HOT WATER POURING DEVICE TO APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a hot water pouring device to an apparatus for certainly preventing an accident where a cut in water supply or the like causes negative pressure on a tap water side and soiled water of a bath or the like flows backward to a water pipe. SOLUTION: A backflow preventing device 13 has an atmosphere open valve 27 opened or closed based on a pressure difference between water pressure near a water pouring valve or a hot water pouring valve and water pressure in the backflow preventing device. The area ratio between an area receiving the water pressure near the water pouring valve or the hot water pouring valve in the atmosphere open valve and an area receiving the water pressure in the backflow preventing device is set proportional to the ratio between pressure in a hot water supply circuit increased by delayed water temperature rise after use of the hot water supply and the water pressure. Therefore, the atmosphere open valve 27 is operated for a moment by the pressure increase in the hot water supply circuit by the delayed water temperature rise after the hot water supply, so that the fixing is automatically prevented, and the soiled water of a bath or the like can be certainly prevented from flowing backward to the water pipe. COPYRIGHT: (C)2004,JPO