SHUTOFF VALVING DEVICE Russian patent published in 2007 - IPC F16K17/04 

FIELD: valves.

SUBSTANCE: shutoff valving device comprises actuating mechanism made of housing with movable valve and movable bushing with seat, hydraulic pump, hydraulic tank, and solenoid valve. The bushing is made of a piston. The piston is positioned in the intermediate section and separates the space of the housing into control chamber and chamber connected with the atmosphere. The device has pressure transformer, safety device, and manually operated cock. The pressure transformer is made of a housing separated into top and bottom chambers with a baffle and coaxially mounted movable differential piston with axial passage. The passage connects the above-piston space of the top chamber with the bottom chamber. The valve cooperating with the seat is mounted at the face of the differential piston. The seat is mounted at the inlet. The cross-section of the top face of the differential piston is greater than that of the valve. The safety device is composed of the housing and seat, valve, and adjusting screw with spring mounted inside the housing. The control chamber of the actuating mechanism is connected with the outlet of the hydraulic pump and inlet of the pressure transformer through the pressure line. The outlet of the pressure transformer is connected with the inlets of the solenoid valve and safety device. The outlets of the electromagnetic valve and the safety device and above-piston space of the top chamber of the pressure transformer are in communication with the hydraulic tank through the drain pipeline. The manually operated cock is interposed between the pressure and drain pipelines.

EFFECT: enhanced reliability.

1 dwg