| 摘要 |
PURPOSE:To dissolve the lowering of pump line flow by supplying the flow command value, inputted into the controller of a control valve device by an output signal based on the detection of a pressure selecting means selecting a pump line, with a decreased discharge flow part decreased at the time of selecting the pump like. CONSTITUTION:When the pressure of a pump line 6 becomes higher than that of a delivery line 7, a shuttle valve 81 is moved onto the second port 81b side, so that the pressure of the pump line 6 is selected, and a control device 4 is controlled through the communication with a pressure line 2. In association with this communication, an output signal from the voltage takeoff connection 28a of a feedback circuit 30 coincides with the voltage value of a setter 28b, and the switch 29b of a correcting means 29 is turned on by an 'on' signal from a comparator 28c, as well as bias voltage from a correction voltage output part 29a is added to the flow command value Qi. With this command value, a magnetic proportional control valve 41 is operated to correct the inclination of a variable control element 11 so as to increase discharge flow and make up for decreased discharge flow. |
