Patent ID: 7314239

Claim:
A tube device including a casing, and a device element which is placed in said casing, wherein said casing comprises: a tube made of a synthetic resin; a pair of lid members which are made of a synthetic resin; a pair of union nuts which are made of a synthetic resin and which are fitted onto one and other end portions of said tube, and which are screwed to end portions of said lid members, respectively; and a sealing portion which is formed in at least one place for each of said end portions of said tube by closely contacting said end portion of said tube with said sealing face of corresponding one of said lid members, said end portion of said tube and said sealing face of said lid member being closely contacted with each other by causing corresponding one of said union nuts to press said tube from an outside of said tube, said union nut fastening said end portion of said lid member by screw advancement toward said end portion of said lid member; thereby pressing said tube from the outside of said tube, wherein said device element is a heat exchange tube which is made of a synthetic resin, and in which an outer periphery is surrounded by said tube made of synthetic resin and connecting portions which are disposed on said pair of lid members made of a synthetic resin, and to which outlet ports of said heat exchange tube, and pipes for introducing and discharging a fluid that is passed between an inner side of said casing and an outer side of said heat exchange tube are connected, respectively.