| 摘要 |
PURPOSE:To enable increase and decrease of the flow rate of the one apparatus without changing a flow rate to the other apparatus, by a method wherein a single pump is commonly used, flow dividers are respectively located to a delivery flow rate control means on the pump side and in a branch passage running to a fluid apparatus. CONSTITUTION:A suction port 11a of a pump 11 is connected to a reservoir 17, and a delivery port 11b is connected to a flow rate control valve 20 with an electromagnetic valve. A variable throttle 21a is built in an electromagnetic valve 21 in a control valve 20, and a spool valve 23, adapted to regulate the opening of a bypass port 22 so that pressures before and after the variable throttle 21a are kept at a specified value, and a spring 24 through the force of which to press in a direction in which the bypass port 22 is closed, are provided. The control valve 20 with an electromagnetic valve, paired with a constant delivery pump 11, has function of keeping a flow rate at a specified value irrespective of a change in the number of revolutions of a pump and serves as a flow rate control means which regulates a delivery flow rate to an arbitray value by changing the opening of the variable valve 21a. |
