Stainless Steel Flanged Bellows Expansion Joint

Product Overview

Stainless steel flanged bellows expansion joint (also known as an expansion loop or slip joint) is a flexible compensation component designed to absorb axial, lateral, or angular displacement in piping systems caused by thermal expansion and contraction, equipment vibration, or foundation settlement. It effectively protects the pipeline system from stress-induced damage.

This product features a high-quality stainless steel (grades 304, 316L, 321, etc.) bellows core paired with carbon steel or stainless steel flanges. It offers high pressure resistance, large compensation capacity, excellent sealing performance, and long service life. Widely used in piping systems across HVAC, petrochemical, power metallurgy, and shipbuilding industries.

Key Advantages

• Multi-directional compensation capability: Accommodates axial, lateral, and angular misalignment for complex operating conditions
• Premium Corrugated Core: Made from stainless steel materials such as SUS304, 316L, and 321, offering excellent corrosion resistance and fatigue endurance.
• Convenient flange connection: Standard flange dimensions for quick connection to pipeline flanges, ensuring easy installation and maintenance.
• High Sealing Performance: Multi-layer bellows structure with high pressure resistance and zero leak risk
• Wide range of applicationsOperating temperature: -196°C to +600°C; Pressure PN0.25 to PN4.0 MPa
• Long-lasting: Fatigue life ≥ 1000 cycles, long maintenance-free period

Technical Specifications

• Nominal Diameter: DN25~DN4000mm
• work stress: PN0.25~PN4.0MPa (vacuum~40bar)
• Operating Temperature: -196°C ~ +600°C (depends on material)
• Compensation Amount: Axial ±5~±300 mm, Radial ±5~±100 mm, Angular ±5°~±30°
• Bellows Material:SUS304, 316L, 321, 310S, 254SMO, titanium, nickel, etc.
• Flange Material: Q235, 304, 316L, 321, etc. (Customizable fluorine-lined or sprayed anti-corrosion treatments)
• Execution Standard: GB/T 12777, EJMA, ASME, EN, etc.

Typical Use Cases

• HVACExpansion compensation for thermal networks, steam pipelines, and hot water systems
• PetrochemicalVibration and noise reduction for process piping, reactor inlet/outlet connections, and pump-valve junctions.
• Electric Metallurgy: Boiler flue gas and air ducts, steam turbine exhaust piping, high-temperature medium transport
• Shipbuilding: Engine exhaust pipes, seawater desalination units, and compartment piping
• Building Water Supply and Drainage: vertical risers in high-rise buildings, fire protection piping, pump inlet and outlet