| 摘要 |
<p>PURPOSE:To surely prevent corrosion and a leak of pipe inner fluid to the outside from occurring by installing an annular uneven part on an inner end working face of an anticorrosive core. CONSTITUTION:A coupling body 3 with a thread part 4 for a connected pipe, and a resin anticorrosive core 5 with a tubular part 5a for forming an annular interval part 15 for fitting the connected pipe in a gap with the thread part 4 both are installed in an end part opening 3a. In addition, a tubular insert part 8 is installed in an inner part of the coupling body 3. In this constitution, an inner end working face 6 of this insert part 8 presses an inner end face 7 of the resin anticorrosive core 5 under pressure. In succession, an annular uneven part 22 is formed on the inner end working face 6.</p> |
