What are Tie rods? Why do we need them ?

TieRods are devices, in the form of rods or bars that are attached to the expansion joint assembly whose primary function is to continuously restrain the full bellows pressure thrust during normal operation while permitting only lateral deflection.

Angular rotation can be accommodated only if 2 tie rods are used, located 90 deg opposed to the direction of rotation.

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Pressure-Balanced Expansion Joint

A pressure-balanced expansion joint is designed to absorb axial movement and/or lateral deflection while restraining the pressure thrust force of the bellows. This is done by means of interconnecting the flow bellows with an opposed bellows also subjected to a line pressure. 

This type of expansion joint is usually used when a change in direction usually occurs in a run f the pipe.

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Double Expansion Joint

A double expansion joint consists of two bellows joined together using a common connector anchored to a rigid part of the installation using an anchor base. The anchor base is attached to the common connector either at the time of installation or at the time of manufacturing. The anchor base allows each bellows of the assembly to work independently as a single unit. Double expansion joints look similar to an universal expansion joint but should not be confused with it.

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