A seat ring for a butterfly valve and a butterfly valve having the same

摘要

The seat ring 15 for the butterfly valve 11 is mounted on the inner circumferential surface of the inner flow path extending along the flow path axis in the valve body 13 of the butterfly valve 11, The outer circumferential surface of the valve element 17, which is pivotally supported by the shaft 19 in a rotatable manner, comes into contact with the inner circumferential surface. The seat ring 15 is provided with a ring body 15a having a cylindrical shape extending in the central axis direction and is provided at a position facing the ring body 15a in the radial direction, Shaped protrusions 23 and 23 extending in the circumferential direction are spaced apart from the pair of through holes 15c and 15c on the outer circumferential surface of the ring body 15a Respectively.