| 摘要 |
PURPOSE:To make it possible to operate easily by change over a selector valve automatically by operating a operation circuit and constituting so that a directional selector valve can be operated. CONSTITUTION:When a positioning cylinder 6 is operated, if a pilot valve 15 is operated, a signal from a pilot pump 14 is transmitted to a directional selector valve 13, and a direction from a main pump 11 is changed over to expand and contract the cylinder 6. When a hydraulic motor 5 is operated, if a pilot valve 21 is operated, signal pressure from the pump 14 is applied to a selector valve 22 and the selector valve 13. The signal pressure is firstly transferred to the selector valve 22 through a throttle 24, the selector valve 22 is moved against a spring 25, and the selector valve 13 is connected to the motor 5 to run the motor 5. The signal pressure is also transferred to a selector valve 23, and is changed over a cut off condition against a spring 28, and when both valves 15 and 21 are operated simultaneously, signal pressure of the valve 21 is preferentially transferred to the valve 13 to operate the motor 5. |
