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Back-up Rings

Back-up Rings

Back-up rings are rigid, ring-shaped components used alongside O-rings to prevent extrusion and damage of the O-ring under high pressure or in applications with large gap tolerances. While they do not seal by themselves, they are essential in supporting the O-ring to maintain seal integrity and prolong its lifespan.


Product Detail

Purpose:
  • ● Prevent the O-ring from being forced into the gap between mating parts (extrusion).
  • ● Provide mechanical support to the O-ring in high-pressure or dynamic environments.
  • ● Maintain sealing performance under varying loads and temperatures.

Materials:
  • ● PTFE (Teflon) – chemically resistant, handles wide temperature ranges.
  • ● Nylon – strong and slightly flexible; often used in hydraulic systems.
  • ● POM (Acetal) – hard, wear-resistant, and dimensionally stable.
  • ● Rubber-reinforced polymers – for special dynamic or low-temperature applications.

Types:

  • ● Solid (Unsplit) – used in open grooves; must be installed during assembly.
  • ● Split (Slit) – can be installed in closed grooves; easier to handle during maintenance.
  • ● Spiral – flexible and easy to install; common in retrofit situations.

Applications:

  • ● Hydraulic and pneumatic cylinders
  • ● High-pressure valves and pumps
  • ● Oil & gas systems
  • ● Aerospace and automotive components
  • ● Heavy industrial machinery

Advantages:

  • ● Prevents seal failure due to extrusion
  • ● Extends O-ring service life
  • ● Enables sealing at higher pressures
  • ● Improves overall system reliability

Back-up rings are vital in critical sealing systems where high pressure, large clearances, or dynamic forces are present. They enhance O-ring performance by reinforcing the seal and preventing damage during operation.


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