| 摘要 |
PURPOSE:To limit the water leakage to the degree of the volume of detecting section, by providing a valve having specific gravity lower than 1 at the conducting port formed between a tank and a detecting section while closing the conducting port tightly when the water level drops below the valve due to the water leakage. CONSTITUTION:When the water leakage occurs at a portion of a conduit 2, the float 81 in a detecting section 12 will drop with the water level thereby a magnet 82 in the float 81 is detached from a lead switch 83 to turn it off then turn a circulation pump and a heater 9 off thus to stop the circulating function. Consequently when the water level in the detecting section 12 drops to lift a resilient valve 11 made of synthetic resin having specific gravity lower than 1 above the water level, the conducting port 14 is closed tightly by the self-weight of the valve 11 thus to produce negative pressure in the tank 3 and to stop the water leakage, thereby the water leakage can be limited to the degree of volume of the detecting section 12. |
