To provide an expansion union joint structure allowing the replacement of packings without forcibly moving pipes after installed and having high sealing performance, and to provide a fluid transfer pipe system using the same.
The expansion union joint structure comprises a union nut opened at one side and bag-shaped at the other side, a union collar to be inserted into the bag-shaped side of the nut and connected to one pipe, a union screw to be inserted into the union collar at the opened side of the nut via a first packing, a pipe connection member to be inserted into the union screw and connected to the other pipe, and a second packing provided between the union screw and the pipe connection member. The movement of the union screw to the axial direction and the replacement of the first and second packings are allowed by loosening the union nut.
KISHIMOTO KENJI
YASU HIDEYUKI
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