| 摘要 |
<p>A pipe coupling comprises a pair of flanges adapted to be secured together in face to face relation to form a fluid-tight coupling. Each said flange (2) incorporates at least one coding device (5, 22) formed to provide a key and a keyway, which coding devices are so disposed and arranged on said flanges that the two flanges can only be secured together to form a said fluid-tight coupling if the coding devices on the respective flanges correspond with one another, and each of a said pair of coding devices comprising, secured within a hole (22) in a said flange, a bar member (5) whose cross section is partly cut away to provide a said keyway and key, and means for securing said bar member in said hole in one of a predetermined number of relative orientations, selectively achieved by adjusting, by rotation, the bar in its hole.</p> |
