Watertight testing device for a pipe joint part

A watertight testing device for conducting a watertight test on a pipe joint part in which a socket of one pipe receives an inserted spigot of another pipe, the pipe joint part being provided with a seal member between an inner surface of the socket and an outer surface of the inserted spigot, the watertight testing device comprising:

• a cylindrical core fitted into the pipe joint part;
• an annular first seal member for sealing between an outer surface of the cylindrical core and an inner surface of the one pipe;
• an annular second seal member for sealing between the outer surface of the cylindrical core and an inner surface of the other pipe;
• a first pressing member for pressing and compressing the annular first seal member into a first seal-member insertion space formed between the outer surface of the cylindrical core and the inner surface of the one pipe;
• a second pressing member for pressing and compressing the annular second seal member into a second seal-member insertion space formed between the outer surface of the cylindrical core and the inner surface of the other pipe;
• a moving device for moving the first and second pressing members in a pipe axial direction;
• and
• a test fluid feeder for feeding a test fluid into a test space formed between the outer surface of the cylindrical core and the inner surfaces of the one pipe and the other pipe in a pipe diameter direction and between the annular first seal member and the annular second seal member in the pipe axial direction,
• wherein a first engagement recess formed in the annular first seal member is engaged with a first engagement protrusion of a first pressing part of the first pressing member, and
• wherein a second engagement recess formed in the annular second seal member is engaged with a second engagement protrusion of a second pressing part of the second pressing member.