| 摘要 |
PURPOSE:To prevent the excessive flux from flowing through a pressure compensating flux control valve at the time of starting an operation by working the upstream pressure of a fluid inlet upon a compensator spool. CONSTITUTION:When a switching valve 13 is moved to a neutral position 13b so as to cause no flowing into a fluid inlet 6, a spool 4 is moved against a spring 9 by pump discharge pressure introduced through a pressure introducing hole 11, which results in that a variable throttle 5 is closed to cut off the connection between a fluid inlet 6 and an outlet 7. When the operation of the switching valve 13 causes a fluid to flow into the inlet 6 again, the variable throttle 5 of the spool 4 is gradually opened so that the excessive flux may not flow to the outlet 7, whereby when a pressure compensating flux control valve starts to operate, the excessive flux is prevented from passing through the valve. |
