描述
截止止回閥是一種可起到截止和止回兩種作用的閥門。這種閥門是把閥桿和閥瓣的連接設計成可以開的結構，所以，在關閉閥門時，閥桿可頂住閥瓣運動，使閥瓣密封面與閥座密封面密合，達到關閉閥門狀態。此時，閥門起切斷管路中介質的截止閥作用。當開啟閥門時，是閥桿與閥瓣脫開，此時，閥門可作為防止介質倒流的止回閥用。
The stop check valve is a kind of valve that can play the two functions of cut-off and check. The valve is designed to connect the valve stem and the valve to the open structure, so when the valve is closed, the stem can hold the valve movement to close the valve seal face to the seat sealing surface to close the valve state. At this point, the valve starts cutting off the valve of the medium in the pipeline. When the valve is opened, the stem is disconnected from the disc. At this time, the valve can be used as a check valve to prevent the backflow of the medium.
特點
以前在泵的出口處往往都需要安裝一個截止閥（或閘閥）和一個止回閥，現在就可以用這種截止、止回、兩用閥來代替了。這種閥門尤其適合于安裝位置受到限制的場合。
A cut-off valve (or gate valve) and a check valve are often required to be installed at the outlet of the pump, which can now be replaced by this cut-off, check, and dual use valves. This valve is especially suitable for occasions where the installation position is limited.
用途--
截止止回閥廣泛用于給排水、煤氣、電力、冶金、石油、化工、熱油系統、蒸汽系統、冷熱水、系統輕紡以及城建等行業，在蒸汽、水、油、氣、燃氣、氮氣、氫氣、液體、硝酸類、醋酸類類介質的管路上作啟閉用。
