| 摘要 |
PURPOSE:To prevent closing-up of a valve and to improve precision, by a method wherein, through the closing of a first opening and closing valve corresponding to a liquid level detected and the simultaneous opening or closing of a second opening and closing valve, a liquid is intermittently stowed into and discharged from a tank. CONSTITUTION:A draining device for small amount of liquid opens an opening and closing valve 4 corresponding to a liquid level detected. Through the receipt of a signal from a water level gauge 7 or a weighing device 8 detecting that a liquid level in a tank 2 goes to a level H, it automatically closes a first opening and closing valve 4, and simultaneously, it opens a second opening and closing valve 6. Through the receipt of the signal from the water level gauge 7 or the weighing device 8 detecting that the liquid level in the tank 2 goes to a level L, it automatically closes the second opening and closing valve 6. This enables to drain a specific amount of liquid at given time intervals, permits the opening degree of the valve to increase compared with conventional small amount continuous draining system, prevents closing-up of the valve, and enables the improvement of precision. |
