| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To surely perform the sealing by preventing the leakage of pressure fluid in a pipe from a clearance between a barrel part and a screw part of a hole saw with a simple structure, in a service tee fitting constituted by a joint main body composed of a saddle part welded and joined with a pipe composed of a plastic pipe, and the barrel part projecting from the saddle part, a spigot projected from the barrel part to a side part and connected with a branch pipe, and the hole saw for pipe boring, screwed into the barrel part. <P>SOLUTION: A circular flange 21 is thermally adhered or integrally molded to an inner periphery of an upper end of the barrel part 3, a circular groove 25 is formed on a peripheral edge of an upper end face of the hole saw, and an O-ring 26 is mounted therein to seal between the flange 21 and the upper end face of the hole saw. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
