| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the rotation of an eye union associated with the fastening of a bolt and to always maintain the orientation of a pipe to a fixed direction by restraining the co-rotation of a ring-shaped portion located at a bolt side by an other ring-shaped portion, even if frictional force at the ring-shaped portion located at the bolt side is applied by fastening the bolt. SOLUTION: When the bolt is fastened, the co-rotation of the ring-shaped portion located at the bolt side is restrained by setting the contact area of the ring-shaped potion located on the bolt side with a pipe connection element to be smaller than the contact area of the other ring-shaped portion with the pipe connection element.</p> |
