| 摘要 |
<p>PURPOSE:To reduce the load pressure detected at the time an operation valve has been slightly operated for reducing shock, and also the reduce the leakage rate from an actuator port at the time the operation valve is in the neutral position. CONSTITUTION:In the spool hole 11 of a valve body 10, an output port 12, a pump port 13, an actuator port 14, a tank port 15, and a load-pressure detecting port 16 are formed, and also in the spool 19 insertedly fitted to the spool hole 11, first and second small-diameter parts 20, 21, and a load-pressure detecting hole 22 are formed. The load-pressure detecting hole 22 is opened to the first small-diameter part by a first port 23, and also it is opened to the load-pressure detecting port by a second port 24, and further it is opened to the actuator port by a third port 26. And the second port is opened to the load-pressure detecting port when the spool has been moved right and left in a very small stroke, and the outer circumferential surface of which the third port has been opened is made to have a small diameter, and a gap 30 opened to the actuator port is formed between the spool hole and the outer circumferential surface.</p> |
