... welcome 4.ISO,CE Worm SS Lug butterfly valve Model of valve:D371XBody of valve : cast iron/ductile iron/wcb Disc of ... # steel,SS420,SS304&316 Seat of valve : EPDM, wear-resistant EPDM,NBR,PTFE,Viton Handle of valve : iron, punching malleable iron, aluminum ... handle Normal Diameter of valve: DN40-600 Normal ...