Crown seals are a double acting piston squeeze-type seal. When inserted into a piston groove, the O-ring will rest on the static surface of the piston. Due to a crown seals narrow single seal, the sealing point creates a positive seal for both vacuum and high pressure applications. The crown seal side legs act as an anti-extrusion device for the O-ring and provide additional stability to the seal.

To promote the longevity of the crown seal we suggest a wear ring be used on the piston. The wear ring helps keep the piston centred which allows for even wear and pressure distribution on the crown seals sealing surface; a close tolerance wear ring will also help reduce bending of the rod.

Our standard crown seal material is Hytrel®. We stock a large amount of urethane in common sizes. The crown seal can be directly interchanged with T-seals, O-rings and quad rings. See crown seals literature for more information.