Technical Specifications

Design and Operating Principle

Weld neck expansion joints absorb axial movements occurring in pipeline systems through their stainless steel metal bellows structure. The bellows provide controlled flexibility, reducing stresses caused by thermal expansion and extending equipment service life.

Thanks to the weld neck connections at both ends, the expansion joint is directly welded to the pipeline. This structure provides high pressure resistance, maximum sealing performance, and long service life.

They can be manufactured in accordance with DIN, ANSI, and project-specific piping standards and are designed for heavy-duty operating conditions.

Performance Advantages

• High pressure resistance
• Maximum sealing performance
• Compact design due to flangeless structure
• Effectively absorbs thermal stresses
• Reduces loads on pipelines and equipment
• Reliable solution for high-temperature applications
• Long service life
• Low maintenance requirement

Operating Values

Operating Pressure

• Maximum 63 bar
• (depending on DN size, bellows layers, and design)

Operating Temperature

• -196°C / +600°C
• (depending on bellows and pipe material)

Movement Capabilities

• Axial Movement: ±10 mm – 60 mm
• Lateral Movement: Limited
• Angular Movement: Limited

Note: Weld neck expansion joints are primarily designed to absorb axial movements. For applications with significant lateral or angular movements, different expansion joint types should be preferred.