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  • Back up Ring: The Unsung Hero of Sealing Systems
    • December 05. 2025

    In hydraulic and pneumatic seals, main seals such as O-rings receive much attention, but their performance relies on an often overlooked component: the back up ring.   What is a Back up Ring? A back up ring is a rigid ring installed next to the seal to prevent it from being squeezed into the metal gap under high pressure. Back up rings are essential when system pressu...

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