Backup rings are commonly installed with rubber o-rings to help improve their performance. These rings are designed to limit o-ring clearance gaps and are used in high-pressure sealing situations greater than 1500 PSI. Using these rings will prevent the o-ring from becoming damaged or extruded, causing failure of some systems. Generally, backup rings come in two different shapes, flat-sided and concave. The reason behind the introduction of the concave backup ring was to relieve the pressure off the o-ring as it deforms under pressure. However, there are no real performance benefits from either a flat-sided or concave backup ring.
Backup rings are used in many different industries around the globe. A few typical applications include hydraulic systems, high-pressure hydraulic systems, and high-pressure valves. In most applications, it is often best to use two backup rings, one above and one below the o-ring. This application will provide the best support for the o-ring and allow for a smooth operation.
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