| 摘要 |
PURPOSE:To obtain a small-sized tank by sending the water sucked up by a pump directly to a discharge port until a valve is opened for preventing the reduction of the air amount in a pressure tank caused by sending the water from the pump once into the pressure tank. CONSTITUTION:When the discharge pressure is lower than the air pressure enclosed in a pressure tank 2, a valve port 27 of an air case 16 is closed by a float 29, and the water sucked up by a pump 3 is directly supplied to a spigot from a discharge port 22 via a self-suction tank 6, a pressure pipe 7, a discharge pipe 15, and a flow passage 17 of an air valve case 16. At this stage, when the spigot is throttled, since the discharge pressure is increased over the air pressure enclosed in the pressure tank 2, a valve 26 is opened, the float 29 is moved upward, and the water passes through the valve port 27 and is introduced into the pressure tank 2 via a connecting passage 25. Consequently, the air pressure in the pressure tank is increased, and when it comes to a water level A, a pressure switch is off, and the pump 3 is stopped from driving. |
