Zhengda Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Sleeve-Type Expansion Joint with Oil Seal
Oil-Lubricated Sleeve Expansion Joint is a specially engineered pipe compensator designed to absorb axial movement and vibration in large-diameter pipeline systems. It features a telescopic sleeve structure with a sealed oil lubrication layer between the inner and outer sleeves, reducing friction, preventing metal wear, and ensuring smooth extension and contraction. This product is widely used in urban water supply, sewage treatment, thermal power, metallurgy, and chemical industries where long-term sealing and movement absorption are required under high pressure or large pipe diameter conditions.
Constructed with carbon steel or stainless steel and equipped with oil injection nozzles, the lubricated sleeve expansion joint offers extended service life and excellent sealing performance. It is particularly effective in applications where frequent thermal expansion and contraction occur.
Keywords: oil-lubricated expansion joint, sliding sleeve compensator, axial movement compensator, large diameter pipe joint, pipe vibration absorber, friction-reducing sleeve joint.
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 documents are provided 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.
Can you customize oil-lubricated expansion joints based on our drawings?
Yes, we support OEM & ODM services. You can send us your drawings, specifications, or application requirements. Our engineering team will design a suitable expansion joint accordingly.
What sizes and pressure levels are available?
Standard sizes range from DN200 to DN2000, with working pressures from PN1.0 MPa to PN2.5 MPa. Larger sizes and higher pressures can be customized as needed.
Why Choose Zhengda for Oil-Lubricated Expansion Joints?
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