Back Up Rings And O-Rings - PTFE
Back-up rings in PTFE material are installed to prevent the extrusion of a rubber O-Ring in its housing groove under certain operating conditions. Two back-up rings, one on either side of the O-Ring in its housing, are needed when the application is double acting.
Back-up rings are supplied as a spiral or endless. Spirals are of two turns — this enables the back-up ring to be opened with ease for fitting over a shaft, and ensures the O-Ring is supported around its entire diameter.
Single turn back-up rings are usually endless to ensure good support. They can be scarf split if required, although this is not recommended because extrusion can occur at the split.
Back-up rings are manufactured in Polytetrafluoroethylene (PTFE) or filled PTFE, depending on the application.
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