| 摘要 |
PURPOSE:To suitably perform the supply of water at the time of thermal shrinkage and the draining of water at the time of thermal expansion by providing two-way valve for draining and supplying waters at a hot water tank and a supply water tank communicating with each other. CONSTITUTION:A two-way valve made of the first and the second check valves 21, 22 which supplies water in a supply water tank 17 communicating with a hot water tank 2 into the tank 2 is provided. When the hot water in the tank 2 is thermally shrinked, its pressure will decrease. When the pressure becomes lower than a set pressure, the second check valve 22 will automatically open, it allows the water in the tank 17 to be supplied through a siphon tube 18 into the tank 2. When the hot water in the tank 2 is, on the other hand, thermally expanded, its pressure will increase. When the pressure becomes higher than a set pressure, the first check valve 21 will automatically open, and it allows the hot water in the tank 2 to be exhausted through the tube 18 into the tank 17. Thus, it can prevent the adverse influence to the components in a hot water supplying apparatus 1 due to the excessiveness and shortage of circulating hot water and the unstability of the heat exchange. |
