| 摘要 |
PROBLEM TO BE SOLVED: To change a flow dividing ratio determined on the basis of a switching amount of a switch valve, according to a purpose.SOLUTION: Load pressures of actuators A1, A2 to which compensator valves C1, C2 are connected, are guided to pressure chambers 9, 10 of one of the compensator valves C1, C2, a maximum load pressure selected by selecting means 4, is guided to pressure chambers 11, 12 of the other one of the compensator valves C1, C2, and openings of the compensator valves C1, C2 are controlled by pressure actions of both pressure chambers 9, 10 and 11, 12, thus a pump discharge amount is divided according to a switching amount of a plurality of switch valves V1, V2. A drain passage 13 is disposed to connect the pressure chambers 9, 10 of one of the compensator valves C1, C2 to a tank T, and a flow dividing ratio changing valve CV for controlling the pressures of the pressure chambers 9, 10 at one side is disposed in the drain passage 13. |
