VALVE DEVICE Russian patent published in 1996 - IPC

FIELD: recovery of formation fluid from well. SUBSTANCE: valve device consists of hollow body and valve retainers. Lower part of hollow body accommodates cylinder with regulating channels. Valve device has disconnector in form of bellows or piston which forms chamber in the upper part of cylinder. The chamber is filled with compressed gas. Valve device has rod rigidly connected with its upper end to disconnector. Rod is connected with gate by means of its lower end. Gate diameter equals the disconnector diameter. Cylinder lower end has regulating channels and is rigidly connected with hollow body. Cylinder and hollow body form circular flow area. Efficient area of flow area is larger than total flow areas of regulating channels under the gate at its upper position. Upper part of the hollow body accommodates moving seat which is locked with spring units and shear screws. Body accommodates spring-loaded rod. Its lower end rigidly connected with additional gate. Installed above moving seat on the rod is bushing which is connected with flexible member. EFFECT: higher efficiency. 1 dwg