Zhengda Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Clamp-Type Rubber Expansion Joint
Clamp Type Rubber Joints, also known as hose-end flexible connectors or clamp-on rubber expansion joints, are designed for fast and secure installation without flanges. These joints feature smooth rubber ends that are clamped directly onto pipe outlets using stainless steel or galvanized clamps, making them ideal for applications where flanged connections are not feasible.
Widely used in low-pressure piping systems, such as cooling towers, drainage systems, pump inlets/outlets, and water treatment lines, clamp-type rubber joints provide excellent vibration isolation, noise reduction, and flexibility for piping adjustments.
Key Features
Technical Specifications
| Nominal Diameter (DN) | Inch | Length (L) mm | Clamp Thickness (mm) | Axial Extension (mm) | Lateral Displacement (mm) | Angular Deflection (°) |
|---|
| DN32 | 1.25″ | 95 | 16 | 6 | 9 | 9 |
| DN40 | 1.5″ | 95 | 18 | 6 | 10 | 9 |
| DN50 | 2″ | 105 | 18 | 7 | 10 | 10 |
| DN65 | 2.5″ | 115 | 20 | 7 | 13 | 11 |
| DN80 | 3″ | 135 | 20 | 8 | 15 | 12 |
| DN100 | 4″ | 150 | 22 | 10 | 19 | 13 |
| DN125 | 5″ | 165 | 24 | 12 | 19 | 13 |
| DN150 | 6″ | 180 | 24 | 12 | 20 | 14 |
| DN200 | 8″ | 210 | 24 | 16 | 22 | 14 |
| DN250 | 10″ | 230 | 26 | 16 | 25 | 14 |
| DN300 | 12″ | 245 | 28 | 16 | 25 | 14 |
| DN350 | 14″ | 255 | 28 | 16 | 25 | 14 |
| Project | Unit | Clamp-1 | Clamp-2 | Clamp-3 |
|---|
| Model | – | Clamp-1 | Clamp-2 | Clamp-3 |
| Working Pressure | MPa (kgf/cm²) | 1.0 (10) | 1.6 (16) | 2.5 (25) |
| Burst Pressure | MPa (kgf/cm²) | 2.0 (20) | 3.0 (30) | 4.5 (45) |
| Vacuum Resistance | KPa (mmHg) | 53.3 (400) | 86.7 (650) | 100 (750) |
| Operating Temperature | °C | -15 ~ 115°C (Special: -30 ~ 250°C) | -15 ~ 115°C (Special: -30 ~ 250°C) | -15 ~ 115°C (Special: -30 ~ 250°C) |
| Applicable Media | – | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. |
| Material | Temperature Range (°C) | Oil Resistance | Acid & Alkali Resistance | Elasticity | Abrasion Resistance | Typical Applications |
|---|
| EPDM | -40 ~ 120 | Poor | Excellent | Excellent | Medium | Water, Steam, Air |
| NR (Natural Rubber) | -30 ~ 80 | Poor | Medium | Excellent | Excellent | Industrial Water, Air |
| NBR | -20 ~ 100 | Excellent | Medium | Good | Good | Oil, Lubrication Systems |
| Neoprene | -35 ~ 100 | Good | Good | Medium | Good | Seawater, Mild Chemicals |
| Silicone | -60 ~ 200 | Poor | Poor | Good | Low | Food Grade, Medical |
| FKM (Viton) | -20 ~ 250 | Excellent | Excellent | Medium | Excellent | Chemical, High Temp Oil |
| Butyl (IIR) | -40 ~ 120 | Poor | Good | Excellent | Medium | Gas, Acidic Gases |
Preparation:
Inspect the clamp rubber joints and pipeline ends to ensure surfaces are clean, smooth, and free of dirt or damage.Alignment:
Align the joint accurately between pipe ends, ensuring proper distance according to specified lengths in the technical datasheet.Installation:
Position the clamp evenly around the rubber joint. Tighten clamps gradually and symmetrically to ensure even pressure distribution and effective sealing.Bolt Tightening:
Do not overtighten the clamps. Follow the recommended torque values specified by the clamp manufacturer to prevent deformation or damage to the rubber joint.Inspection and Testing:
After installation, visually inspect to confirm proper fit and alignment. Conduct a pressure test to ensure no leakage.
Regular Inspection:
Periodically inspect the joint for signs of wear, cracking, distortion, or corrosion of clamps.Tightness Check:
Ensure clamps remain properly tightened according to recommended torque settings. Re-tighten clamps if necessary, but avoid excessive force.Replacement:
Replace immediately if signs of severe deterioration or leaks appear, or if the joint has reached the end of its recommended service life.Environmental Factors:
Ensure rubber joints are shielded from prolonged exposure to extreme heat, UV rays, chemicals, or sharp objects to maximize service life.Cleaning:
Regularly clean the rubber surface and clamps with mild detergent and water to avoid chemical build-up, preventing premature aging and corrosion.
What kind of documents are included with the shipment?
We provide a full set of export documents for clamp type rubber joints, including packing list, commercial invoice, material test report, and certificate of origin. Customized documentation is also available upon request.
What sizes and materials are available for clamp type rubber joints?
Clamp rubber joints are typically available from DN25 to DN300. Material options include EPDM, NBR, Neoprene, and food-grade silicone. We also offer stainless steel or galvanized clamps based on application needs.
Can you produce customized clamp joints according to our drawing?
Yes. We offer full OEM/ODM support. Just send us your specification or dimensional drawing, and our technical team will recommend a suitable clamp-on rubber joint with quick production turnaround.
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