FLARELESS PIPE COUPLING STRUCTURE, FLARELESS PIPE COUPLING METHOD, AND ON-SITE PIPE COUPLING METHOD

摘要

A guide taper surface (17) of a flareless pipe coupling structure of a pipe coupling port (16) comprises a small-diameter part (17a) guiding the end part (3a) of a flareless sleeve (3) so as to be bitten into a coupled pipe (5) and a large-diameter part (17b) fitted to the tapered outer peripheral surface (33) of the flareless sleeve (3) for sealing. The tilt angle E1 of the small-diameter part (17a) to the center axis of the guide taper surface (17) is larger than the tilt angle E2 of the large-diameter part (17b) to the center axis. Consequently, even when the end part of the coupled pipe (5) is not inserted into the deepest position of the pipe coupling port (16), excellent seal performance can be provided to the structure at the portion of the bite type sleeve connected to the connection pipe.