... type butterfly valve Material:s.s c.s DN:2"~48". Disc: Ni-plated ductile iron, Nylon coated ductile iron, 304S. S, 316S. Body: Cast ... iron, carbon steel, 304S. S, 316S. S and aluminum bronze3)Materials:Working Pressure ... high temperature EPDM, food grade EPDM, NBR, abrasive c)Shaft: 416S. Sand316S. S, 17-4pHS, aluminum bronze and monel.resistant NBR, ...