1 Rubber lined butterfly valve 2 double flange type 3 Material:ductile cast iron 4 ... to 50kg3.Surface treatment:Polishing,maching,plating,heat treatment,etc4.Casting facility:electric stove5.Machining:numerical lathe,milling machine,planer,grinder6 ... .Application:industrial parts,machinery parts,valve parts,train,craft,doorhandle,construction and so on.7.Packing ...