Expansion Joints

Universal expansion joints contain two bellows with multiple convolutions joined by a center pipe or spool. These joints, also known as double or tandem bellows expansion joints are used for the purpose of absorbing any combination of axial, lateral, or angular movements in a piping system. When lateral movements are too excessive for a single axial expansion joint to accommodate or when there is a limitation on the amount of lateral forces allowed on the connecting piping or equipment, universal expansion joints are installed to accommodate these movements. Universal types can be supplied with or without tie rods. Tie rods connect the ends of the unit to each other and restrain the pressure thrust load. This unit is normally not expected to accept any externally applied axial deflections. The tie rods usually come in sets of two or more, equally distributed around the circumference of the expansion joint.