| 摘要 |
<p>PURPOSE:To minimize hydraulic loss by disposing a supply valve upstream in relation to a drain valve. CONSTITUTION:A supply valve 20 is disposed in a control line 17 arranged upstream in relation to a drain valve 6. The supply valve 20 is perfectly identical to the drain valve 6 in its construction and a solenoid coil 21 controls the operation of a valve 22. Both valves 6, 20 are controlled in their opening/closing operation by means of an electronic circuit, when a circuit controlling the supply valve 20 receives a pressure control signal, it transmits a solenoid current increasing in proportion to the received signal to the solenoid coil 21 of the supply valve 20. Accordingly, when a signal for enlarging the opening of drain valve 6 is input therein, a solenoid signal for shrinking the opening of the valve 22 is input to the supply valve 20. Then, an amount of drain discharged from the drain valve 6 is reduced as well as the pressure in the chamber 7 of a pressure regulation valve 5 is decreased.</p> |
