Backup Rings

Back-up rings or Anti Extrusion Rings do not have a sealing function. They are designed to prevent elastic sealing elements of gap extrusion.

Applications

  • Dynamic and static applications in reciprocating pistons and rods in hydraulic cylinders, plungers, etc.

  • Unfavorable tolerances and wide gap dimensions. Intensely pulsating pressures and pressure change.

ST08

ST09

ST11

ST12

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ST-08

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Features

  •   Normally cut at an angle for easy installation, but also available as non-split version.
  •   Low dynamic friction.
  •   Low break-away forces after long standstills.
  •   Activated back-up rings reduce gap extrusion and prevent twisting of the seal in the groove.

Application

Dynamic and static applications in reciprocating pistons and rods in hydraulic cylinders, plungers, etc.

Unfavorable tolerances and wide gap dimensions. Intensely pulsating pressures and pressure change.

Installation

Snap-in installation; split or unsplit

ST-09

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Features

  • Especially designed for use with O-Rings.
  • Improved form stability of the elastomer O-Ring.
  • Bigger contact area of the O-Ring compared to BUR08 creates in less deformation.
  • Normally cut at an angle for easy installation, but also available as non-split version.
  • Low dynamic friction.
  • Low break-away forces after long standstills.
  • Activated back-up rings reduce gap extrusion and prevent twisting of the seal in the groove.

Application

Dynamic and static applications in reciprocating pistons and rods in hydraulic cylinders, plungers, etc.

Unfavorable tolerances and wide gap dimensions. Intensely pulsating pressures and pressure change.

Installation

Snap-in installation

ST-11

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Features

  • Active Anti Extrusion Ring for Rod Seal RS-02.
  • Reduced gap extrusion of the elastomer seal and/or  higher pressures up to 700bar possible.
  • Prevention of twisting of the seal in the groove.
  • Available as split non-split version.

Application

Dynamic and static applications in reciprocating pistons and rods in hydraulic cylinders, plungers, etc.

Unfavorable tolerances and wide gap  dimensions.

Installation

Snap-in installation

ST-12

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Features

  • Triangular Anti Extrusion Ring for Rod applications
  • Special housing designs required.
  • Reduced gap extrusion of the elastomer seal and/or higher pressures up to 700bar possible.
  • Available as split and non-split version.

Application

Dynamic and static applications in reciprocating rods in hydraulic cylinders, plungers, etc. Unfavorable tolerances and wide gap dimensions.

Installation

Snap-in installation

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)