Valves & Fittings
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Backup Rings

Reliably Prevent Gap Extrusion

Back-up rings do not have a sealing function but are used to prevent gap extrusion. They can be used in combination with O-rings or X-rings, both for static and dynamic loads. The back-up ring prevents the seal from extruding into the sealing gap and thus enables sealing of higher media pressures. Back-up rings are often used in applications with pulsating or varying pressures, such as hydraulic valves and pumps, cylinder bases and heads.

Benefits at a Glance

  • Prevent gap extrusion
  • Range of variants to fit your individual application
Backup Rings

Choose the Right Solution

Out of a Range of Product Types

  • STR END (endless) and STR GS (30° slotted) made of POM
    (temp.: -50 to +90°C) for use in mineral oils, fats and pressure media HFA, HFB, HFC
  • STR END (endless) STR GS (30° slotted) made of PTFE
    (temp.: -200 to +260°C) shows nearly universal resistance to acids, bases, alcohols, oils and pressure fluids 
  • STU (endless with concave molding) made of NBR
    (temp.: -30 to +100°C) for use in hydraulic oils, mineral-oil based lubricants, non-flammable hydraulic pressure fluids (max. +50°C) and water (max. +80°C)

Please note that resistances, pressures and temperatures are mutually influenced by various parameters.

Related Documents

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Do you have any questions? Would you like a regional expert consultation on the sealing solution that best meets your requirements? We look forward to assisting you with your inquiry.


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