Improved conduit stopper

摘要

A conduit stopper for selectively interrupting the flow of a fluid through an elongate conduit (32) having a continuous sidewall from which a coupon has been removed to define an aperture (34) for receiving the stopper, comprises a housing (46,50) sealingly connected to the conduit (32) surrounding the aperture (34). A deformable sealing element (180) having a pair of substantially flat sides and being adapted to be forced into sealing engagement with the interior of the conduit is mounted on carrier (146) which is moveable within the housing (46,50). A resilient seal (184,186) mounted on the carrier (146) is engageable with a portion of the continuous edge (134) defined by the aperture (34) in the conduit. The sealing element (180) cooperates with said resilient seal (184, 186) to close a portion of the elongated conduit (32) adjacent to the aperture and prevent the flow of fluid along the elongated conduit past the sealing element (180) and the resilient seal (184,186). In use, the carrier (146) is expanded to bring the resilient seal (184,186) into sealing engagement with the edge (134) of the aperture as a result of deformation of the sealing element (180) as it is forced into engagement with the interior of the conduit.