| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic control device to suppress the occurrence of trouble, such as the shock of an actuator or a boost to rapidly increase a pump discharge pressure. SOLUTION: First and second communication ports 30 and 31 are communicated with a tank when a switch valve 2 is in a neutral position and meanwhile, when the switch valve 2 is switched, either of the communication ports is cut off from a tank according to the switch position and communicated to the actuator side and the other is cut off from the tank and closed. Besides, constitution is such that the pressure, being higher, of pilot pressures taken out from a route running between a pressure compensation valve 6 and check valves 32 and 33 is selected and guided to a pilot line 13.</p> |
