当水池水面下降后，浮球阀重新开启，控制室水压下降，主阀再次开启继续供水，保持液面的设定高度。
When the water tank after falling, floating ball valve to open, the control room pressure drops, the main valve to open again to water, keep the level set height.
在稳定状态下，控制室进水、排水相同，主阀开度不变，出口压力稳定。
In the steady state, the control room water, drainage same, the main valve opening constant outlet pressure stability.
控制室停止排水，此时主阀控制室内压力升高并关闭主阀，出口压力不再升高。
Control room to stop the drainage, when the main valve control room pressure rise and close the main valve outlet pressure will not rise.
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