控制输水管道瞬态液柱分离的空气阀调压室

本文提出了控制输水管道瞬态液柱分离的新型空气阀调压室，就是在输水线路上设置短管形成局部凸起点，短管顶部密封，然后在它顶部设置空气阀。在正常输水时，空气阀关闭，调压室（短管）充满水体，没有气体。当调压室顶部水压下降到大气压以下时，空气阀进气，在调压室中形成气囊，防止输水管道发生液体汽化现象，或者超过管道承受能力的高度真空压力。当调压室底部水压超过大气压时，调压室中气体压缩，气体由空气阀缓慢排出，避免发生较大冲击水压。

A New Air-valve Surge Tank for Control of Liquid Column Separations in Water Supply Projects

A new air-valve surge tank is developed for control of liquid column separations in water supply projects, consisting of a short pipe and air valves on its top. They are installed on the main to form a series of local convexes. The air-valve surge tanks are full of water during normal operations. As soon as the water pressure drops under the atmospheric pressure, air will be sucked into the tank by the air valve to form an air chamber. The air in the tank will be released slowly while the water pressure is greater than the atmospheric pressure. The application indicates that the tank can not only control the negative pressure during hydraulic transients, but the positive pressure.