Lens Expansion Joints

Overview

Lens expansion joints are single-walled metal expansion joints manufactured in single or multi-shaft configurations. They are specifically designed for applications requiring limited movement but extremely robust construction, particularly under high pressure and high temperature conditions.

Design & Construction

• Single-layer metal bellows construction
• Formed from one or more semi-circular plates
• Welded with circular seams at corrugation peaks and troughs
• Available as half convolution, full convolution, or complete bellows

Material & Thickness Considerations

• Designed for applications requiring single-layer bellows
• Ideal when required material thickness exceeds 4 mm
• Alternative to multi-layer bellows where multi-layer designs are not accepted

Supply Configuration

• Supplied as individual lens elements or fully assembled bellows
• Can be delivered pre-welded or suitable for on-site welding
• Configuration tailored to customer and application requirements

Key Advantages

• Extremely robust construction for high-pressure service
• Suitable for high-temperature environments
• Allows use of thick single-layer material where standard bellows are not feasible
• Reliable solution when multi-layer bellows are not acceptable
• Long service life under severe operating conditions

Applications

• Pressurized equipment
• Heat exchangers
• High-pressure piping systems
• High-temperature industrial processes
• Power generation and heavy industry

Typical Use Cases

Lens expansion joints are preferred in industries where operating pressures and temperatures demand thick, single-layer bellows that cannot be manufactured using conventional expansion joint designs.