Function

Back-up rings do not have a sealing function. They are designed to prevent elastic sealing elements such as O-Rings or Quad Rings of gap extrusion. 

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

Installation

• Snap-in installation; split or unsplit