| 摘要 |
<p>A pressure compensating valve comprising a check valve portion formed by forming in a valve main body a hole for a check valve having an inlet port and an outlet port and slidably inserting into the hole for a check valve a valve for establishing and cutting off a communication between the inlet and outlet ports, and a pressure reducing valve portion formed by forming in a valve main body a hole for a pressure reducing valve which has first, second and third ports and is coaxial with the hole for a check valve, inserting slidably a spool into the hole for a pressure reducing valve, forming on sides of the spool so inserted a first pressure chamber communicating with the first port and a second pressure chamber communicating with the third port, respectively, establishing a communication between the second and third ports by virtue of the pressure of the first pressure chamber and cutting off the communication between the second and third ports by virtue of the pressure of the second pressure chamber, wherein the spool is pushed by a spring in such a direction as to cut off the communication between the second and third ports to be brought into a press contact with the valve so as to push the valve in the closing direction, the pressure compensating valve being characterized by the provision of further a pressure receiving chamber communicating with the second port via a restrictor for pushing the spool in such a direction as to close the valve by virtue of the internal pressure thereof, an oil passageway for establishing a communiction between the pressure receiving chamber and the outlet port when the valve is in a communicating position and pressure control means for adjustably setting a pressure inside the pressure receiving chamber. <IMAGE></p> |
