BACK-UP RINGS

DESCRIPTION

KRS produces Backup rings that are designed to keep O-Rings from extruding as well as Backup rings for U-Cups applications. 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.

Back-up rings are used in Polyethylene (PE) pipe connections, such as HDPE pipes, where they are connected to steel pipe or pipe fittings. 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.

MORE INFO

Back-up rings are used in Polyethylene (PE) pipe connections, such as HDPE pipes, where they are connected to steel pipe or pipe fittings. Pipeline Flange Adapter and Back-up Ring connection HDPE to steel pipe the back-up ring is matched to the steel pipe flange specification and is placed behind the HDPE flange adapter - an end piece on the HDPE pipe that looks much like a steel flange at the end of the HDPE pipe.