Bellows Movements

BELLOWS MOVEMENTS There are four basic movements that can be applied to a bellows. These are Axial, Lateral, Angular, and Torsional. The below figures illustrate these movements. Bellows behave like springs in a piping system. When they are compressed, the bellows resist the movement the same as a spring would. The spring rate of a bellows is entirely dependant on bellows geometry and material properties. We are able to vary bellows geometry such as convolution height, pitch, thickness, and the number of plies to provide a bellows to satisfy any customer’s needs. Axial Movement Axial movement is the change in dimensional length of the bellows from its free length in a direction parallel to its longitudinal axis. Compression is always expressed as negative (-) and extension as positive (+). The units for axial spring rates displayed in N/mm. ▲ Axial Movement (+/- In) ▲ Single Tied Expansion Joint for Axial Movement Angular Movemen...