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Piston seals with PTFE slide rings

PTFE slide rings may be preferred in applications with demands for low breakaway friction and when it comes to chemical and thermal resistance. Notches in the slide ring edges ensure rapid pressurization of the seal to react to abrupt changes in pressure. PTFE is hard and non-elastic when compared with polyurethane and rubber materials. For additional information about piston seal materials, refer to Materials.

GH profiles

GH profiles (fig. 1) have a nitrile rubber (NBR) energizer, which is an O-ring as standard. Rectangular energizers are available on request. These profiles are suitable for pressures up to 400 bar (5 800 psi) in medium to heavy duty applications. GH profiles are available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]) and some metric sizes fit seal housings in accordance with ISO 7425-1:1988. For additional information, refer to GH profile data.

APR profiles

APR profiles (fig. 2) have a nitrile rubber (NBR) O-ring energizer. The PTFE slide ring incorporates an NBR X-ring to improve sealing performance. They are suitable for pressures up to 350 bar (5 075 psi) in medium to heavy duty applications. APR profiles are available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]) and some metric sizes fit seal housings in accordance with ISO 7425-1:1988. For additional information, refer to APR profile data.
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