WELLHEAD DOUBLE-BALL COCK Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to wellhead equipment. Proposed cock has body with central hole and valve chamber. Two ball members with journals are installed coaxially inside chamber. Fixing split rings are arranged in corresponding ring bores of body. Two seats are provided, one being fitted in ring bore of body. Each ball member is installed in support split bushing with holes for journals and is provided with ball member turning limiter. Support split bushings are arranged for engagement with corresponding fixing split rings through adjusting rings, threaded bushings mated with nuts whose outer ring groove is in contact with fixing split rings, thus forming a common unit. Seats are spring-loaded, three of the seats being installed in threaded bushings. Threaded bushings are made with equal inner diameter for mounting of seats to diameter of body bore for mounting of seat. EFFECT: provision of high reliability and sealing. 3 cl, 2 dwg