Exhaust valve is heating hot water pipe to avoid 'air-resistance', safeguard the normal hot water circulation device. 。 For the cause of adjust measures to local conditions, avoid heating hot water quantity loss of the most effective way is to eliminate manual exhaust, selects high quality, really good semi-automatic exhaust valve, semi-automatic vent a lot more developed country in the world have been widely considered and appropriate use. Semi-automatic exhaust valve solves the tedious labor manual exhaust, eliminated the heat tube son road only exists of water mouth, because can maintain hot exhaust and a temporary row luck road is smooth, material on the water because they don't work to save energy and water. Cause heating hot water quantity erosion is the main cause of our country, the author think is the heating hot water pipe number to install and use the more primitive, still lags behind the collection tank, exhaust valve manually. But the manual can only exist in the exhaust gate valves and piping can exhaust and can release the switch of hot water. Manual exhaust is plumbing pipes only must make the river gate, and in other parts of the water are illegal, heating regulations are not allowed, so far there is no way to stem jagged manual exhaust valve open time, after not for himself what the analysis does not allow suspects, manual vent valve is heating warm water main channel and the cause of failure. Because the manual vent is through water to air out under the pressure difference between utility, until released by hot water. It is not the same point with manual exhaust valves is not artificial wind run, its installation position must be set in pipeline Marine valves on the gas point, said gas collection point is at the top of the perfect point of horizontal pipe of water supply, the horizontal tube have 3 ‰ heeling degree requirements, not allowed to reveal to subsidence in and buckling in the situation of things such as situation, when the air into the valve body, valve will open, semi-automatic air out water mark after a rise, it will semi-automatic valve, hot water can not overflow, grubbing for manual exhaust than but, easy to form 'air-resistance' affect the heating effect and lead to loss of hot water quantity. Normal run wind should be quickly close the valve after discharge hot water, run the wind that ended, actually drain time varies is heating management department have no way to stem what, can only as a household word. In order to easy to operation, the valve is not installed in the set at the top of the tank outlet, but from the exit after the pipe to toilet or heaven, the gate valves installed on the sink or hose inserted in the sewage pipe to a loophole. Q: ball float a: semi-automatic exhaust valve development since the age-old, heating period has become the north city heating hot water quantity loss upper department big pains. Heating hot water pipe in the necessity of going into the air has the following three factors: 1. Circulation water pump office into the air; 2. Boiler or water pump shut down the line will initiation pressure, air can be inhaled; 3. When boiler operation or broken supply cold water, and cold water in the heating process will clutch out of the air. Ordinary residential building heating, a unit of a circuit, each circuit needs to install 1 ~ 2 exhaust valve, and each building on the basis of several different units, together is a lot of digital, it makes the normal daily manually run the wind will loss quantity of hot water, and the valve open time have no way to manage, and sometimes the top have run manually wind resident home unmanned, in order to prevent run because the wind moved the neighborhood contradiction, straight-tempered will manual gate valves open, become the 24 h at sichuan. Some thermal power plant heat energy power enterprise according to the actual survey, heating water per hour of 8, 000 t, 500 t per hour water loss, water loss is as high as 12, 000 t, fluid loss is six percentage hundred strong, water supply and water standards set by the state does not exceed 1, one hundred percent for this to take effective treatment method of congestion this flaw has become urgent. 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