description
with groove on inside diameter, for piston application. split and non split design avail- able.
the guide ring type BWR 07 is mainly used on pistons. it provides guiding and bearing sur- faces between piston and cylinder tube and prevents metal to metal contact between them.
the BWR 07 consists of an extremely abrasion-resistant and low-friction POM-PTFE-Bronze compound and other materials. it can be used for hydraulic oil with a mineral oil base, for water-oil emulsions and for fire-resistant fluids as well as compressed air.
it has a U-shaped cross-section and is split with an angled butt joint. it can be easily expanded for fitting into corresponding installation grooves on the piston. the U- shaped groove arrangement secures the bearing against axial movement.
application
not bolded symbols; please consult our technical for application limitations
category of profile
machined product only.
operating parameters & material
| material | temperature | max. surface speed | max. specific load |
| POM | -50 °C … +100 °C | 4,0 m/s | 25 N/mm2 |
| PA | -40 °C … +100 °C | 4,0 m/s | 25 N/mm2 |
| PTFE glass | -200 °C … +200 °C | 4,0 m/s | 3 N/mm2 |
| PTFE bronze | -200 °C … +200 °C | 5,0 m/s | 4,5 N/mm2 |
| Phenolic Resin | -40 °C … +130 °C | 1,0 m/s | 90 N/mm2 |
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.
2 POM up to ø260 mm, PA above ø260 mm
tolerance recommendation
| seal housing | tolerances |
| Ød | h10 |
| Ød1 | h8 |
| ØD | H9 |
surface quality
| surface roughness |
Rtmax (μm) |
Ra (μm) |
| sliding surface | ≤1,5 | 0,3 – 0,5 |
| bottom of groove | ≤6,3 | 0.8 |
| groove face | ≤15 | ≤3.2 |
fitting & installation
split bearing ring F07 to be snapped onto the piston.
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.