| 摘要 |
PURPOSE:To eliminate a piping system running between valves, to prevent the occurrence of a fluctuation in an oil pressure during operation of a valve, and to prevent the occurrence of mulfunction, by a method wherein an oil pressure generator, consisting of a motor, a pump, and a tank, is mounted to a hydraulic cylinder adapted to drive each control valve of a steam turbine. CONSTITUTION:An oil pressure generator, formed with a motor 19, a pump 20, and a tank 18, is mounted to a hydraulic cylinder 12 of a hydraulic type valve driving device adapted to drive a main valve 11 of a turbine power plant. With the motor 19 and the pump 20 driven, working oil in the tank 18 is increased in a pressure, and is fed to a servo valve 14 and the feed oil port of an electromagnetic valve 15. During the starting of a plant, by means of a signal from a con- trol panel 5, the oil feed port and the cylinder port of a servo valve 19 are closed. By outputting an opening signal from the control panel 5, the servo valve 14 is opened, the feed oil port and the cylinder port of the valve 14 are intercommunicated, and the working oil is fed to the lower chamber of the cylinder 12 to push up the piston to open the valve 11. |
