| 摘要 |
PURPOSE:To prevent higher pressure rise than necessary, in a device where a service port for connecting a breaker or a nibbler such as power shovel is provided, from having an influence upon other actuators on the service port side. CONSTITUTION:An opening/closing valve 26 is connected to a load detection passage 25 in a switching valve 7 which is. connected to the service port side, and when load pressure on the main actuator A side has reached a preset one, the switching valve 26 is closed to prevent the pressure on the service port side from being fed-back to a regulator. |
