Hongze Valve
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Eccentric Rubber Reducer Joint
The Eccentric Rubber Reducer Joint, also known as Eccentric Rubber Expansion Joint or Offset Rubber Reducer, is engineered to connect pipelines of different diameters while maintaining a smooth flow direction. Its offset (eccentric) design effectively prevents air pockets and reduces flow turbulence, making it especially suitable for horizontal pipelines, pump inlets, and drainage systems. Manufactured from high-quality EPDM, NBR, or custom rubber compounds and equipped with robust steel flanges, this joint ensures superior vibration absorption, displacement compensation, and alignment correction in various industrial applications.
Key Features
Technical Specifications
| Nominal Diameter (DN) | Inch | Length (L) mm | Flange Thickness (b) mm | Bolt Qty (n) | Bolt Hole Dia. mm | Bolt Circle Dia. (D1) mm | Axial Extension mm | Lateral Displacement mm | Angular Deflection (°) |
|---|
| DN32×25 | 1¼”×1″ | 95 | 16 | 4 | 18 | 100 | 6 | 9 | 9 |
| DN40×32 | 1½”×1¼” | 95 | 18 | 4 | 18 | 110 | 6 | 10 | 9 |
| DN50×40 | 2″×1½” | 105 | 18 | 4 | 18 | 125 | 7 | 10 | 10 |
| DN65×50 | 2½”×2″ | 115 | 20 | 4 | 18 | 145 | 7 | 13 | 11 |
| DN80×65 | 3″×2½” | 135 | 20 | 4 | 18 | 160 | 8 | 15 | 12 |
| DN100×80 | 4″×3″ | 150 | 22 | 8 | 18 | 180 | 10 | 19 | 13 |
| DN125×100 | 5″×4″ | 165 | 24 | 8 | 18 | 210 | 12 | 19 | 13 |
| DN150×125 | 6″×5″ | 180 | 24 | 8 | 23 | 240 | 12 | 20 | 14 |
| DN200×150 | 8″×6″ | 210 | 24 | 8 | 23 | 295 | 16 | 22 | 14 |
| DN250×200 | 10″×8″ | 230 | 26 | 12 | 23 | 350 | 16 | 25 | 14 |
| DN300×250 | 12″×10″ | 245 | 28 | 12 | 23 | 400 | 16 | 25 | 14 |
| DN350×300 | 14″×12″ | 255 | 30 | 16 | 23 | 460 | 16 | 25 | 22 |
| DN400×350 | 16″×14″ | 255 | 30 | 16 | 25 | 515 | 16 | 25 | 22 |
| DN450×400 | 18″×16″ | 255 | 30 | 20 | 25 | 565 | 16 |
| Project | Unit | ERJ-1 | ERJ-2 | ERJ-3 |
|---|
| Model | – | ERJ-1 | ERJ-2 | ERJ-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 |
What is the main advantage of using an Eccentric Rubber Reducer Joint?
The main advantage is its offset design, which prevents air accumulation and flow turbulence in pipelines. This ensures a stable and smooth flow, particularly in horizontal pipelines or pump inlet applications.
Where are Eccentric Rubber Reducer Joints commonly used?
They are widely used in water treatment plants, industrial pipelines, HVAC systems, drainage systems, and pump stations—anywhere a pipeline size change is needed without disrupting the flow direction.
What materials and sizes are available for Eccentric Rubber Reducer Joints?
Our eccentric reducer joints are available in various sizes to fit different pipeline diameters. Materials include EPDM, NBR, or custom rubber compounds, with carbon steel or stainless steel flanges to meet diverse application needs.
Can Eccentric Rubber Reducer Joints be customized for specific projects?
Yes, we offer OEM and ODM services. Custom sizes, rubber materials, and flange standards are available. Simply provide your requirements or drawings, and our engineering team will deliver a tailored solution.
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