description

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

 

 

 

 

 

 

  • asymmetric single-acting rod lip seals, with the dynamic sealing lip being shorter than the static one. in addition, an O-ring inserted into the groove increases the preload.
  • interference fit on the outside 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 space and atmosphere.
  • 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  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 RS03 seal is designed  for use as a rod seal.

 

area of application: hydraulics

  • reciprocating rods on hydraulic cylinders,push rods, fittings.
  • as rod seals for switching functions (e.g.clutch operation).
  • as rod 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 dimension only when mounted. when slipping the seal over the piston rod, it may appear too large.
  • 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.

 

function

RS03 profiles are lip seals designed  to seal pressurised space against the atmosphere;  mainly for reciprocating movements. the designis based on application in standard hydraulic systems with conventional  hydraulic oils. the operating  parameters are as defined in thesealing 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.

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 (temperature 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) 0.18 0.22 0.32 0.40 0.45 0.55
200 bar (20 MPa) 0.12 0.15 0.25 0.33 0.40 0.45
300 bar (30 MPa) 0.07 0.12 0.22 0.30 0.37 0.42
400 bar (40 MPa) 0.05 0.10 0.18 0.25 0.34 0.40

 

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 f8
ØD H10

 

mode of installation

Ød type of installation
≤ 6•cs open mounting space required
> 6•cs .....≤ 10•cs snap mounting with tool
> 10•cs snap mounting by hand

 

recommended mounting space:

 

 

 

recommended guide tolerance D1:

d f8 [mm]

p ≤ 100 [bar]

100 < p ≤ 200 [bar]

p > 200 [bar]

secondary seal

≤ 100 H10 H8 H8 H8
> 100 ≤ 200 H10 H8 H7 H8
>200 H9 H8 H7 H8

 

insertion chamfer:

in order to avoid damage  to the rod seal during installation, the piston rod 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) 2 1
(3) 3 1.5
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

 

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 6.3 4
25 ~ 49,9 ød + 10 8 5
50 ~ 149,9 ød + 15 10 7.5
150 ~ 299,9 ød + 20 14 10
300 ~ 499,9 ød + 25 17 12.5
500 ~ 699,9 ød + 30 25 15
700 ~ 1000 ød + 40 32 20
> 1000 ød + 40 32 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.

 

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