Back-Up Rings

Description

Back-up washers or Anti-extrusion rings are designed to protect o’rings and help prevent extrusion in high pressure applications by closing the clearance gap. Double acting applications (using bi-directional pressure) require the use of two back-up rings, one on either side of the o’ring.
In single acting applications (single sided pressure) where only one back-up ring is required, the back-up is located on the low pressure side of the o’ring; although it is often recommended that two back-ups be used in single acting applications to mitigate the possibility of installing the back-up on the wrong side of the o’ring.

Seal Solutions Australia stock a wide range of back-up rings to suit imperial and  metric sized o’rings. Compounds available: 90 Duro nitrile, 90 Duro Viton, Teflon and polyurethane.