description
two-piece double wiper consisting of dynamic wiper ring and a static O-ring.
- the seal profile and close machining tolerances provide a good static seal for the outside diameter, assisting in the prevention of ingress of humidity and foreign matter via the trailing side.
- the use of plastic for the retaining ring prevents corrosion in the seat.
- an interference fit on the outside diameter ensures the wipers are held in place
and also prevent humidity and foreign matter from entering via the outside
diameter.
- this profile is not suited for pressure from the trailing side.
application
not bolded symbols; please consult our technical for application limitations
category of profile
machined or molded/standard/trade product.
single acting
area of application: hydraulics
hydraulic systems, reciprocal movements, medium dirt load.
function:
the WR 13 is a double function wiper with a sharp wiping edge, a sealing lip on the medium side and an O-ring as a energizing element. this double function consists of wiping the dirt from the surface of the descending piston rod on the one hand and on the other, that the remaining oil film is retained and returned to the system with the next descent. the high wear resistance of the polyurethane provides this wiper with a particularly long service life.
media
hydraulic oils acc. to DIN 51524/51525, lubricating oils, other mineral oil based fluids and HFA, HFB, HFC highly non-flammable hydraulic fluids acc. to VDMA 24317.
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.
mode of installation
the prerequisites for perfect functioning are careful fitting and an accurately dimensioned mounting space. in general, wipers snap easily into their housings when distorted into a kidney shape (over 20mm diameter). a large insertion chamfer must be provided (20-30°, length
= (D-d)/4).
surface quality
| surface roughness |
Rtmax (μm) |
Ra (μm) |
| sliding surface | according to seal data | |
| bottom of groove | ≤6,3 | ≤1,6 |
| groove face | ≤15 | ≤3 |
tolerance recommendation
| seal housing | tolerances |
| L | +0,2 |
| 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.