Parback Rings
Parback Rings are usually made from Nitrile, Viton or P.T.F.E. and are used to stop the migration of the o ring into the sealing gap under pressure, one side will usually be contoured to enhance a snug fit.
Back-up rings (anti-extrusion rings)are fitted to prevent the extrusion of o rings and quad rings (x rings) under extreme pressure. Back-up rings are generally fitted where the system pressure exceeds 1500PSI. The o ring groove has to be enlarged to accommodate the back- up ring…
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