Frishauf, Holtz, Goodman, Langer & Chick
Pressurized fluid supply system
 A pressurized fluid supply system, in which a plurality of pressure compensation valves are connected to a pump discharge line of a hydraulic pump in parallel, and direction control valves are provided at the outlet side of each pressure compensation valve to supply a discharged pressurized fluid from the hydraulic pump to a plurality of actuators. The pressure compensation valves include a check valve portion establishing and blocking communication between the pump discharge line and the inlet port of the direction control valve, and a pressure reduction valve portion for supplying a reduced pressure from the pump discharge line. The check valve portion shifts in a valve opening direction in response to an inlet pressure and shifts in a valve closing direction in response to an outlet pressure. The pressure reduction valve portion has a first and a second pressure chamber. Pressure in the first pressure chamber urges a valve element toward a position establishing communication between the inlet side and the outlet side, and a pressure in the second pressure chamber cooperates with a spring to urge the valve element to a position blocking communication between the inlet side and the outlet side, and biasing the check valve portion toward the valve closing direction. A load pressure of the actuator, to which the pressurized fluid is supplied, is introduced into the first pressure chamber and fluidly connects all of the second pressure chambers together. 
Kabushiki Kaisha Komatsu Seisakusho
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Teruo Mitsumasa Keisuke Masamitsu Jun Kazunori Tadao
Akiyama Akashi Taka Takeuchi Maruyama Ikei Karakama