| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent breakage of a valve caused by piping displacement by arranging a circular packing on one connection parts between a coupling and a valve body or a tubular part of a flange, arranging a circular packing on the other connection part for connection, providing an escape preventive mechanism on the connection part, and enabling bending and contraction/extention. SOLUTION: A flange 2 of a valve main body 1 is formed independently on a valve body. A tubular part 2a of the flange 2 is connected to a tubular part 3a of the valve body 3 by means of a coupling 4. A connection part A between the tubular part 3a of the valve body 3 and the coupling 4 has a spherical free joint structure arranging a circular packing 7 therebetween. A connection part B between the coupling 4 and the tubular part 2a of the flange 2 has a extending/contracting double pipe structure arranging circular packings 8, 9 therebetween. The structure also has escape-preventive mechanism due to a circular projection 4e formed on an inner diameter part of the coupling 4 and a circular engagement part 2b formed on an outer diameter part of the tubular part 2a.</p> |
