Single Axial Expansion Bellow

About Single Axial Expansion Bellow

A Single Axial Expansion Bellow or Axial Expansion Joint is the simplest type of expansion joint used to absorb axial movement movement along the axis of the pipe caused by thermal expansion or contraction in piping systems

What Does a Single Axial Expansion Bellow Contain

Bellows Element

A corrugated flexible metallic structure commonly stainless steel designed to expand or compress along the pipes axis

Provides the flexibility required to accommodate thermal growth

End Connections

Weld Ends Flanges or Threaded Ends for attachment to the piping system

Inner Sleeve Flow Liner optional

Installed inside the bellows to protect it from erosion turbulence or highvelocity media

Outer Cover Shroud optional

Protective cover to safeguard the bellows from external damage and weather conditions

Tie Rods Limit Rods optional

Rare in single axial types because they are usually unrestrained but can be added for safety or to limit overcompressionextension

Main Characteristics

Movement Absorbed Axial only not designed for lateral or angular movement

Unrestrained Requires strong anchors and proper guides in the piping system to control pressure thrust

Compact Design Simple and economical for straightline thermal movement

Summary Table

Component Function

Bellows Element Absorbs axial expansioncontraction

End Connections Connects to pipeline

Inner Sleeve Protects bellows from flow turbulence

Outer Cover Shields bellows from external damage

TieLimit Rods Optional Provides movement control or safety restraint