VALVE AND STEM SEAL THEREFOR

摘要

A valve having a valve member with a stem connected to an actuator and an improved stem seal for sealing between the stem and the interior of the body on a bonnet attached thereto. The improved stem sealing assembly includes a U-shaped resilient seal ring with means in its open end to ensure sealing engagement of the multiple internal and external sealing lips with the stem and body sealing surfaces and support rings positioned in grooves between the sealing lips and anti-extrusion means engaging the closed end of the seal ring to prevent extrusion of the seal ring. A modified sealing assembly also includes a back-up seal and anti-extru-sion means therefor.