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Xiamen Seals Technology Co.,Ltd
Address: Unit233, No.273, Lingxia North RD, Huli High technology District, Xiamen, China
Tel: +86-592-5775761
Fax: +86-592-5775761
E-mail: info@sealsmanufacturer.com

Back Up Rings

Backup Rings Seals Solution

Backup Rings Seals Solution

Back-up rings help prevent extrusion in high pressure service and compensate for loose fi tting parts. The use of loose fi tting parts makes for cost reduction in the machining of unit components....
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Backup Rings Seals Solution

Back-up rings help prevent extrusion in high pressure service and compensate for loose fi tting parts. The use of loose fi tting parts makes for cost reduction in the machining of unit components.


A back-up ring is a rigid ring that holds an elastomeric seal or plastic (such as Polyethylene) connection to its designed shape and in its correct place. Back up rings are commonly used with O-rings, lip seals, and as reciprocating shaft seals. They are also used for piping connections joining two different materials - typically one flexible and one rigid.


When sealing the piston inside a pneumatic cylinder, a soft and flexible material is required to prevent leakage, but those same properties may leave the seal material vulnerable to being pulled out of its seat and then pinched or torn in the 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.

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