FEED WATER CONTROL DEVICE

摘要

PURPOSE:To control fluid by using the energy of a dry cell for a long period, without using a solenoid valve of a latch type. CONSTITUTION:In an automatic flushing device 10, a pressure reducing valve 48 is arranged between a pressure chamber 46 of a flush valve of an automatic closing type 34 and a pilot, solenoid valve 50 in order to limit the hydraulic pressure, which acts on the solenoid valve 50, to a prescribed pressure. With this, the energy consumption of the dry cell, which is consumed to bring a solenoid valve plunger 122 into valve opening operation, resisting the hydraulic pressure, can be reduced. After the solenoid valve 50 is opened, a driving circuit 28 drives the solenoid valve 50 at a smaller electric current than is required when the solenoid valve 50 comes into valve opening operation and keeps the solenoid valve in an open state. With this, the energy of the dry cell, which is consumed while the solenoid valve is kept open, can be reduced. Putting together these effects, the energy consumption per one-time operation of the flushing device 10 can be cut down, and the flushing device can be operated by the energy of the dry cell for a long period. The pressure reducing valve 48 may be arranged at the upstream side of a flushing valve 162.