... : 1. Size: 2"to48"wafer type, lug type and double flanged type 2. Materials: Body: Cast iron, carbon ... steel, 304S. S, 316S. S and aluminum bronze. Disc: Ni-plated ductile iron, Nylon coated ... ductile iron, 304S. S, 316S. S, aluminum bronze and monel. Shaft: 416S. Sand316S. S, 17-4PH. Seat: ... pipes with t he nominal pressure between 16MPa and 40MPa 2) At the time of opening, ...