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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.