Single Axial Stainless Steel Metal Bellows Expansion Joint
DN80-DN300
The Single Axial Stainless Steel Metal Bellows Expansion Joint is a precision-engineered flexible component designed to absorb axial movement, dampen vibration, and compensate for thermal expansion in piping systems. Constructed entirely from high-grade stainless steel, this unit offers exceptional durability, corrosion resistance, and reliable performance in demanding industrial environments.
Delivery
FOB
minimum order
3 pieces
Supply Ability
100pieces / Month
Country of Origin
CHINA
Stock Time
30Day
Quantity:
US $150.00 - US $1000.00
/ pieces
Design & Construction
This expansion joint features a single, hydraulically-formed or welded metal bellows as its primary flexible element. The bellows are manufactured from multi-ply stainless steel sheets to ensure optimal cycle life and pressure containment. Standard construction includes integral end fittings—typically weld ends, flanges, or threaded connections—that provide a secure, leak-tight interface with the piping system. Internal liners (optional) can be incorporated to reduce flow turbulence and protect the bellows from abrasive media, while external covers (optional) offer protection against mechanical damage.
This expansion joint features a single, hydraulically-formed or welded metal bellows as its primary flexible element. The bellows are manufactured from multi-ply stainless steel sheets to ensure optimal cycle life and pressure containment. Standard construction includes integral end fittings—typically weld ends, flanges, or threaded connections—that provide a secure, leak-tight interface with the piping system. Internal liners (optional) can be incorporated to reduce flow turbulence and protect the bellows from abrasive media, while external covers (optional) offer protection against mechanical damage.
Functional Characteristics
Axial Compression & Extension: Engineered to primarily accommodate linear movements along the pipe axis, effectively relieving stress caused by thermal growth or pipe settling.
Vibration Isolation: The corrugated profile dampens mechanical vibrations and pulsations, reducing noise transmission and protecting sensitive equipment such as pumps and compressors.
Misalignment Compensation: While designed for axial movement, this unit can also accommodate minor lateral or angular deflections under specific installation conditions.
Materials of Construction
Bellows: Austenitic stainless steels (e.g., AISI 304, 316L, or 321) to provide excellent resistance to oxidation, pitting, and stress corrosion cracking. Higher alloys (e.g., Inconel or Hastelloy) are available upon request for aggressive chemical or high-temperature services.
End Fittings & Hardware: Matching stainless steel grades to ensure metallurgical compatibility and prevent galvanic corrosion.
Optional Liners & Covers: Available in stainless steel or specialized alloys for enhanced service life.
Performance Specifications
Pressure Rating: Designed for a wide range of pressures, from low vacuum up to high-pressure classes (e.g., ANSI 150, 300, or higher) depending on bellows geometry and wall thickness.
Temperature Range: Capable of continuous operation from cryogenic temperatures (-196°C) up to elevated temperatures exceeding 600°C, limited only by the selected alloy.
Movement Capacity: Customizable axial stroke lengths to suit specific system displacement requirements.
Cycle Life: Manufactured to meet rigorous fatigue life standards based on EJMA (Expansion Joint Manufacturers Association) guidelines, ensuring predictable long-term performance.
Application Fields
Power generation (steam lines, turbine exhausts)
Petrochemical and refinery process piping
HVAC and district heating systems
Marine and offshore platform services
Pharmaceutical and food processing (sanitary configurations)
Exhaust and emission control systems
Quality Assurance
Each expansion joint undergoes a series of rigorous inspections, including dimensional verification, pneumatic or hydrostatic pressure testing, and, when required, non-destructive examination (dye penetrant, radiographic, or helium leak testing). All units are supplied with a material test certificate (EN 10204 3.1 or 3.2) and a comprehensive test report.
Each expansion joint undergoes a series of rigorous inspections, including dimensional verification, pneumatic or hydrostatic pressure testing, and, when required, non-destructive examination (dye penetrant, radiographic, or helium leak testing). All units are supplied with a material test certificate (EN 10204 3.1 or 3.2) and a comprehensive test report.
Customization Options
To address unique system requirements, we offer tailored design modifications, including:
To address unique system requirements, we offer tailored design modifications, including:
Variable number of bellows convolutions
Special flange drilling patterns or weld end preparations
Integral flow liners for erosion protection
External tie rods or limit stops (when converting to a restrained design)
Purge or leak detection connections for double-ply configurations
Installation & Maintenance
Proper installation, including alignment checks and the use of guiding supports, is critical to ensure maximum service life. Routine inspection intervals are recommended to monitor for surface pitting, foreign object damage, or flange gasket integrity.
Proper installation, including alignment checks and the use of guiding supports, is critical to ensure maximum service life. Routine inspection intervals are recommended to monitor for surface pitting, foreign object damage, or flange gasket integrity.
For detailed engineering drawings, load calculations, and specific project consultation, please contact our technical sales team. We are committed to providing cost-effective, high-integrity solutions for your pipeline stress management needs.
