| 摘要 |
PURPOSE:To perform reliable disconnection between the water tank side and the water source side and the outside through a simple method by providing an on-off valve located in a discharge passage and opening and closing the discharge passage and a check valve located at a joint between a water feed passage and the discharge passage and preventing the reverse flow of water in a water tank. CONSTITUTION:Since filling with hot water is completed in a high water pressure state and a filling-with-hot-water valve 12 is closed, an open air release valve 21 is maintained in a closed state, and the interior of a pressure chamber 18 is brought into a state that water gathers. A second check valve 23 is brought into a closed state by means of a high water pressure owing to a water level in a bath tub 4. To recover water remaining in the pressure chamber 18, a normally opening type solenoid valve 22 is opened. A second check valve 23 prevents the occurrence of a reverse flow from the bath tub 4 side, and the interior of the pressure chamber 18 is opened to the open air through an open air feed passage 26, a communicating chamber 25, and a discharge passage 27. Since a pressure in the pressure chamber 18 is reduced from a high water pressure owing to a water level in the bath tub 4, the open air release valve 21 is opened through the force of a spring 28, and the pressure chamber 18 is filled with the open air. The open air is present between the water supply side and the bath tub 4 side, resulting in disconnection between the supply water side and the bath tub 4 side. |
