Universal Bellow Expansion Joint

Two single bellows connected with common pipe connector become Universal Bellow Expansion Joint. Such Bellow Expansion is designed to absorb lateral movement along with axial movement and angular movement.

Lateral compensation is likewise associated with a redirection of flow by 90° within single-plane or multi-plane piping systems. Usually, lateral expansion joints are installed in existing right-angle redirections in the system. The movement of a lateral expansion joint always consists of the desired lateral movement and a slight unavoidable axial movement that comes from the expansion joint itself.

Simple lateral expansion joints for lateral movements in one plane only permit a far larger expansion absorption than axial expansion joints. Lateral expansion joints that are movable in all planes simultaneously absorb expansion from two pipe sections in different directions.

The following basic rules apply to lateral compensation:

  • In accordance with the movement type, lateral expansion joints are always arranged at right angles to the pipeline being compensated, which means that lateral compensation is always associated with a redirection in flow.
  • Relief of the fixed points from compressive forces, as is the case for angular expansion joints.
  • If the system is "fully compensated", the unavoidable, small axial movement of lateral expansion joints is absorbed by an additional lateral expansion joint. However, often the pipeline itself can compensate this through elastic bending. In this case, adequate bearing play must be provided in the pipe guides.
  • Lateral expansion joints permit angular movement around the bolts and hinge axes. This can be used to absorb pipe sag between the pipe supports. Lateral and angular expansion joints are frequently combined in three-hinge systems.

The compensation type that is selected depends on which method is the most cost-effective and which provides the best solution for the function that needs to be fulfilled. An economic consideration should not merely take into account the cost of the expansion joints themselves, but should also include the required anchors, pipe supports and shaft structures.

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