| 摘要 |
<p>PROBLEM TO BE SOLVED: To simplify structures of device total unit constitution and a pressure compensating flow control valve fixedly controlling a differential pressure before/after the control valve, and cope with each control valve of hydraulic pilot type, manually switching type and electromagnetic switching type. SOLUTION: A throttle 11 is provided in a load pressure introducing pipe line 10 introducing a load pressure to a pressure compensating flow control valve 6, a solenoid proportional relief valve 12 is provided branching from the load pressure introducing pipe line 10 in an outlet side of this throttle 11, and a preset pressure of this relief valve 12 is changed, so as to change a differential pressure.</p> |
