dimension occurring on the non-pressurised side of the seal in operation is of vital importance for the function of the seal.

 

tolerance recommendation

seal housing tolerances
Ød h9
Ød1 h9
ØD H9

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.

 

 

 

 

 

 

description

profile ring-activated symmetric PTFE piston seal, similar to K09-D, but special heavy duty design for heavy industry hydraulics or for special housing dimen- sions. PS 81 can be used where a piston has pressure on both sides and is designed especially for large diameters.

very high resistance to pressure, design prevents twisting, very good protection against extrusion, high resistance to abrasion, good thermal conductivity, low friction, free of stick-slip, high contact pressure due to elastomer profile ring.

 

  • asymmetric double-acting composite piston seal, with a gliding part made of low-friction material and an elastic preload element.
  • interference fit on the inside diameter.
  • various materials are available for different purposes.
  • snaps into simple grooves (see notes on installation).
  • the generously dimensioned chamfer reduces the risk of gap extrusion.
  • the massive profile ring makes only small relative movements and is thus not subject to specific wear.
  • preferably used for heavy-dutyapplications.
  • for standard application only if an O-ringis not available.
  • good sealing effect across wide temperature ranges.
  • for pressures up to 400 bar (in special cases up to 800 bar) as a seal between pressurized spaces.
  • good static and dynamic sealing.
  • suitable for short and long travel with extremely slow or quick movements.
  • no stick slip.
  • small break-awayload after prolonged periods of standstill.
  • exact positioning due to little friction.
  • high mechanical efficiency.
  • insensitive to thermal damage caused by air in the oil.
  • no drag pressure build-up.
  • high distortion stability.
  • high pressing force due to rubber profile ring.
  • radial grooves assure a fast pressure activation of the seal (design and arrangement see “fabrication tolerances for machined seals” ES222.308-D).
  • this seal can run over holes which are smaller than nominal seal height if the holes have suitable chamfered edges.

 

application

not bolded symbols; please consult our technical for application limitations

 

category of profile

machined or molded/standard/trade product.

 

double acting

the PS 81  seal is designed  for use as a piston seal.

 

area of application: hydraulics

  • reciprocating pistons on hydraulic cylinders,small swiveling motion permissible.
  • especially for larger diameter and heavy-dutyhydraulic applications.
  • as piston seal for small permissible frictional forces or if smooth running is required.
  • for heavy-dutyoperating conditions.

 

note

  • the ratio between nominal width and sealing height NB/H should range between 1/0.75 and 1/1.5.
  • because of the fluid transport between the pressurised spaces this seal can only be used to seal same media.

 

function

PS 81 profiles are composite  rod seals designed  to seal between pressurized spaces; mainly for reciprocating movements. the design is based on application in standard hydraulic systems with conventional hydraulic oils.

the operating parameters are as defined in the sealing data sheet and material data. requirements deviating from these parameters can be met to a certain degree by changing the geometry in the software program.

 

operating parameters & material

material temperature max. surface speed max. pressure 1 hydrolysis dry running wear resistance
sealing element energizer
s-mart PTFE glass s-mart NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE bronze s-mart NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE carbon s-mart NBR -30 °C ... +100 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE glass s-mart FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE bronze s-mart FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE carbon s-mart FKM -20 °C ... +200 °C 10 m/s 400 bar (40 MPa) - ++ +
s-mart PTFE glass s-mart EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart PTFE bronze s-mart EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart PTFE carbon s-mart EPDM2 -50 °C ... +150 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart PTFE glass s-mart MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart PTFE bronze s-mart MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart PTFE carbon s-mart MVQ -60 °C ... +200 °C 10 m/s 400 bar (40 MPa) ++ ++ +
s-mart UHMWPE s-mart MVQ -60 °C ... +80 °C 10 m/s 400 bar (40 MPa) ++ + +
s-mart XPU s-mart NBR -30 °C ... +110 °C 5 m/s 600 bar (40 MPa)      

the stated operation conditions represent general indications. it is recommended not to use all maximum  values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

1 pressure ratings are dependent on the size of the extrusion gap.

2 attention: not suitable for mineral oils!

++ ... particularly suitable                         o ... conditional suitable

+ ... suitable                                         - ... not suitable

for detailed information regarding chemical resistance please refer to our “list of resistance”. for decreased leackage rates elastomer materials (polyure-

thane or rubber) in other sealing systems are to be preferred.

 

gap dimension

operating pressure cs = (ØD - Ød)/2 mm
5 7.5 10 12.5 15 20
safe extrusion gap (mm)
100 bar (10 MPa) 0.38 0.43 0.50 0.56 0.65 0.83
200 bar (20 MPa) 0.28 0.32 0.35 0.42 0.50 0.64
300 bar (30 MPa) 0.22 0.25 0.30 0.34 0.42 0.56
400 bar (40 MPa) 0.19 0.22 0.24 0.29 0.36 0.49

 important note:

the above data are maximum value and can’t be used at the same time. e.g. the maximum operating speed depend on material type, pressure, tem- perature and gap value. temperature range also dependent on medium.

the table refers to a operating temperature of 80°C. temperatures  below may increase the safe extrusion gap slightly, at temperatures above

80 °C, the gap dimensions has to be reduced or a stronger profile selected.

for extrusion gap sizes resulting from tolerance  pair H8/f8 pressure ranges above 400 bar can be reached  in special cases, influences due to

thermal expansion have to be considered. we recommend to contact our technical department.

 

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤0,05-0,3
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤3

 

tolerance recommendation

seal housing tolerances
Ød h10
ØD H9

 

mode of installation

in case of closed grooves, it is not recommended to slip the seal over the piston by hand (uneven material deformation in the sealing part). after the O-Ring is placed into the groove, the sealing part should be stretched over a installation cone by using a sleeve (assembly aid tools).

a recovery  of the sealing part with a calibrating  sleeve is advisable, however, a special shaped insertion chamfer on the cylinder barrel can also be designed (danger of tilting). values for “c” see insertion chamfer.

 

recommended mounting space:

 

insertion chamfer:

in order to avoid damage  to the piston seal during installation, the piston and the housing is to be chamfered  and rounded  as shown in the “recommended mounting space” drawing. the size of chamfer depends on the seal type and profile width.

cs (mm) c (mm)
α = 15⁰  ... 20⁰ α = 20⁰  ... 30⁰
4 3.5 2
5 4 2.5
6 4.5 3
7.5 5 4
10 6 5
12.5 8.5 6.5
15 10 7.5
20 13 10

instead of a chamfer, the piston can also be designed with a radius. recommended size of the radius is equal to size of chamfer (R=c).

 

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars  catalog...

 

the ratio  between  nominal width and seal height should be in accordance  to ISO 7425 part 1. we recommend the following values:

ØD [mm] ØD [mm] L [mm] cs = (ØD - Ød)/2 [mm]
8 ~ 14,9 ØD - 4,9 2,2 2.45
15 ~ 39,9 ØD - 7,5 3.2 3.75
40 ~ 79,9 ØD - 11 4.2 5.5
80 ~ 132,9 ØD - 15,5 6.3 7.75
133 ~ 329,9 ØD - 21 8.1 10.5
330 ~ 669,9 ØD - 24,5 8.1 12.25
670 ~ 1000 ØD - 28 9.5 14
> 1000 ØD - 28 9.5 14

 

L (ØD - Ød)/2 mm
≤ 10 max. 0,4
> 10 .....≤ 1,5 max. 0,8
> 15 max. 1,2

 

fitted:

 

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.