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Contoured backup rings were primarily developed for use with petroleum-based hydraulic fluids. The standard material utilized is 90 durometer nitrile, which facilitates easy installation.
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O-rings require back-ups for both static and dynamic sealing applications. If pressure is applied on one side, one back-up is needed on the opposite side. If pressure is applied on both sides, two back-ups are required, one for each side.
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Spiral designs adjust to bridge the extrusion gap and accommodate large temperature variations and tolerances..
- Made from PTFE Only
- Easy installation
- For reciprocating movements only
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Back-up rings are used with the primary seal for piston and rod.
Back-up rings enhance extrusion resistance and protect seals from damage.
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Back-up rings enhance extrusion resistance and protect seals from damage in high pressure, larger gaps, and elevated temperatures.
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Keystone shape back-up rings used with the primary seal for piston and rod special applications to provide better stability.
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3.2
Ultra-High Pressure Back-up Rings
Positively activated back-up rings are designed to prevent extrusion and accommodate cylinder tube expansion under ultra-high pressures. They bridge the radial gap between the piston and bore as pressure increases, sliding along their angle to close metal gland clearance gaps.
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External Back-up Ring
Positively activated back-up ring backing up on triangular faces to prevent external seal extrusion.
