Back-up Rings for Oil & Gas Applications - Trelleborg

Back-up Rings

  • Prevents O-Ring extrusion
  • Prolongs O-Ring service life
  • Allows O-Rings to be utilized in higher pressure applications, where larger extrusion gaps are required and where there are reciprocating or rotating movements
  • Compatible with virtually all media and gases
  • Easy installation
  • Wide range of geometries to meet the needs of all applications
  • Sizes to meet all standards
  • Non-standard sizes also available

Back-up Rings are protective and supporting elements with no sealing function. Made from extrusion-resistant materials such as Turcon®, Zurcon®, Hi-Mod® or PEEK they usually have a rectangular cross section and are installed in a groove with an elastomer O-Ring. Due to their tight fit in the housing, Back-up Rings prevent extrusion of the pressurized elastomer sealing element into the clearance or extrusion gap.

Applications

Using Back-up Rings allows O-Rings to be utilized in higher pressure applications, where larger extrusion gaps are required and where there are reciprocating or rotating movements. They also compensate for large temperature fluctuations.

Technical Data

Parameters Values

Operating Pressure

40 MPa / 5,800 psi

Speed

2 m/s / 6.5 ft/s

Temperature Range

-200 °C to +260 °C / -392 °F to +500 °F

Clearance

As per ISO 3601

Media

Compatible with virtually all media and gases