| 摘要 |
<p>PROBLEM TO BE SOLVED: To lower cost burden and heighten work efficiency by installing a hot water backflow preventing means comprising a stopper and a ball, which opens or closes a route of a pipe while moving up and down due to water pressure and self weight, in a vertical line of the pipe which connects a pure water storage tank and a hot water tank. SOLUTION: A hot water backflow preventing means 300 is constituted of a diameter-widened pipe part 373a formed in a prescribed position in a vertical line of a fourth pipe 373, and a stopper 302 and a ball 303 installed in the inside of the diameter-widened pipe part 373a. As soon as the pure water in the pure water storage tank moves upward in the diameter-widened pipe part 373a by the pressure of water supplied to a hot water tank, the water hits the stopper 302. Consequently, while the stopper being prevented from moving upward and stopped, water is allowed to freely flow or at the time when pure water supply from the pure water storage tank to the hot water tank is finished, the passing route of the fourth pipe 373 is closed while the ball 303 being moved downward due to the self weight and thus backflow can be prevented.</p> |
