Latest universal bellows are provided by Athulya Bellows & Engineering. Technical specifications: dimensions of 2800 NB x 4000 mm long, axial movement of ± 100 mm, and lateral movement at ± 100 mm. Two bellows of the universal expansion joint are alienated by a pipe section or spool. The amount of lateral deflection depends on amount of angulation each bellows can absorb and the distance between the bellows. By connecting the ends of the unit the tie rods restrain the pressure thrust load. Generally these units cannot accept any externally applied axial deflections. Bellows element handles the distance between the tie rods. Tie rods usually come in sets of two or more, equally distributed around the circumference of the expansion joint. When only two are provided 180-degrees apart, the expansion joints are free to bend, or deflect angularly, as well as laterally.
