Single Axial Expansion Bellow

Product Description

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?

1. 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.

2. End Connections

   • Weld Ends, Flanges, or Threaded Ends for attachment to the piping system.

3. Inner Sleeve (Flow Liner) (optional)

   • Installed inside the bellows to protect it from erosion, turbulence, or high-velocity media.

4. Outer Cover (Shroud) (optional)

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

5. Tie Rods / Limit Rods (optional)

   • Rare in single axial types because they are usually unrestrained, but can be added for safety or to limit over-compression/extension.

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 straight-line thermal movement.

Summary Table