Bolt tensioner for clamping pressure vessel cover - has nut running unit and hydraulically actuated piston which seats around bolts

摘要

The clamping arrangement is used for bolts on a pressure vessel cover. The reversing piston is a floating hollow piston enclosing the bolt. This piston acts on the upper end face (16) of the upper piston (13). Above the latter is arranged another cylindrical limiting piston (21) whose stroke is limited by a stop. The hollow piston (20) and the limiting piston (21) are guided between a circular projection of a part (17) of the support (4) and the upper cylinder (15).