| 摘要 |
PURPOSE:For avoiding the placement of a drain tank at a high place and reducing the size of drain recovery system, to connect the discharge passage from a water supply pump and the drain re-supply passage of a boiler with said drain tank. CONSTITUTION:During the steady operation of a boiler 3, water level exists between the maximum and minimum thereof, a water supply pump 1 has stopped, and a solenoid valve 24 is open. When the operation of a boiler 3 is continued and the water level in said boiler 3 tends to lower below minimum water level setting, a water level detector 27 emits signal to start said water supply pump 1. Then said solenoid valve 24 is closed according to sequence, and the water saturated at a set value of pressure in a drain tank 2 is pushed out of said drain tank 2 into boiler 3 by the discharge pressure of said water supply tank 2. When the water level in said boiler 3 reaches maximum water level setting, said water supply pump 1 stops and said solenoid valve 24 opens in accordance with the signal of said water level detector 27. |
