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 rod sealing set consisting of several chevrons, combined with pressure and support ring to form a set.
- various materials are available for different purposes.
- good sealing in the higher pressure range.
- due to the strong trailing side suitable for pressures up to 600 bar as a seal be-tween pressurized space and atmosphere.
- 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).
- the sealing packing can be used both as a rod seal and single-acting piston seal.
- by varying the number of packings,friction as well as leakage behavior can beinfluenced.
- mainly used for repair purposes.use more modern systems for new designs.
- friction is less than with the RS1012 type,but greater than with more modernsealing systems (RS09-B and RS01 combination). the mechanical efficiency of thispacking 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 RS13-15 seal is designed for use as a rod seal.
area of application: hydraulics
- linearly acting rods on hydraulic cylinders; small swiveling motion also permissible. especially for heavy hydraulic applications or heavy-duty operating conditions and in the case of tread wear.
- 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.
- split repair version is not possible.
function
RS13-15 profiles are single-acting rod seal sets designed to seal pressurised space against the atmosphere; mainly for reciprocating move- ments. 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(max. pressure=500 bar (50 MPa))
| material | temperature°C | speed | hydrolysis | dry running | wear resistance | ||
| header ring RS10 | sealing element RS11 | back-up ring RS12 | |||||
| POM /PA | PU | POM /PA | -30 °C … +100 | 0,5 m/s | – | + | + |
| POM /PA | HPU | POM /PA | -20 °C … +100 | 0,5 m/s | + | + | + |
| POM /PA | LTPU | POM /PA | -40 °C … +100 | 0,5 m/s | – | + | + |
| POM /PA | SPU | POM /PA | -20 °C … +100 | 0,7 m/s | + | + | + |
| POM /PA | CHPU | POM /PA | -30 °C … +100 | 0,5 m/s | + | + | + |
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 rod and housing should not exceed cs·0.05.
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) | 3.0 |
| 7.5 | 3.5 |
| 10 | 5.0 |
| 12.5 | 6.0 |
| 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.
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
insert the male ring first, then the packing and finally the pressure ring (well greased) into the installation space. insert the metal insert without load, complete mounting of the system, tighten metal inserts slightly, let run in (10 to 20 idle strokes); re-tighten depending on leakage. in the case of wear, re-tightening is also possible.
if split seals are used, the packing should be fitted by separating the split ends axially (twisting). joints should be staggered by 90 to 120 degrees relative to each other. split ends should be inserted into the groove first and then the remainder of the seal is pressed in.
recommended mounting space:
the adjustment range of the mounting space height (L) should correspond to approx. 10% of the theoretical mounting length. a guideline for the height of the spacer should be approx. 30% of the cross section.
recommended guide tolerance D1:
| d f8 [mm] |
p ≤ 100 [bar] |
100 < p ≤ 200 [bar] |
p > 200 [bar] |
| ≤ 100 | H10 | H8 | H8 |
| > 100 ≤ 200 | H10 | H8 | H7 |
| >200 | H9 | H8 | H7 |
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 | |
| 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 should be in accordance with following recommendations (see also manufacturing notes)
| Ød [mm] | ØD [mm] | L [mm] | cs = (ØD – Ød)/2 [mm] |
| 10 – 39,9 | ød + 10 | 16 | 5 |
| 40 – 74,9 | ød + 15 | 25 | 7.5 |
| 75 – 149,9 | ød + 20 | 32 | 10 |
| 150 – 199,9 | ød + 25 | 40 | 12.5 |
| 200 – 300 | ød + 30 | 50 | 15 |
| > 300 | ød + 40 | 63 | 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.