當閥門從進口端給水時，水流過針閥進入主閥控制室，并經過導閥、球閥流出主閥控制室到出口，此時主閥處于全開或浮動狀態。調定主閥上部的流量調節閥，可為主閥設定一定開度。調節針閥開度和調節導閥彈簧壓力，即可使主閥開度保持在設定開度，并在壓力變化時導閥進行自動調節，保持流量不變。
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