Piston Seals

We custom make Piston Seals

Eighteen standard profiles are available.  We can also modify profiles to meet your specific requirements.  Choose the profile you require and a description of that seal is provided.

K01-P

K02-P

K02-PD

K02-R

K02-RD

K03-P

K04-PD

K05-P

K05-R

K06-P

K06-R

K07-P

K08-D

K08-E

K08-P

K16-A

K17-R

K19-F

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K01-P

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Function
Piston seals are designed to seal the pressurized hydraulic fluid against the atmosphere or between two pressurized spaces.

Features
 Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groove.
 Dynamic sealing lip shorter than static lip to avoid drag pressure.
 Excellent static and dynamic sealing performance.
 Useable for long stroke lengths.
 Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.
 For lower speeds the dynamic lip should be redesigned (shorter, stiffer).

Application
Reciprocating pistons in hydraulic cylinders, plungers.
Universal piston seal for small extrusion gaps and minor load impacts. Max. pressure 400 bar, max. speed 0.5 m/s.

Installation
Snap-in installation

K02-P

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Features

  • Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groov
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Excellent static and dynamic sealing performance.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.
  • For lower speeds the dynamic lip should be redesigned (shorter, stiffer).
  • Activated back-up rings prevent and reduce gap extrusi

Application

Reciprocating pistons in hydraulic cylinders, plungers.

Universal piston seal for small extrusion gaps and minor load impacts. Max. pressure 700 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K02-PD

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Features

Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groove.

Dynamic sealing lip shorter than static lip to avoid drag pressure.

Excellent static and dynamic sealing performance.

Useable for long stroke lengths.

Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.

For lower speeds the dynamic lip should be redesigned (shorter, stiffer).

Activated back-up rings prevent and reduce gap extrusion.

Application

Reciprocating pistons in hydraulic cylinders, plungers.

Universal piston seal for small extrusion gaps and minor load impacts. Max. pressure 700 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K02-R

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mm's
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Features

  • Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groov
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Excellent static and dynamic sealing performance.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.
  • For lower speeds the dynamic lip should be redesigned (shorter, stiffer).
  • Activated back-up rings prevent and reduce gap extrusion.

Application

Reciprocating pistons in hydraulic cylinders, plungers.

Universal piston seal for small extrusion gaps and minor load impacts. Max. pressure 700 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K02-RD

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Features

  • Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groove
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Excellent static and dynamic sealing performance.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.
  • For lower speeds the dynamic lip should be redesigned (shorter, stiffer).
  • Activated back-up rings prevent and reduce gap extrusion.

Application

Reciprocating pistons in hydraulic cylinders, plungers.

Universal piston seal for small extrusion gaps and minor load impacts. Max. pressure 700 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K03-P

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Features

  • Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groove.
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Increased preload due to an additional O-Ring.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in all pressure ranges.
  • Used for short, pulsating strokes.
  • No reverse leakage when changing direction.
  • Recommended for positioning or holding under pressure.

Application

Reciprocating pistons in hydraulic cylinders, plungers, push rods, fittings, etc. Switching or clamping functions.

Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K04-PD

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Features

  • Asymmetrical, single acting piston seal, designed with interference on the ID which provides a good static fit in the groove.
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Increased preload due to an additional O-Ring.
  • Activated back-up ring prevents and reduces gap extrusion.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in all pressure ranges.
  • Used for short, pulsating strokes.
  • No reverse leakage when changing direction
  • Recommended for positioning or holding under pressure.

Application

Reciprocating pistons in hydraulic cylinders, plungers, push rods, fittings, etc. Switching or clamping functions

Max. pressure 700 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K05-P

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Features

  • Asymmetrical, single acting piston seal for pneumatic applications, designed with interference on the ID which provides a good static fit in the groove.
  • Special designed sealing lip to retain the lubrication film and prevent dry running.
  • Excellent static and dynamic sealing performance.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip”, small break-away loads after long standstill.

Application

Reciprocating pistons in pneumatic cylinders, suitable for dry and lubricated air. Universal piston seal for small extrusion gaps and minor load impacts.

Max. pressure 25 bar, max. speed 1 m/s.

Installation

Snap-in installation.

K05-R

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Features

  Symmetrical, single acting piston/rod seal, no interference on the ID or OD.

  Special design with wider groove for large cross sections.

  Excellent static and dynamic sealing performance.

  Excellent performance in low pressure conditions.

  Useable for long stroke lengths.

  Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc.

Universal piston / rod seal for small extrusion gaps and minor workloads. Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K06-P

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mm's
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Features

  • Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in low pressure conditions.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc.

Universal piston / rod seal for small extrusion gaps and minor workloads. Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K06-R

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mm's
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Features

  • Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in low pressure conditions.
  • Useable for long stroke lengths.
  • Negligible tendency to “stick-slip” effect above a speed of 0.15 m/s.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc.

Universal piston / rod seal for small extrusion gaps and minor workloads. Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K07-P

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mm's
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Features

  • Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
  • Increased preload due to an additional O-Ring.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in low pressure conditions.
  • Used for short pulsating strokes.
  • No reverse leakage when changing direction.
  • Recommended for positioning or holding under pressure.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc. Switching or clamping functions.

Replacement for rubber fabric seals.

Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

K08-D

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Features

  • Asymmetrical, single acting piston seal, designed with interference of the O-Ring on the ID and slight interference of the PTFE glide ring on the OD.
  • Excellent sealing performance in low and high speeds.
  • Suitable for positioning functions.
  • Negligible tendency to “stick-slip” effect, good sliding properties.
  • Low break-away load after long standstills.
  • Excellent gap extrusion resistance due  to the free space on the trailing side.

Application

Reciprocating pistons in hydraulic cylinders, plungers. Dynamic seals in hydraulic systems.

Tandem arrangement possible.

Max. pressure 400 bar, max. speed 15 m/s.

Installation

Snap-in installation.

Attention: PTFE glide rings needs calibration after installation!

K08-E

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Features

  • Asymmetrical, single acting piston seal, designed with interference of the O-Ring on the ID and slight interference of the PTFE glide ring on the OD.
  • Excellent sealing performance in low and high speeds.
  • Suitable for positioning functions.
  • Negligible tendency to “stick-slip” effect, good sliding properties.
  • Low break-away load after long standstills.
  • Excellent gap extrusion resistance due  to the free space on the trailing side.

Application

Reciprocating pistons in hydraulic cylinders, plungers. Dynamic seals in hydraulic systems.

Tandem arrangement possible.

Max. pressure 400 bar, max. speed 15 m/s.

Installation

Snap-in installation.

Attention: PTFE glide rings needs calibration after installation!

K08-P

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Features

  • Asymmetrical, double acting piston seal, designed with interference of the O-Ring on the ID and slight interference of the glide ring on the OD.
  • Glide ring in very wear resistant hard grade polyurethane (PU-D57).
  • Excellent sealing performance in low and high speeds.
  • Suitable for positioning and holding functions.
  • Negligible tendency to “stick-slip” effect.
  • Low break-away load after long standstills.
  • Good gap extrusion resistance.

Application

Reciprocating pistons in hydraulic cylinders, plungers. Dynamic seals in hydraulic systems.

Max. pressure 250 bar, max. speed 1 m/s

Installation

Snap-in installation.

K16-A

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Features

  • Asymmetrical, single acting piston seal.
  • Long sealing lip compensates for radial inaccuracy or eccentricity.
  • Useable for long stroke lengths.
  • Low break-away load after long standstills.
  • Seal design tends to “stick-slip” effect.

Application

Reciprocating pistons in hydraulic and pneumatic cylinders. Replacement for seal designs (leather seals etc.) used in old cylinders. Max. pressure 160 bar, max. speed 0.5 m/s.

Installation

Clamped by flange.

K17-R

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Features

  • Double acting piston seal, designed with interference on the ID which provides a good static fit in the gr
  • Consisting of one sealing and two guiding/back-up element
  • Useable for short and long stroke lengths.
  • Good dynamic and static sealing perform
  • High frictional force.

Application

Reciprocating pistons in hydraulic cylinders. Universal piston seal for double-acting cylinders.

Max. pressure 400 bar, max. speed 0.5 m/s.

Installation

Snap-in installation.

Recommended for cross sections up to approx. 10mm.

K19-F

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Features

  • Asymmetrical, single acting piston seal, designed with no interference on the static sealing diameter.
  • Preload effected through V-spring.
  • Dynamic sealing lip shorter than static lip to avoid drag pressure.
  • Excellent static and dynamic sealing performance.
  • Useable for short and long stroke lengths.
  • Low friction in dry running or poor lubrication conditions.
  • Negligible tendency to “stick-slip” effect, small break away loads.

Application

Reciprocating and swiveling pistons in hydraulic cylinders, plungers. 

Chemical and pharmaceutical industry, aggressive fluids and high temp. 

Max. pressure 160 bar, max. speed 15 m/s.

Installation

Installation in open housing, snap-in installation possible in special designed housings.

S1012-M

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Features

  • Symmetrical, single acting piston/rod seal, combined with pressure ring and support ring.
  • By adjusting the number of packings friction and leakage characteristics can be influenced.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in high pressure conditions.
  • Useable for short and long stroke lengths.
  • High wear resistance.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc.

Used in heavy duty applications (presses) with return stroke by equipment weight. Max. pressure 500 bar, max. speed 0.5 m/s.

Installation

Installation normally in open housings.

At closed housings the parts need to be split. In this case the seal must be done  slightly larger (approx. 1% in diameter)