本實用新型全部材料采用耐腐蝕不銹鋼。可在任何位置的管路上安裝，防止介質逆流，鍋爐給水系統上回，其連接方式是利用原有管道兩端法蘭對夾即可投入運行。其各項指標都優于目前市售的任何一種上回閥。它的運用范圍廣泛，凡水、氣、油、酸、堿液、氫、氨、特別消防管道等介質均可使用。

  Whole material of this practical new type uses corrosion preventive stainless steel.Can install on the road at the pipe of any seat,preventing the medium go against the current,the boiler is to river system all last times,and namely his attended mode is using original pipeline both ends flanges can dive into the operating to the clamp.Any one kind of last time valve that his all quota all is superior to at present that sells in the city.Its application scope be extensively,and the medium such as Shui Qi,oil,acid,lye,hydrogen,ammonia and special fire fighting pipeline etc all can use altogether.

閥體材料Body material：WCB、1CR18Ni9Ti、CF3、CF8、CF3M、CF8M。