Back-up ring

Back-up ring

A back-up ring is a device used in conjunction with an elastomeric seal that prevents the extrusion of the elastomer under mechanical stress or pressure into the gap being sealed. Back up rings are commonly used with O-rings, lip seals, and reciprocating shaft seals.


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  • Ring dropper — Ring Ring, n. [AS. hring, hrinc; akin to Fries. hring, D. & G. ring, OHG. ring, hring, Icel. hringr, DAn. & SW. ring; cf. Russ. krug . Cf. {Harangue}, {Rank} a row,{Rink}.] A circle, or a circular line, or anything in the form of a circular line… …   The Collaborative International Dictionary of English

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