| 摘要 |
PURPOSE:To economize energy, by providing a pressurized fluid supply passage with a flow control valve for returning some of a pressurized fluid to a tank and by using a variable orifice which changes depending on the load upon a fluid machine to perform control. CONSTITUTION:A flow control valve 21 moves gradually toward a low pressure chamber 25 depending on the fluid pressure difference around a variable orifice 20 to connect a high pressure chamber 23 and a drain passage 28 to each other to return some of pressurized oil in a main passage 10 to a tank 3 through a passage 24. The cross-sectional area of a variable orifice 20 for effecting the control action of the valve 21 is changed by a fluid passage changeover valve 12 which is operated by an increase in the load upon a power steering gear 5. According to this constitution, pumps 1, 2 are prevented from useless power consumption and the performance of the fluid machine 5 is much improved. |
