MECHANISM FOR MOTION OF BALL VALVE SEATS Russian patent published in 2001 - IPC

FIELD: valves used in piping systems. SUBSTANCE: each inlet and outlet passages of valve body is provided with bearing ring and seat. Seat is pressed to spherical valve member by group of springs. Seat motion mechanism consists of two identical parts, one for each seat. Each part is constantly located between valve body and respective seat. Each part has adjusting ring is rigidly connected with body by means of first locking member. Second ring is engageable with seat and is movable in axial direction by means of actuating member for taking the position adequate for withdrawing the valve member or working position. Second ring is fixed in working position by means of second locking member. First locking member consists of two sectors which are slidable in circular bores. First actuating member for motion of second ring and seat to required position includes varying cavity bounded by adjusting and second rings and connected with pressure by delivery and discharge passages available in adjusting ring. Second actuating member for motion of second ring and seat to working position includes second varying cavity. Second is bounded by body and second ring and is connected with pressure via delivery and discharge passages available inside valve body. Second locking member consists of two sectors slidable in circular bores. Bores are made in opposite areas of body and second ring. EFFECT: ease of maintenance. 5 cl, 3 dwg