Apparatus for testing pipes by a pipe tester

In a sealing assembly for a pipe tester or the like, in which fluid under pressure is introduced into the interior of the pipe and the ends of the pipe are sealed, comprising:

• a housing having an aperture for receiving said end of said pipe,
• sealing ring means in said aperture through which said pipe is caused to pass, constructed in a manner to be deformable in opposite axial directions and radially towards and away from said pipe such that when deformed it will contact the external circumference of said pipe to form a sealing condition,
• supporting ring means arranged concentric to said pipe and adjacent said deformable sealing ring and to one side thereof, and constructed in a manner to contact said external circumference of said pipe and to control the extent of said deformation of said sealing ring means in a said axial direction on said one side when said sealing ring means is deformed,
• means for introducing pressure against said support ring means to effect its said contact against said pipe and said deformation of said sealing ring means, and
• forming means arranged in said aperture adjacent to and on both sides of said sealing ring means in a manner to cause said sealing ring means when deformed to be displaced in said opposite axial directions with respect to said pipe, and to create a sealing surface substantially larger in said deformed condition than in said non-deformed condition of said sealing ring means.