| 摘要 |
PURPOSE:To enable reduction of the size of a device, to reduce a manufacturing cost, and to save energy, by a method wherein, when plural flow rate direction control valves are controlled, a pressure compensating device is controlled so that a maximum feed oil amount to each hydraulic actuator is decreased. CONSTITUTION:Cylinder chambers 12 and 13 of pressure compensating devices 10 and 11 are connected to switching valves 18 and 19 actuating in linkage with other flow rate direction control valves 4 and 5, respectively. The resilient forces of the springs of the pressure compensating devices 10 and 11 are increased when the other flow rate direction control valves 4 and 5 are in a neutral position, and are decreased when in a function position. This, if the plural flow rate direction control valves 4 and 5 are controlled, enables automatic decrease of the maximum amount of oil fed to hydraulic actuators 2 and 3, resulting in the possibility to decrease the volume of a pump and a prime mover serving to drive a pump. This enables reduction of the size of a device, reduction of a manufacturing cost, and saving of energy.
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