GATE VALVE WITH FLOATING SEAL

摘要

A valve stem-plug and seal assembly includes a valve stem-plug having first and second axially spaced peripheral shoulders forming a groove there between. A floating seal gasket is arranged in the groove. The floating seal gasket is an annular ring with a central opening through which the valve stem-plug extends. Further, the outer surface of the floating seal gasket includes an upper and a lower circumferential extending segment, wherein the segments are arranged for sealing against a valve seat and thereby forming a double-contact seal. The outer surface of the floating seal is concave between the upper and lower circumferentially extending segments such that a leakage chamber is formed between the valve seat and said upper and lower circumferentially extending segments when the double-contact seal is formed. The floating seal gasket itself and a valve assembly in which the valve stem-plug and seal assembly is used are also disclosed.

主权项

1. A valve stem-plug and seal assembly comprising:
a valve stem-plug having first and second axially spaced peripheral shoulders forming a groove there between; and a floating seal gasket arranged in said groove, wherein the floating seal gasket is an annular ring with a central opening through which the valve stem-plug extends, wherein an outer surface of the floating seal gasket comprises an upper and a lower circumferential extending segment, said upper and lower circumferential extending segments being arranged for sealing against a valve seat and thereby forming a double-contact seal, and wherein the outer surface of the floating seal is concave between said upper and lower circumferentially extending segments such that a leakage chamber is formed between the valve seat and said upper and lower circumferentially extending segments when said double-contact seal is formed.