| 摘要 |
A fluid control device provided with a plurality of switching valves and a plurality of relief valves, wherein a sub-relief passage communicating with a tank when the switching valves are in any state other than neutral is branched from a parallel passage for guiding a high-pressure hydraulic fluid to the switching valves, a sub-relief valve is provided within the sub-relief passage, and a check valve that minimizes the flow of hydraulic fluid toward a hydraulic pressure supply source is provided between switching valves and the point of branching of the sub-relief passage in the parallel passage, whereby the number of components and man-hours for assembly can be reduced due to the sub-relief passage having no check valve, hydraulic fluid can be prevented from heading toward a pump from an actuator even when the plurality of switching valves are operated simultaneously, and with no need for high hydraulic fluid pressure, high-pressure hydraulic fluid is prevented from being guided to an actuator having comparatively low pressure-resistant performance. |
