| 摘要 |
This invention contemplates a resettable plug assembly (30) suitable for insertion into a pipeline from a transverse tee connection in order that flow may be stopped and pressure retained by the plug. The stopper plug is inserted in the upstream direction and utilizes a bypass valve to aid installation when there is flow. The seal (20) of the plug is expanded radially to contact the wall of the pipeline for sealing. Once in place the bypass valve is closed to stop the flow in the pipeline. |
