VALVING AND CONTROLLING DEVICE Russian patent published in 1996 - IPC

FIELD: valving. SUBSTANCE: major and additional disk rotatable slides are interposed between the seats inside a housing. The slides are blocked together in the axis of the flow. The slides are provided with openings and springs for pressing out of the major and additional disks, respectively. There are cylindrical projections over periphery of the disks. The projections are received in sockets made in the slides. A pressing out bearing is interposed between the sealing disk and seat of the outlet branch pipe. A thrust bearing is interposed between the additional disk and respective seat. The thrust bearing forms a slot space to connect the delivery fluid with the slide space through the seat openings. The driving lever is provided with axial and lateral passageways and space provided with piston with a by-pass and spring-loaded plunger. The plunger is mounted inside the axial passageway for permitting interaction with the piston. The passage for discharging fluid and segment groove are made in the housing. A spring-loaded insert with a check valve is received in the segment groove. The valve is mounted for permitting overlapping of the lateral passageway. The radial passageway of the major slide is connected with the central socket. The lever space is provided with a groove for flowing the fluid at a moment when the pressure at the slide is decreased and the lever moves from the "closed" position to the "partially open" position. EFFECT: enhanced reliability. 3 dwg