| 摘要 |
PURPOSE:To improve the response of pump and to prevent noise by converging the delivery fluids from two variable pumps through check valves then feeding to a throttle valve and controlling each variable pump such that the differential pressure across said throttle valve will be constant. CONSTITUTION:Delivery liquids from variable pumps 1, 31 will pass through check valves 4, 32 and converged then fed to a throttle valve 5 and to a hydraulic cylinder 3. Here, a flow control pilot valve 6a in a controller 6 will control the delivery of said pump 1 to make constant the differential pressure across the throttle valve 5 while a controller 6' will perform similar control with respect to the pump 31. Since neither pump 1, 31 will deliver excessive flow, noise is prevented while the response is improved because of relatively small pump capacity. |
