Apparatus for coupling a branch pipe to a main

摘要

A pipe coupling apparatus C includes a coupling case 1 for surrounding an outer periphery of an existing pipe A in a sealed state. The coupling cases 1 defines a pipe coupling opening 2 for coupling a new pipe B to the coupling case 1, and an executing opening 4 for use in cutting a branching opening 3 in the existing pipe A. A lid 5 is mounted on the coupling case 1 for sealing the executing opening 4. The branching opening 3 is formed in a way to prevent a fluid from flowing out of the executing opening 4. The coupling case 1 houses a first valve 6 operable from outside the coupling case 1 to open and close the coupling opening 2, and a second valve 8 also operable from outside the coupling case 1 to move into the existing pipe A through the branching opening 3 for closing one of the passages defined by the existing pipe A and communicating with the branching opening 2.