| 摘要 |
<p>A hydraulic circuit capable of locking and unlocking a plurality of actuators simultaneously, whether a control valve for fluid supply control of a hydraulic actuator is of pilot operated type or other type. The circuit comprises a channel leading to a tank from a hydraulic pump not through the respective control valves, and first and second switchover valves (20, 24) for opening and closing the oil passage.</p> |
