RESIN PIPE JOINT

摘要

Provided is a resin pipe joint which is improved to have excellent assembling workability and handling performance by making it possible to check that a union nut has been tightened or almost has been tightened even when the pipe joint portion is invisible or difficult to recognize, and even at a noisy job site.  A resin pipe joint is configured in such a manner that a diameter enlargement region (9) is pressed by a seal press portion (10) when a union nut (2) advances by screwing as a female screw (8) is screwed into a male screw (5) under a state where a tube (3) is fitted over an inner tube (4) to form a enlarged diameter portion (3A), wherein a torque variation portion (26) is configured so that the protrusion (20) of the joint body (1) and the recess (19) of the union nut (2) are fitted to or separated from each other by the flexural displacement of the protrusion (20) in the direction of the central axis (P) thereof when the seal press portion (10) presses the diameter enlargement region (9) to cause the turning and tightening of the union nut (2) that occurs approximately ahead of the end of the advancing by screwing of the screw nut .