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Expansion Joints
Rectangular Expansion Joint

Rectangular Expansion Joint

Here you can learn about how rectangular expansion joints work, their key advantages, technical specifications, and typical industry uses - and browse our full range of products.

How do rectangular expansion joints work? 
Rectangular expansion joints are designed to absorb movement and vibration in ducting and non‑circular piping systems. They use a flexible metallic, fabric, or elastomeric bellows section formed into a rectangular shape, allowing axial, lateral, and angular deflection while maintaining a seal between connected sections.
Advantages of rectangular expansion joints...
• Designed for ducting and non‑circular systems
• Absorbs thermal expansion and misalignment
• Reduces vibration and noise transmission
• Can be built for very large cross‑section sizes
• Available in metallic, fabric, or rubber construction
Technical Parameters:
Movement Range
Typically ±25 mm to ±100 mm axial movement (larger on request) Lateral movement up to ±50 mm Angular movement up to 15°
Size Range
Custom‑built to suit rectangular or square ducting - from small HVAC sections to multi‑metre industrial ducts
End Connection Types
• Flanged (to suit ducting flange standards) Weld‑end
• Bolt‑on frame designs
Bellows Design
Metallic: stainless steel single‑ply or multi‑ply. Fabric: multi‑layer high‑temperature fabrics with insulation. Rubber: reinforced elastomer with fabric/steel cord layers
Cycle Life
Designed for thousands of thermal or mechanical cycles, depending on movement magnitude and operating conditions
Materials
Metallic: stainless steel 304 / 321 / 316L bellows, Fabric: PTFE, glass fibre, Kevlar®, ceramic cloth, Rubber: EPDM, nitrile, neoprene, natural rubber, End fittings: carbon steel, stainless steel, alloy steels
Optional Features
Internal liners - protect from gas flow turbulence/erosion. External covers - shield from weather or mechanical damage. Thermal insulation layers for high‑temperature gas streams. Tie rods or limit rods - control movement and prevent over‑extension
Industry Application:
EFW
Oil & Gas
Power
Media Type:
Water
Gas
Steam
Oil
Chemicals

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View products

HLS Rectangular Expansion Joints
Hels®
Overview:
Industry Use:
Nuclear
EFW
Oil & Gas
Power

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