A backup ring is a non-sealing component that supports and prevents extrusion of hydraulic/pneumatic seals under high pressure.
A backup ring is an annular component installed adjacent to a primary seal (such as an O-ring or U-cup) in hydraulic or pneumatic systems. Its primary function is to provide mechanical support to the seal, preventing it from extruding into the clearance gap between mating parts under high pressure, extreme temperature fluctuations, or dynamic conditions. This extends seal life and maintains system integrity by ensuring the seal remains properly positioned and functional.
诱因 → 失效模式 → 工程缓解
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Backup rings are essential in high-pressure systems (typically above 150 bar), with large clearance gaps, under extreme temperature swings, or in dynamic applications to prevent seal failure.
Primarily used with elastomeric seals like O-rings, U-cups, and rod seals; not typically needed with metal seals or self-supporting designs.
Choose based on operating conditions: PTFE for chemical/thermal resistance, Nylon for cost-effectiveness, PEEK for high temperatures, and consider filled composites for wear resistance.
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