| 摘要 |
The present invention provides a pipe coupling socket that enjoys improved safety when connected to a plug. This socket comprises a socket body (2) containing a ball valve (8) and having locking elements (17) at its distal end portion, a valve control sleeve (11) fitted on the outer peripheral surface of the socket body for axial movement and capable of actuating the ball valve, a plug connecting sleeve (19) fitted on the outer peripheral surface of the socket body for axial movement and capable of locking and unlocking the plug with the aid of the locking elements, first lock means which prevents the advance of the plug connecting sleeve, second lock means which prevents the retreat of the plug connecting sleeve and the advance of the valve control sleeve, and third lock means which prevents the retreat of the plug connecting sleeve and the valve control sleeve. <IMAGE> |
