The main function of a Backup Ring is to reduce up an extrusion gap in a seal housing and prevent the main seal from being forced out of the gap which can damage and finally failure of the main seal. Backup Rings are basically manufactured from extrusion-resistant high modulus materials which makes them able to withstand higher pressures than their partnering seal. This then allows seals for the use of a lower hardness material to provide better low-pressure sealing capability.
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