WELL CUT-OFF VALVE Russian patent published in 1994 - IPC

FIELD: valving. SUBSTANCE: valve has cylindrical case provided with a valving unit made of two disks mounted one above another and having the same number of coaxial passages and mechanism of controlling the valving unit made of cylinder with piston and spring- loaded rod with a through axial passage. The top disk is rigidly secured within the case and its passages are provided with check valves. The bottom disk is mounted for rotation about its axis that allows to coincide the openings of both disks. The disks are provided with a unit for controlling axial forces, and the control mechanism is provided with flexible separators which form hydraulically interconnected chambers at its top and bottom parts. The rod is kinematically connected to the bottom disk and mounted for engaging with the piston. EFFECT: expanded functional capabilities. 4 cl, 2 dwg