Back-up ring for Grove SIE-335/15

The back-up ring is an auxiliary component designed to function alongside an O-ring within hydraulic or pneumatic sealing systems. Its primary role is to provide mechanical support to the O-ring, preventing it from being forced into the gap between mating surfaces when the system is subjected to high pressure. By maintaining the O-ring in its proper position and shape, this component ensures the integrity of the seal and prevents fluid leakage.

This part is specifically intended for use in Grove SIE-335/15 cranes. These heavy lifting machines rely on high-pressure hydraulic circuits where seals must withstand significant forces to maintain operational pressure. Correct installation of the back-up ring is necessary to prevent the O-ring from deforming under these loads.

In general engineering, back-up rings are used in systems where pressure levels exceed the standard rating of an O-ring alone. They are typically installed on the low-pressure side of the O-ring. When the system is pressurized, the back-up ring fills the clearance gap, providing a rigid surface that stops the softer O-ring material from extruding. This configuration is standard in hydraulic cylinders, valves, and other fluid power components to ensure consistent sealing performance under demanding operating conditions.