It is used in the valve seat of the normal temperature pump valve which is composed of filled PTFE and alloy spring. There is a T-shaped support ring to protect the lip from being damaged when the system has reverse pressure. Destruction, the common temperature range is -50℃~150℃, and the normal working pressure can reach to 2500LB. It is necessary to add a back-up ring on the back to prevent extrusion when the pressure go higher.