| 摘要 |
<p>A hydraulic control valve is switched by an output hydraulic pressure from a remote controlled valve. Between an output port of the remote controlled valve and a pilot port of the hydraulic control valve, a change-over means is provided, which is adapted to connect the output port of the remote controlled valve to the pilot port of the hydraulic control valve when the remote controlled valve is operated, and the pilot port of the hydraulic control valve to a tank when the remote-controlled valve is shifted to a neutral position. This change-over means consists of a hydraulic change-over valve adapted to obtain the above-mentioned connected condition by hydraulic output pressure from the remote-controlled operating valve, or a solenoid change-over valve adapted to electrically detect an operation of the remote-controlled operating valve and obtain the above-mentioned connecting condition.</p> |
