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What is the difference of the expansion joint at the elbow, one with expansion joint at the outside of elbow and the other without it?

The bellows outside the elbow is called the balancing bellows. This bellows compensates for the movements. The elbow acts as an intermediate anchor and the tie rods absorb all of the pressured thrust forces.

Tied Universal Expansion Joint with Elbow
Tied Universal Expansion Joint with Elbow

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