Zhengda Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
PTFE-Lined Rubber Expansion Joint
The PTFE Lined Rubber Expansion Joint, also called PTFE Coated Rubber Joint or Fluoroplastic Lined Flexible Connector, is specially designed to handle highly corrosive media such as strong acids, alkalis, and solvents. It combines the flexibility of rubber with the chemical resistance of PTFE (Teflon), making it ideal for chemical processing, pharmaceutical, and wastewater treatment 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 | 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 kind of documents are included 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.
What sizes and materials are available for rubber expansion joints?
Our rubber joints are available in sizes from DN32 to DN1200, and materials include EPDM, NBR, Neoprene, PTFE-lined rubber, and food-grade silicone. Custom materials are available for specific industries.
Can you produce customized rubber joints according to our drawing?
Yes. We support OEM and ODM services. Just send us your drawing or specifications, and our technical team will provide a matching solution with fast production.
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We respond quickly to inquiries and provide expert support on rubber joints, metal hoses, and customized solutions.