| 摘要 |
A check body is joined to the high pressure side of a wall in a sleeve, the wall containing a peripheral line of weakness The plug comprises an externally threaded sleeve (1) integrally combined with a cross-direction wall (2) that contains a line of weakness (6) extending around the wall periphery. Also present in the plug is a check body (7) joined to the wall within the region defined by the line of weakness, and on the side of the wall which is subjected to the higher pressure. The diameter of the check body at a distance away from the wall is greater than the region defined by the line of weakness. |
