We are offering here the 40 mm Butterfly Valve Casting Parts that normally have bodies that fit between two pipe spines, the most common being carry and wafer structure plan. Butterfly valve disk: The disk is how the valve stops stream. The disk is how the valve stops stream it is equivalent to a plug in a plug valve a gate in an gate valve or a ball in a ball valve. The butterfly valves are especially well-suited for the handling of large fluid flows of fluid. The offered 40 mm Butterfly Valve Casting Parts are made for use in the various industries.