Fluid pressure control device

A fluid pressure control device disposed between a fluid supply source and a fluid actuator, and configured to transition from a normal mode in which a fluid pressure supplied to the fluid actuator is set to an operating pressure, to a standby mode in which the fluid pressure is set to a standby pressure that is lower than the operating pressure, the fluid pressure control device comprising:

• an inlet port connected to the fluid supply source;
• an outlet port connected to the fluid actuator;
• a supply valve configured to adjust an area of a flow path connecting the inlet port and the outlet port;
• and
• a diaphragm configured to displace a valve element of the supply valve, wherein
• a pilot chamber is formed on one side of the diaphragm,
• a feedback chamber communicating with the outlet port is formed on another side of the diaphragm,
• a pilot pressure supply solenoid valve is disposed in a flow path connecting the inlet port and the pilot chamber, and
• a pilot pressure discharge solenoid valve is disposed in a flow path through which a pressure fluid in the pilot chamber is discharged to an exterior, and wherein
• the fluid pressure control device further comprises a control unit configured to control the pilot pressure supply solenoid valve and the pilot pressure discharge solenoid valve,
• wherein, for any and all positions of displacement of the supply valve, the fluid pressure control device does not comprise a flow path through which the pressure fluid that has passed through a gap between the valve element and a valve seat of the supply valve is discharged to the exterior, and
• the standby mode is a mode for preparing return of the fluid actuator in a paused state to an operating state.