Patent ID: 9074708
Filing Date: 2015-07-07
Classification: F16L

Abstract:
1. A double-pipe joint wherein said double-pipe joint has an inner joint portion and an outer joint portion, said inner joint portion having: said inner joint portion being used for connecting and coupling an inner pipe of a double pipe to said inner-pipe joint body, said double pipe comprising an outer pipe, which is made of a synthetic resin, and said inner pipe, which is disposed inside said outer pipe and made of a synthetic resin, said outer joint portion having: said outer joint portion being used for connecting and coupling said outer pipe to said outer-pipe joint body with which said inner-pipe union nut is formed integrally, said inner-pipe sleeve having: said inner peripheral face being in press contact with a forward-contracted tapered outer peripheral face of an annular protrusion which has said tapered outer peripheral face in a tip end, said tapered outer peripheral face being formed on an outer diameter side of a fluid path of said inner-pipe joint body, said inner-pipe sealing portion being formed by so that said inner-pipe sealing portion pressingly holds the end portion of said inner pipe in an inclined state between said inner-pipe sealing face and said inward taper face, and said pipe joint further having a second inner-pipe sealing portion which is configured in a freely formable manner by pressing contact between said tapered inner peripheral face and said tapered outer peripheral face.