Double eccentric rose fly valve valve body and double eccentric butterfly valve

摘要

PROBLEM TO BE SOLVED: To secure a sealing property by suppressing the occurrence of deformation and bending of a valve body when a valve is closed even with a high pressure fluid while reducing the weight, and to concentrate stress due to a load acting from the fluid. To provide a valve body and a butterfly valve of a double eccentric butterfly valve that prevents the occurrence and improves operability, reliability and durability. SOLUTION: A surface 2a on one side of a disc 2 faces a boss portion 3 or 4 for accommodating a step 8 and both outer edges of a valve body in a direction intersecting the stem 8 from the boss portion 3 or 4. The rib portions 6 and 7 are provided so that the rib portions 6 and 7 and the boss portions 3 and 4 do not have a step in the height direction seen from the surface 2a of the disc 2 and the boss portion 3 The valve body 1 and the butterfly valve 51 of the double eccentric butterfly valve are continuously connected so as not to form a linear boundary portion on the side wall surfaces of No. 4. [Selection diagram] Fig. 1