At first glance, many people may consider expansion joints and metal bellows to be one and the same. Sometimes the terms are used interchangeably in conversation. However, slight distinctions between the two exist.
So when it comes down to the debate between expansion joints versus bellows, you may well ask, “What’s the difference?” In this article, you’ll discover a few details regarding both terms, including their function and how they work together.
Expansion Joint
Expansion joints, also known as compensators, are devices installed in machines, containers, and pipelines. A standard expansion joint may have connectors and tie rods at both sides that differ depending on their application.
Expansion joints see usage in various industry settings like the paper, chemical, and water treatment industries. Where there’s a pipeline, you’ll find expansion joints, as they help mitigate the effects of thermal movements and vibrations.
nylon flexible wire loom corrugated bellow conduit hose pipe
Metal Bellows
Metal bellows are the flexible elements of the complete joints. This portion of the expansion joint is typically cylinder-shaped and consists of thin, rolled sheets of metals.
The bellows have circumferential convolutions that absorb movement as drastic temperatures run through the expansion joint.
- Axial movement: Axial movement changes the length of the bellows along the longitudinal axis.
- Angular movement: Angular movement bends the bellows longitudinal axis to form an arc. During this movement, convolutions are compressing at the innermost section.
- Lateral movement: During lateral movement, there is a slight displacement of end to the other end that sits perpendicular to the longitudinal axis.
Final Thoughts
To dispel the confusion regarding the difference between expansion joints versus bellows, it helps to become familiar with the basic terminology. This meaningful detail may also aid in the proper care and maintenance of components, resulting in their prolonged service life.