... wafer/lug/flange butterfly valve 1.DN50-1200(2"~48") 2.150/200PSI 3.different standards 4.manual,pneumatic,electric drivers Features ... , Oils, Acids,Alkalis, etc.Operating mode manual, worm gear, pneumatic, electric, etc. Standard: Design & ManufactureFlange ConnectionFace to Face DimensionTest ... oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); wafer,lug,flange butterfly valve for water works