| 摘要 |
PURPOSE:To prevent the reverse flow and the wasteful use of bath tub water by a method wherein a plurality of check valves are situated in series in a water passage through which hot water is fed from a hot water feeder to a bath circulating circuit, an air release valve is disposed between the check valves, and the air port thereof is connected to the suction side of the pump of the bath circulating circuit through a float valve. CONSTITUTION:When hot water is fed to a bath tube A, a valve body 1 of a first check valve E is forcibly opened by means of a water pass pressure, and a second check valve F is also opened for the flow of water therethrough. In this case, since an air port 7 is closed by an air release valve body 3 by means of water flowing through an air chamber 8, water does not flow to the outside of a water passage. When water pass is stopped, the two check valves 1 and 2 close the water pass. In this case, a valve lever 11 hooks with a valve stem 10 to open the valve body 3, flowing-out water flows in a float valve H, and with a float 12 floaded, a valve port 13 is opened. When additional combustion is effected after the stop of the passage of water from a hot water feeder B, a pump I is run, bath hot water is heated by a bath heat exchanger 18 as bath hot water is circulated. The suction side is brought into a negative pressure state, a check valve body 15 is opened against a spring 16, and water in a float valve H is sucked. When water runs short, the valve port 13 is closed. After the stop of additional combustion, the check valve body 15 is closed to prevent outflow of bath hot water. |
