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piston back up ring

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Product Summary

A piston back up ring is a rigid ring that holds an elastomeric seal to its designed shape and in its correct place. Consider the problem of sealing the piston inside a pneumatic cylinder: in order to prevent leakage, a soft and flexible material is required, but the same properties may leave the seal material vulnerable to being pulled out of its seat and then pinched or torn in the (too narrow) space between piston and cylinder wall. If the joint cannot be redesigned, or a more resistant elastomer used, then the solution may be direct reinforcement with a stiffer material - in the form of a hard inner ring in this case. A second function can be to hold the elastomer in place while a machine is being assembled, as geometry may prevent the seal from being directly checked after assembly. Back up rings are commonly used with O-rings, lip seals, and (as reciprocating shaft seals.

A piston ring is an open-ended ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. The three main functions of piston rings in reciprocating engines are: Sealing the combustion/expansion chamber; Supporting heat transfer from the piston to the cylinder wall; Regulating engine oil consumption.

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