There is disclosed a socket for a pipe coupling, comprising a hollow cylindrical
socket body including a plug insertion port, a radially movable locking element
to lock a plug in the plug insertion port, and a sleeve attached to the socket
body so as to be movable forwards/backwards and can operate the locking element.
A valve body including a channel hole and purge hole is fixed in the socket body,
and a cylindrical seal member rotatable between a first position and a second position
is attached between the socket body and valve body. The seal member opens the channel
hole and closes the purge hole in the first position, and vice versa in the second
position. The seal member is connected to a sleeve for valve opening/closing operation
rotatably attached to the socket body by a connection pin inserted through a circumferential
groove in the socket body.
