TRIPLE-EXPANDED MECHANICAL PIPE COUPLING DERIVED FROM A STANDARD FITTING

摘要

A method of making a coupling for joining pipe segments is disclosed. The method includes providing a fitting with a socket for receiving a pipe end. A first region of the fitting adjacent to the socket is expanded to a larger diameter than the socket. A second region of the fitting adjacent to the first region is expanded to a larger diameter than the first region. A third region of the fitting adjacent to the second region is expanded to a larger diameter than the second region. A sealing member is positioned in the first region, a retainer is positioned in the second region and a support washer is positioned in the third region. A lip is turned inwardly on the third expanded region to capture the components within the coupling.