| 摘要 |
<p>PURPOSE:To supply pressure oil into the other actuator which is not reaching the stroke end, by constituting an inner passage by means of a pressure reducing valve part composed of a throttle communicated with a load pressure detecting passage connected to a tank by a throttle. CONSTITUTION:Pressure oil in a second pressure chamber 45 is allowed to flow from a throttle 62, a fourth hole 59, and a second small diameter part 60 to a third port 42 and then allowed to flow into a load pressure detecting passage 17, and the load pressure detecting passage 17 is connected to a tank 26 by a throttle 25, thereby differential pressure is generated across the throttle 62, and load pressure PLS becomes lower than pressure of the second pressure chamber 45. When the pressure in the second pressure chamber 45 becomes pump discharge pressure P0 after an actuator reaches the stroke end and load pressure P1 and pump discharge pressure P0 are made equal to each other, the load pressure PLS to be output to the third port 42 becomes lower than the pump discharge pressure P0 by the pressure proportional to the diameter of the throttle 62. Accordingly, discharge pressure oil can be supplied into the other actuator without closing an inlet port 34 and an outlet port 35.</p> |
