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压力输水管中经常会有一些未溶解的空气,常造成输水能力降低(5～15％),并导致水头损失增加。从管道中尽可能地排除未溶解的空气,可以提高管道系统的经济性、效率和输水能力。排除管道中的空气,一般用排气门和排气器。排气门的缺点是重量大(达70公斤),工作可靠性较低、消耗有色金属。为克服这些缺点,苏联曾研究一种新型排气门。
Often there is some undissolved air in the pressure water pipe, often resulting in reduced water transfer capacity (5 to 15%) and increased head loss. Excluding undissolved air from the pipeline as much as possible can improve the economic efficiency, efficiency, and water delivery capacity of the pipeline system. Excluding the air in the pipeline, exhaust valves and exhausters are generally used. Disadvantages of the exhaust valve are its large weight (up to 70 kg), its low operating reliability, and its consumption of non-ferrous metals. To overcome these shortcomings, the Soviet Union had studied a new exhaust valve.