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U.S. Bellows U.S. BELLOWS, INC.
FABRIC EXPANSION JOINT CATALOG
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Movement of Fabric Expansion Joints

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Directional Movement for Fabric Expansion Joints

Fabric Expansion Joint Diagram Showing Axial Compression

Axial Compression

The reduction in the breach opening along the axis of the duct. This is usually a result of thermal expansion of the ducting.

Fabric Expansion Joint Diagram Showing Axial Extension

Axial Extension

The increase in the breach opening along the axis of the duct. In certain configurations, the duct thermal expansion may result in extension at the expansion joint location.

Fabric Expansion Joint Diagram Showing Laterial Movement

Lateral Movement

The relative movement of the upstream and downstream faces in the direction perpendicular to the axis of the duct.

Fabric Expansion Joint Diagram Showing Torsional Rotation

Torsional Rotation

The twisting of one side of the duct about the longitudinal axis.

Fabric Expansion Joint Diagram Showing Angular Rotation

Angular Rotation

The twisting of one side of the duct about an axis perpendicular to the longitudinal axis.



Fabric Expansion Joint Movement Chart

Fabric Expansion Joint Movement ChartFabric Expansion Joint Movement Illustration

The chart shown above depicts the relationship of belt span, maximum compression and concurrent lateral movements. The maximum compression is a percentage of the available belt span (shown as the right end of the plot line). The wider the span, the more capacity for compression. The lateral capacity is a function of the belt slack created with concurrent compression.

As the compression increases, more belt material is available to safely allow movement without overstressing the fabric material. In situations with large lateral movement and little compression, the joint can be installed pre-compressed to have more lateral capacity.

When in doubt, allow experienced U.S. Bellows engineers to help select the correct span for each particular application.

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