| 摘要 |
PURPOSE:To prevent hammering by providing an emergency drain bypass system which bypasses a water level adjustment valve of an emergency drain discharge system and is equipped with a bypass flow adjustment valve capable of adjusting drain flow. CONSTITUTION:An emergency drain bypass system 20, bypassing a water level adjustment valve 7 of an emergency drain discharge system 5, is provided with a bypass flow adjustment valve 21. A level switch 22, which detects a level lower than the established value of the water level of an emergency water level control device 9 for a water supply heater 1, is provided. A control device 23 for a bypass flow adjustment valve controls the bypass flow adjustment valve 21 on the basis of a signal from the level switch 22. Thus, not only hammering during operation of the emergency drain discharge system but also lowering of heat efficiency and erosion of piping can be prevented. |
