Novel truss type butterfly plate structure of valve for limited space of ship

The utility model belongs to the technical field of steam turbine accessories, and particularly relates to a novel truss type butterfly plate structure of a valve for a limited space of a ship. The check valve comprises a valve plate, a valve body, a first valve shaft and a second valve shaft, the valve plate is an octagonal butterfly plate of a truss type structure, the valve body is of an annular structure, the first valve shaft and the second valve shaft are of two half-shaft structures, and the valve plate is fixed to the inner side of the valve body on the two sides of the coaxial line through valve body bosses. The truss type butterfly plate is adopted, the truss type butterfly plate is welded into a whole, heat treatment is carried out before machining to eliminate welding stress, and meanwhile, due to the fact that the cross section is far away from the axis and the inertia moment is large, the bearing capacity is large; media can pass through the middle of the butterfly plate truss structure, the flo