... valve 1.19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model ... : Ni coated ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat ... ,NBR,PTFE,Viton Handle of valve : iron, punching malleable iron, aluminum handle Normal Diameter of valve: DN25- 300 Normal Pressure of ...