Hongze Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Double Sphere Rubber Expansion Joint
Double Sphere Rubber Expansion Joints, also known as double arch rubber bellows or twin-sphere flexible connectors, are specially engineered to provide superior flexibility, vibration absorption, and noise reduction in piping systems. Featuring a double-sphere (double arch) design, these flexible rubber joints allow for greater movement and improved stress distribution compared to single sphere types.
Manufactured from high-quality EPDM, NBR, or other custom rubber compounds and reinforced with steel flanges, double sphere expansion joints are ideal for water supply, HVAC systems, industrial pipelines, and wastewater treatment. These rubber expansion joints accommodate axial, lateral, and angular movement, effectively protecting piping from thermal expansion, vibration, and misalignment.
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 | 1.25” | 95 | 16 | 4 | 18 | 100 | 6 | 9 | 9 |
| DN40 | 1.5” | 95 | 18 | 4 | 18 | 110 | 6 | 10 | 9 |
| DN50 | 2” | 105 | 18 | 4 | 18 | 125 | 7 | 10 | 10 |
| DN65 | 2.5” | 115 | 20 | 4 | 18 | 145 | 7 | 13 | 11 |
| DN80 | 3” | 135 | 20 | 4 | 18 | 160 | 8 | 15 | 12 |
| DN100 | 4” | 150 | 22 | 8 | 18 | 180 | 10 | 19 | 13 |
| DN125 | 5” | 165 | 24 | 8 | 18 | 210 | 12 | 19 | 13 |
| DN150 | 6” | 180 | 24 | 8 | 23 | 240 | 12 | 20 | 14 |
| DN200 | 8” | 210 | 24 | 8 | 23 | 295 | 16 | 25 | 22 |
| DN250 | 10” | 230 | 26 | 12 | 23 | 350 | 16 | 25 | 22 |
| DN300 | 12” | 245 | 28 | 12 | 23 | 400 | 16 | 25 | 22 |
| DN350 | 14” | 255 | 28 | 16 | 23 | 460 | 16 | 25 | 22 |
| DN400 | 16” | 255 | 30 | 16 | 25 | 515 | 16 | 25 | 22 |
| DN450 | 18” | 255 | 30 | 20 | 25 | 565 | 16 | 25 | 22 |
| DN500 | 20” | 255 | 32 | 20 | 25 | 620 | 16 | 25 | 22 |
| DN600 | 24” | 260 | 36 | 20 | 30 | 725 | 16 | 25 | 22 |
| DN700 | 28” | 260 | 36 | 24 | 30 | 840 | 16 | 25 | 22 |
| DN800 | 32” | 260 | 38 | 24 | 34 | 950 | 16 | 25 | 22 |
| DN900 | 36” | 260 | 42 | 28 | 34 | 1050 | 16 | 25 | 22 |
| DN1000 | 40” | 260 | 44 | 28 | 34 | 1160 | 18 | 26 | 24 |
| DN1200 | 48” | 260 | 48 | 32 | 41 | 1380 | 18 | 26 | 24 |
| DN1400 | 56” | 350 | 44 | 36 | 34 | 1560 | 20 | 28 | 26 |
| DN1600 | 64” | 350 | 46 | 40 | 34 | 1760 | 25 | 35 | 30 |
| DN1800 | 72” | 350 | 52 | 44 | 41 | 1970 | 25 | 35 | 30 |
| DN2000 | 80” | 420 | 54 | 48 | 48 | 2180 | 25 | 35 | 30 |
| DN2200 | 88” | 580 | 40 | 52 | 48 | 2390 | 25 | 35 | 30 |
| DN2400 | 96” | 610 | 41 | 56 | 48 | 2600 | 25 | 35 | 30 |
| DN2600 | 104” | 650 | 42 | 60 | 54 | 2810 | 25 | 35 | 30 |
| DN2800 | 112” | 680 | 45 | 64 | 54 | 3020 | 25 | 35 | 30 |
| DN3000 | 120” | 680 | 50 | 68 | 54 | 3220 | 25 | 35 | 30 |
Notes
Customization available upon request with specific drawings or specifications; flanges are based on the “National General Water Supply and Drainage Standard Atlas,” others follow HG/T2289-92.
For DN350-600(2) models, working pressure is 1.6MPa; for DN32-400(3) models, working pressure is 2.5MPa.
For DN700-DN200 models, working pressure is 1.0MPa; for DN1400, working pressure is 0.6MPa; for DN1600-DN1800, working pressure is 0.4MPa, flanges are selected according to 0.6MPa; for DN2000, working pressure is 0.25MPa, flanges are selected according to 0.6MPa pressure.
For high-rise water supply, products above DN200 must have fixed supports or brackets; otherwise, anti-pullout devices should be installed.
| Project | Unit | JGD-1 | JGD-2 | JGD-3 |
|---|---|---|---|---|
| Model | – | JGD-1 | JGD-2 | JGD-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) | – | – |
| Applicable Media | – | 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 are the advantages of using double sphere rubber expansion joints over single sphere types?
Double sphere rubber expansion joints offer greater flexibility, better vibration absorption, and improved noise reduction compared to single sphere designs. Their twin-arch construction allows for more movement and better stress distribution, protecting pipelines in demanding applications.
What applications are double sphere rubber expansion joints suitable for?
These expansion joints are widely used in water supply and drainage systems, HVAC pipelines, wastewater treatment, power plants, and other industrial piping where high flexibility and vibration isolation are required.
What materials are available for double sphere rubber expansion joints?
We offer double sphere expansion joints in EPDM, NBR, Neoprene, and other custom rubber materials, with carbon steel or stainless steel flanges to meet different media and environmental conditions.
Can double sphere rubber expansion joints be customized?
Yes, we provide OEM and ODM services. You can request custom sizes, materials, and flange standards to fit your specific pipeline requirements. Simply send us your drawings or specifications for a tailored solution.
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