AntiExtrusionEinsätze

AntiExtrusionEinsätze, often translated as anti-extrusion inserts or back-up rings, are mechanical components used in hydraulic and pneumatic systems to prevent the extrusion of seals. Seals, typically made of elastomeric materials like rubber, can be forced into the clearance gap between moving and stationary parts under high pressure. This phenomenon, known as extrusion, can lead to seal damage, leakage, and premature system failure. AntiExtrusionEinsätze are designed to fill this gap and provide a rigid support that prevents the seal from deforming into the void.

These inserts are commonly manufactured from harder, non-extrudable materials such as PTFE, nylon, or acetal. Their design often involves a specific shape, such as a crescent or a full ring, that complements the seal and the groove it occupies. The precise dimensions and material selection depend on factors like operating pressure, temperature, fluid type, and the specific seal profile being protected. When properly installed, the anti-extrusion insert takes the load that would otherwise cause the seal to extrude, thereby extending the seal's lifespan and maintaining the integrity of the system. They are a crucial element in achieving reliable performance in high-pressure applications.