當閥門從進口端給水時，水流流過針閥進入主閥控制室，當電磁導閥打開時，控制室內的水經電磁導閥、球閥流出。球閥開度大于針閥開度，主閥控制室內壓力很低，主閥處于全開狀態。
當電磁導閥關閉時，主閥控制室的水不能流出，控制室升壓，推動膜片關閉主閥。
http://www.shqgfm.com
http://www.sh-qigao.com
http://www.qigaofamen.com
http://www.qigaovalve.com
http://www.qigaov.com
http://www.chinaqigao.com
http://www.shqgfm.net
http://www.qigaov.net
http://www.qgzhafa.com
http://www.qgqiufa.com
http://www.qgqdf.com
http://www.qgdzf.com
http://www.qgdiefa.com
http://www.qgjzf.com
http://www.qgzhf.com
http://www.qgssf.com
http://www.qgglq.com
http://www.qgflf.com
http://www.qggmf.com
http://www.qgslf.com
http://www.qgdcf.com
http://www.qgzhq.com
http://www.qgdwf.com
http://www.qgyqf.com
http://www.zhengyev.com
http://www.shbtbf.com