- universal expansion joint
- a universal expansion joint is one containing two bellows joined by a common connector for the purpose of absorbing any combination of the three basic movements, i.e. axial movements, lateral deflection, and angular rotation. Universal expansion joints are usually furnished with control rods to distribute the movement between the two bellows of the expansion joint and stabilize the common connector. This definition does not imply that only a universal expansion joint can absorb combined movements.
Mechanics glossary. 2013.
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control rod — devices, usually in the form of rods or bars, attached to the expansion joint assembly whose primary function is to distribute movement between the two bellows of a universal expansion joint. Control rods are not designed to restrain pressure… … Mechanics glossary
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