Zhengda Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Rectangular Metal Bellows Expansion Joint
Key Features
Technical Specifications
| Nominal Size (mm) | Length (mm) | Width (mm) | Height (mm) | Flange Thickness (mm) | Bolt Hole Diameter (mm) | Bolt Quantity | Axial Movement (mm) | Lateral Movement (mm) |
|---|
| 300×400 | 400 | 500 | 150 | 10 | 18 | 12 | ±20 | ±15 |
| 400×600 | 500 | 700 | 180 | 12 | 18 | 16 | ±25 | ±20 |
| 500×800 | 600 | 900 | 200 | 14 | 22 | 20 | ±30 | ±25 |
| 600×1000 | 700 | 1100 | 220 | 16 | 22 | 24 | ±35 | ±30 |
| 800×1200 | 900 | 1300 | 250 | 18 | 26 | 28 | ±40 |
| Parameter | Unit | Value |
|---|---|---|
| Working Pressure | MPa | 0.1~2.5 |
| Burst Pressure | MPa | ≥1.5×Working Pressure |
| Temperature Range | °C | -20 ~ +450°C |
| Vacuum Resistance | kPa | ≥53.3 |
| Axial Movement | mm | ±20~±50 (based on design) |
| Lateral Movement | mm | ±15~±40 (based on design) |
| Angular Deflection | Degrees | 3°~8° |
| Applicable Media | – | Air, Hot Gas, Exhaust, Corrosive Gas |
| Component | Material Options |
|---|---|
| Bellows | Stainless Steel (304, 316, 321) |
| Flanges/End Fittings | Carbon Steel, Stainless Steel |
| Tie Rods | Carbon Steel (Zinc Coated), Stainless Steel |
| Internal Sleeve | Stainless Steel, Carbon Steel (optional) |
Inspect for damages before installation.
Align flanges accurately with mating pipes.
Use appropriate gaskets between flanges.
Tighten bolts evenly in cross pattern.
Avoid over-tightening bolts to prevent deformation.
Ensure bellows is not twisted during installation.
Periodically inspect for signs of leakage or corrosion.
Check bolts for proper torque periodically.
Ensure joints are free from obstruction.
Replace immediately if bellows show significant damage or deformation.
Regular maintenance intervals recommended every 6-12 months depending on operating conditions.
What documents are included with the shipment?
We provide a full set of export documents, including packing list, commercial invoice, inspection report, and welding material certificate. Custom clearance documents can be issued on request.
What sizes and materials are available for rectangular metal bellows?
Our rectangular metal bellows are custom-made in a wide range of sizes, typically from 200×300mm up to 2000×3000mm. Materials include stainless steel 304, 316L, or 321. Frame materials can be carbon steel or stainless steel depending on customer requirements.
Can you manufacture expansion joints based on our drawing?
Yes, we specialize in custom fabrication. Just send us your CAD drawing or design specs — our engineering team will provide a tailored solution with professional technical support.
Why Choose Zhengda Valve & Pipeline Co., Ltd.?
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