| 摘要 |
PROBLEM TO BE SOLVED: To prevent inconvenience that in a water feed valve device provided with a first solenoid valve 12 on an upstream side and a second solenoid valve 13 on a downstream side connected in series, particularly in the device in which the first solenoid valve is constituted by a pilot type solenoid valve and the second solenoid valve is constituted by a direct acting type solenoid valve, when power failure occurs during water-feeding, the second solenoid valve is closed with a delay from closure of the first solenoid valve and a water pressure of a communication passage between both solenoid valves is held high, and therefore, when the solenoid of the second solenoid valve is miniaturized, the second solenoid valve is not opened by the influence of the water pressure even after restoration of power failure and water-feeding remains interrupted. SOLUTION: A third solenoid valve 14 comprising a direct acting small size solenoid valve is provided in parallel to the second solenoid valve 13. Further, when the second solenoid valve 13 is closed during water-feeding, energization to the solenoid 127 of the first solenoid valve 12 is once stopped and restoration control for re-starting the energization to the solenoid 127 of the first solenoid valve 12 is executed in the state that energization to the solenoids 134, 144 of the second solenoid valve 13 and the third solenoid valve 14 is performed. COPYRIGHT: (C)2008,JPO&INPIT
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