GATE VALVE Russian patent published in 2004 - IPC

FIELD: oil and chemical engineering. SUBSTANCE: invention is designed for use as shutoff device in pipelines. Proposed gate valve has housing consisting of two parts, with spacer ring rigidly secured in between disk gate with through channel is installed in inner space of spacer ring for turning on its axle in its plane within the limits of adjusting zone. Said gate forms closed periphery space with spacer ring and engages with support surfaces of housing through thrust bearings in form of contour sealing members. Through hole, diameter from 0.02 to 0.05 of through channel diameter from 0.02 to 0.05 of through channel diameter is made in disk gate in parallel with its axis on radius equal to radius of location of through channel in center of adjusting zone. Said hole is connected by radial hole with closed periphery space. The latter communicates with atmosphere through normally closed hole made in one of housing parts. Thrust bearings in form of contour sealing members are interference fitted in each part of housing. EFFECT: increased operation reliability and service life till first repair. 3 dwg