| 摘要 |
Devices are described which are adapted to be positioned between a pair of plain faced pipe or other flanges having a plurality of evenly spaced, oversize bolt holes to receive a like number of bolts to hold the flanges together. The devices are provided with a plurality of camming surfaces adapted to bear against the bolts and force them into a limiting position of their radial travel permitted by the clearance of the oversize bolt holes around the bolts, thus axially aligning the flanges.
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