Title:
VALVE DRIVING DEVICE
Document Type and Number:
Japanese Patent JPH01138303
Kind Code:
A
Abstract:
PURPOSE:To simplify the construction of a valve driving device by controlling supplying/discharging of a pressure oil to a hydraulic cylinder by means of a solenoid valve, thereby controlling both opening/closing operation of the valve and emergency opening/closing operation, by means of the hydraulic valve thus no more requiring a plurality of solenoid valves exclusively used for each operation. CONSTITUTION:Pressure oil from an oil pressure generator 11 is supplied sequently to an emergency trip unit 12, a solenoid valve 14 and a hydraulic cylinder 10, so as to drive a main steam stop valve 1. When the solenoid valve 14 is opened, the pressure oil is supplied from the emergency trip unit 12 to inlets 10b, 10d of the hydraulic cylinder 10. Then a disc dump valve 15 is pressurized to raise a piston 10c with exhaust oil passage 10a closed, and thereby the valve port 1c of the main steam stop valve 1 is released. On the other hand, when the electromagnetic valve 14 is closed, the pressure oil in the lower part of the piston 10c is discharged to a discharge oil receiving part 18 through an oriffice 16 and the solenoid valve 14, and then a valve body 1a is lowered so that the valve port 1c is closed.
Inventors:
TSUJI TOSHIO
Application Number:
JP29399287A
Publication Date:
May 31, 1989
Filing Date:
November 24, 1987
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
F01D17/10; F01D21/18; F16D21/00; F16K31/42; (IPC1-7): F01D17/10; F01D21/18; F16D21/00; F16K31/42
Attorney, Agent or Firm:
Hisano Hatano (1 person outside)
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