TUBE JOINT CONSISTING OF RESIN

摘要

A tube joint consisting of a resin, the tube joint being economically constructed from two parts which are a joint body and a union nut and having both high pull resistance and excellent sealing performance which are achieved at the same time. The tube joint comprises a fluorocarbon resin joint body (1) and a fluorocarbon resin union nut (2).  The fluorocarbon resin joint body (1) is provided with an inner tube section (4) and a male thread section (5).  The fluorocarbon resin union nut (2) is provided with a female thread section (8), a sealing peripheral edge (10) capable of acting on a front end section of an expanded diameter tube section (3A), a come-out preventing peripheral edge (11) acting on a large diameter-side end portion of an expanding diameter region (9), and a pressing inner peripheral section (13) capable of being fitted over an expanded diameter straight section (12) fitted over a straight tube portion (4B).  When the union nut (2) is tightened in a state in which an end of a tube (3) can be inserted into the inner tube section (4) to form the expanded diameter tube section (3A), the pressing inner peripheral section (13) is made to be in pressure contact with and fitted over the expanded diameter straight section (12), that portion of the expanding diameter region (9) which is to be the large diameter-side end portion is pressed by the come-out preventing pressing section (11), and a small-diameter-side end portion of the expanding diameter region (9) is pressed by the sealing pressing section (10).