| 摘要 |
<p>Provided is a valve element of a butterfly valve, wherein the rigidity of the valve element is increased, the operation torque of the butterfly valve is reduced, and the operation of the butterfly valve is facilitated. A cylindrical portion extending diametrically is formed on the center of a disk-shaped base plate constituting a valve element so that the cylindrical portion protrudes on the front and back sides of the base plate. A valve shaft insertion hole is provided in the cylindrical portion, and a plurality of circular ribs intersecting and in contact with the cylindrical portion are coaxially projected on the front and back sides of the base plate. Furthermore, the outermost peripheral rib is disposed along the edge of the base plate, and the outer diameter of the center of the cylindrical portion is larger than the outer diameter of an end of the cylindrical portion.</p> |
