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Piston seals

Piston seals (fig. 1) maintain sealing contact between the piston and the cylinder bore. Differential pressures acting on the piston to extend or retract the piston rod can be in excess of 400 bar (5 800 psi). The pressure acting on the piston seal increases contact forces between the piston seal and cylinder surface. Therefore, the surface properties of the sealing surfaces are critical to proper seal performance (→ Counter-surface finish properties).

Piston seals are typically classified into single-acting (pressure acting on one side only) and double-acting (pressure acting on both sides) seals.

Double-acting piston seals

ProfileDescription
MPV

Polyurethane slide ring, nitrile rubber energizer; suitable for medium to heavy duty applications
Additional information
Profile data
Size list metric [pdf]
DPV

Polyurethane slide ring, nitrile rubber energizer; fits O-ring dash-number housings; suitable for medium to heavy duty applications
Additional information
Profile data
Size list inch [pdf]
LPV

Polyether-based polyurethane slide ring, nitrile rubber energizer; suitable for light to medium duty applications
Additional information
Profile data
Size list metric [pdf]
CPV

Polyurethane slide ring, nitrile rubber energizer; fits O-ring dash-number housings; suitable for light to medium duty applications
Additional information
Profile data
Size list inch [pdf]
GH

PTFE slide ring, nitrile rubber energizer; low breakaway friction; suitable for medium duty applications
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
APR

PTFE slide ring with incorporated nitrile rubber X-ring for improved sealing performance, nitrile rubber energizer; suitable for medium to heavy duty applications
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
LCP

PTFE slide ring supported by polyamide anti-extrusion rings, nitrile rubber energizer; very good gap extrusion resistance; suitable for heavy duty applications and high pressures
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
LTP

Sealing ring made of nitrile rubber, supported by polyamide anti-extrusion rings; good gap extrusion resistance; fits O-ring dash-number housings; suitable for medium to heavy duty applications and high pressures
Additional information
Profile data
Size list inch [pdf]
CUT

Step cut polyamide slide ring, nitrile rubber energizer; suitable for heavy duty applications and high pressures
Additional information
Profile data
Size list metric [pdf]
SCP

Step cut polyamide slide ring, oval nitrile rubber energizer; fits wide, shallow inch size housings; suitable for heavy duty applications and high pressures
Additional information
Profile data
Size list inch [pdf]
MD-L

Five-piece compact set consisting of a nitrile rubber sealing ring, integrated polyester elastomer anti-extrusion rings and polyacetal guide rings; suitable for medium duty applications
Additional information
Profile data
Size list metric [pdf]

Single-acting piston seals

ProfileDescription
UNP

Polyurethane U-cup profile; single-acting; may be used in double-acting cylinders when using two seals in back-to-back arrangement; suitable for medium duty applications
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]

Rod seals that can be used as piston seals

These rod seal profiles are designed with similar inside and outside sealing geometry. Therefore, they can also be used as piston seals (→ Rod seals used as single-acting piston seals).

ProfileDescription
PTB

Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
STD

Additional information
Profile data
Size list inch [pdf]
DZ

Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
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