| 摘要 |
A pressure control valve for maintaining a control pressure constant even if the flow rate of pressurized oil varies, and an oil supply apparatus adapted for a turbo machine using this pressure control valve. The pressure control valve drives a throttle valve by a hydraulic cylinder through the operation of the piston of the cylinder by a guide valve. A port is formed so as to throttle and release the oil at the input side to control the pressure at the inlet side of the valve, oil from the output side for controlling the pressure is guided to the guide valve, and the cylinder communicates with an oil pressure source through the guide valve. An oil supply apparatus which has this pressure control valve guides a pilot tube leading from the header which feeds to the load side of the guide valve, and guides the pressurized oil from the conduit between the pressurized oil supply source to the header and to the throttle valve, thereby releasing the pressurized oil to an oil tank. In this manner, the offset in the pressure control circuit becomes zero, with an extremely good response, thereby avoiding the problem of tripping of the turbo machine, and providing explosion-preventive properties only with hydraulic control.
|
