Hongze Valve
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Oil-Filled Thrust-Free Sleeve-Type Expansion Joint
The Oil-Filled Thrust-Free Sleeve-Type Expansion Joint, also known as an oil-lubricated axial expansion joint or thrust-free sleeve compensator, is engineered to absorb axial movement and thermal expansion in large diameter pipelines without transmitting thrust force to the system. Featuring a robust steel sleeve structure and oil-filled sealing design, this expansion joint offers excellent sealing performance, low friction, and long service life, even under high pressure and frequent movement.
Widely used in water supply, heating networks, power plants, and long-distance pipelines, oil-filled thrust-free sleeve-type expansion joints are ideal for preventing pipeline stress, foundation damage, and misalignment issues in critical infrastructure projects.
Key Features
Technical Specifications
| Nominal Diameter (DN) | Length (mm) | Outer Diameter (mm) | Sleeve Thickness (mm) | Max Axial Movement (mm) | Lubricant Port Diameter (mm) | Flange Thickness (mm) | Bolt Quantity |
|---|---|---|---|---|---|---|---|
| DN100 | 300 | 180 | 5 | ±25 | 10 | 14 | 8 |
| DN200 | 350 | 295 | 6 | ±40 | 15 | 16 | 12 |
| DN300 | 400 | 410 | 8 | ±50 | 15 | 18 | 12 |
| DN400 | 450 | 525 | 10 | ±65 | 20 | 20 | 16 |
| DN600 | 550 | 770 | 12 | ±80 | 25 | 24 | 20 |
| Parameter | Unit | Value |
|---|---|---|
| Working Pressure | MPa | 0.6 ~ 2.5 |
| Burst Pressure | MPa | ≥1.5×Working Pressure |
| Temperature Range | °C | -20 ~ 200°C |
| Lubrication Requirement | Lubrication Frequency | Grease every 3~6 months |
| Medium Compatibility | – | Water, Oil, Gas, Steam, Air |
| Friction Coefficient | – | ≤0.05 (With proper lubrication) |
| Component | Material Options |
|---|
| Sleeve | Carbon Steel (with hard chrome plating), Stainless Steel |
| Body/Casing | Carbon Steel, Stainless Steel |
| Flange | Carbon Steel, Stainless Steel |
| O-Ring Seal | EPDM, NBR, Viton (Optional) |
| Bolts & Nuts | Carbon Steel (galvanized), Stainless Steel |
Verify alignment and concentricity with piping before installation.
Apply suitable grease thoroughly via lubrication ports before commissioning.
Ensure uniform tightening of flange bolts in a crisscross pattern.
Periodically lubricate the joint to maintain smooth axial movement.
Check and replenish lubricant every 3-6 months.
Regularly inspect seals and surfaces for signs of wear or leakage.
Replace worn seals promptly to avoid operational downtime.
Ensure proper alignment is maintained to minimize sleeve abrasion.
What are the main functions of an oil-filled thrust-free sleeve-type expansion joint?
This joint absorbs axial movement and thermal expansion in pipelines while eliminating thrust force transfer, reducing stress on anchors and foundations. Its oil-lubricated design minimizes friction and enhances sealing performance.
Where are oil-filled sleeve-type expansion joints commonly used?
They are widely used in water supply systems, heating pipelines, power stations, municipal water projects, and long-distance or large-diameter pipeline networks where reliable axial movement absorption is essential.
What are the advantages of the oil-filled design?
The oil-filled structure provides excellent lubrication, reduces wear and friction between moving parts, improves sealing, and ensures long-term, maintenance-free operation under high pressure and frequent movement.
Can oil-filled thrust-free expansion joints be customized for different project requirements?
Yes, we offer OEM and ODM customization. Sizes, materials, pressure ratings, and flange standards can be tailored to meet your specific project needs—just provide your drawings or technical requirements.
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