TRIPLE SEALING SEAT WITH GAS FLUSHING FOR A CONDUIT GATE VALVE

摘要

A triple sealing seat 10 is proposed which is provided in a conduit gate valve having at least one shut-off plate which is displaceable between an open and closed position with respect to the conduit, wherein the triple sealing seat 10 forms a substantially annular sealing surface 11. In order to increase the tightness, the annular sealing surface 11 comprises a radial interior sealing and scraping edge 12 which can be contacted with the shut-off plate during operation, as well as a first circumferential groove 13a located radially further outside which is in communication with a first gas channel 14a and to which a sealing gas pressure can be applied, as well as a second circumferential groove 13b located radially further outside which is in communication with a second gas channel 14b and to which a sealing gas pressure can be applied. Moreover are proposed a single-plate gate valve and a double-plate gate valve comprising the inventive triple sealing seat 10, as well as a method for sealing a shut-off plate of a conduit gate valve by means of the inventive triple sealing seat 10.

主权项

1. Triple sealing seat (10) for a conduit gate valve having at least one shut-off plate which is displaceable between an open and closed position with respect to the conduit, wherein the triple sealing seat (10) forms a substantially annular sealing surface (11), and wherein the annular sealing surface (11) comprises a radial interior sealing and scraping edge (12) which can be contacted with the shut-off plate during operation, as well as a first circumferential groove (13a) located radially further outside which is in communication with a first gas channel (14a) and to which a sealing gas pressure can be applied, as well as a second circumferential groove (13b) located radially further outside which is in communication with a second gas channel (14b) and to which a sealing gas pressure can be applied.