Zhengda Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Thrust-Free Expansion Joint
Thrust-Free Expansion Joints are specially designed to absorb axial movement in pipeline systems without transferring axial thrust forces to adjacent equipment or structures. These joints are commonly used in applications where fixed anchors are difficult to install or where structural integrity is critical, such as in municipal pipelines, pump outlets, and long-distance water transmission systems.
Manufactured with high-quality steel and precision-welded bellows, our thrust-free expansion joints are equipped with internal sliding sleeves or double bellows combined with tie rods to ensure stability under internal pressure while allowing effective expansion and contraction. The compact design allows for easy integration into new and existing pipeline systems.
Available in sizes from DN100 to DN1600 and pressure ratings from PN10 to PN25, these joints offer exceptional durability, corrosion resistance, and long-term reliability in harsh environments.
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Key Features
Technical Specifications
| Nominal Diameter (DN) | Length (mm) | Outer Diameter (mm) | Bellows Thickness (mm) | Axial Movement (mm) | Lateral Movement (mm) | Angular Movement (°) | Flange Thickness (mm) | Bolt Qty |
|---|
| DN100 | 600 | 210 | 1.5 | ±25 | ±15 | 3° | 16 | 8 |
| DN200 | 700 | 320 | 2.0 | ±30 | ±20 | 4° | 18 | 12 |
| DN400 | 850 | 540 | 2.5 | ±40 | ±25 | 5° | 20 | 16 |
| DN600 | 1000 | 770 | 3.0 | ±50 | ±30 | 5° | 22 | 20 |
| DN800 | 1200 | 990 | 3.5 | ±60 | ±35 | 6° | 25 |
| Parameter | Unit | Value |
|---|
| Working Pressure | MPa | 0.1 ~ 2.5 |
| Burst Pressure | MPa | ≥1.5×Working Pressure |
| Temperature Range | °C | -30 ~ 450°C |
| Thrust Absorption | – | Integrated (no external anchors needed) |
| Medium Compatibility | – | Hot air, steam, exhaust gas, liquids |
| Bellows Material | – | Stainless Steel (304/316L/321) |
| Component | Material Options |
|---|
| Bellows | Stainless Steel (304, 316L, 321) |
| Internal Sleeve | Stainless Steel, Carbon Steel (optional) |
| Outer Shell/Guide | Carbon Steel (painted or galvanized), Stainless Steel |
| Tie Rods | Carbon Steel (galvanized), Stainless Steel |
| Flanges | Carbon Steel, Stainless Steel |
| Bolts & Nuts | Carbon Steel (galvanized), Stainless Steel |
Check bellows for damages and alignment before installation.
Mount flanges to piping flanges evenly with gasket material.
Avoid applying excessive torque to bolts to prevent bellows distortion.
Ensure freedom of movement by not restricting joint’s expansion capabilities.
No additional anchors required due to thrust-free design.
Inspect periodically (every 6-12 months) for leakage or damage.
Check alignment and bellows condition regularly.
Ensure bellows are clean and free from obstructions.
Replace the expansion joint immediately if significant wear or deformation is detected.
No regular lubrication required due to maintenance-free bellows design.
What kind of documents are included with the shipment?
We provide a full set of export documents, including packing list, commercial invoice, product test report, and material certificate. Custom clearance documents are also available upon request.
What Sizes, Materials, and Configurations Are Available for Thrust-Free Expansion Joints?
Our Thrust-Free Expansion Joints are designed to eliminate axial thrust in high-pressure pipelines, protecting adjacent equipment such as pumps and valves. Available in sizes from DN100 to DN1200, these joints are built with stainless steel sleeves, oil-lubricated sliding parts, and flanged connections for stable performance. Custom dimensions and coatings are available upon request.
Can you produce customized rubber joints according to our drawing?
Yes. We support OEM and ODM services. Just send us your drawing or specifications, and our technical team will provide a matching solution with fast production.
Why Choose Zhengda Valve & Pipeline Co., Ltd.?
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Let Us Help With Your Pipeline Needs
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