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Exhaust valve applied to independent heating system, central heating systems, heating boiler, central air conditioning, floor heating and solar heating systems pipe exhaust. Because usually dissolved in water have a certain amount of air, and the solubility of air decrease as the temperature rises, so the gases in the water cycle in the process gradually separates from the water and gradually got together to form larger bubbles and even gas column, because the added water, so often there is gas.When you have gas overflow system, gas through pipelines go up, eventually gathered at the highest point of the system,

And row valve General are installation in system highest points, dang gas into row valve valve cavity gathered in row valve of upper, with valve within gas of increased, pressure rose, dang gas pressure is greater than system pressure Shi, gas will makes cavity within water declined, buoy with level with declined, open exhaust mouth; gas row do Hou, level rose, buoy also with of rose, close exhaust mouth. The same way, when the system generates negative pressure, valve cavity water level went down and vent opening, because the outside atmospheric pressure greater than the system pressure, so the atmosphere through the exhaust port into the system, to prevent harm of negative pressure. Tighten the valve cap from the valve body, valve stops the exhaust, under normal circumstances, the valve cap should be in an open State. Exhaust valve can also be used with cut off valve, exhaust valve repair.