| 摘要 |
PURPOSE:To obtain a flow rate control characteristic linearly proportional to a set command signal by providing a proportional solenoid control valve means which throttles to control pressure oil discharged from a pump element, and an oil passage switching means which directly discharges the pressure oil discharged from the pump element. CONSTITUTION:A proportional solenoid throttle valve 21 throttles to control pressure oil discharged from a pump element 10. The proportional solenoid throttle valve 21 and a pressure compensation valve 22 compose a well-known proportional solenoid pressure adjusting valve. A selector valve 23 has functions of switching checking function of a check valve 24 and switching insertion of the proportional solenoid pressure adjusting valve into a circuit. It is therefore possible to obtain a flow rate control characteristic almost linearly proportional to a set command signal in the whole area of control range. |
