Compressor RotorInstead of a solid sleeve, mechanical expansion bolts use a split sleeve which is operated mechanically instead of with high-pressure hydraulics. The split sleeve mates with the machined coupling hole and requires less tolerance on mating parts than is traditionally required with interference fit bolts. Since the sleeves are installed in clearance conditions and are expandable, the mechanical bolt can accommodate slight hole size variations and hole misalignment .They are suitable for couplings using bolts of 1-1⁄8" (28mm) diameter or bigger. this suggests that a particular radial force is imparted into the opening .Designers can calculate the precise radial force needed for optimal expansion. This increases the reliability of the coupling and successively , the appliance during which it's installed. Reliable coupling bolts provide correct driving forces, are easily installed and removed without worrying of galling or seizing and supply accurate maintenance scheduling.
