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The 90° rubber expansion joint, also known as a right-angle rubber expansion joint or vibration-damping expansion joint, is an L-shaped 90° flexible rubber connector. It is formed by high-temperature vulcanization of a rubber bend and metal flanges at both ends. It replaces the steel 90° expansion joint and combines the three functions of pipeline turning, vibration reduction, and displacement compensation.
1. Inner Rubber Layer: closely contacts the medium, dense and impermeable;
2. Reinforcement Layer: multi-layer nylon fabric and steel wire pressure ring, pressure-resistant and tensile-resistant;
3. Outer Rubber Layer: aging-resistant, ozone-resistant, protective fabric;
End fittings: carbon steel/stainless steel loose flanges.
Vibration and Noise Reduction: standard for pump and fan inlets and outlets, blocks vibration transmission along the pipeline, reduces pipeline noise;
Tolerant Installation: compensates for pipe misalignment and flange unevenness, reducing construction difficulty;
Corrosion Resistance: rubber can be selected according to the medium, resistant to acid, alkali, sewage, and oil, superior to ordinary cast iron elbows;
Smaller Footprint: short-radius structure saves 40% installation space compared to steel elbows;
Easy Disassembly and Assembly: flange bolts are tightened diagonally, allowing quick maintenance and replacement later.
1. Water Supply and Drainage: building tap water, sewage pipelines, pump room 90° turns;
2. HVAC: central air conditioning hot and cold water pipelines, cooling tower pipelines;
3. Industrial and Chemical: chemical plant acid, alkali liquid, and oil transfer pipelines;
4. Firefighting, power plants, ships, municipal pump rooms, and flexible angular connections at fan inlets and outlets.
1. Suspended installation of DN200 and above must be equipped with fixed brackets, optional anti-pull rods to prevent the pressure from pulling the elbow;
2. Bolts should be tightened evenly diagonally, do not forcibly tighten on one side;
3. For high-temperature and high-pressure conditions, use corresponding special rubber materials, do not mix with ordinary rubber elbows.
| Connector Specifications: [DN50mm-DN300mm] Applications: [Acids, alkalis, corrosive substances, oils, hot water, cold water, compressed air, natural gas, etc.] Quality Certification: International ISO9001-2008 Connector Material: Environmentally friendly high-quality synthetic rubber; the product is environmentally friendly and pollution-free, containing no lead or other toxic substances. Vibration Damping Rating: Class A, excellent vibration damping performance Operating Temperature: -40°C to 80°C (High-temperature resistant connectors can also be customized). |
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| serial number | parts | quantity | Material | |
| 1 | main body | 1 | Natural rubber (NR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), fluororubber (FKM), ethylene propylene diene monomer (EPDM) rubber | |
| 2 | Inner and outer linings | 1 set | Natural rubber (NR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), fluororubber (FKM), ethylene propylene diene monomer (EPDM), polytetrafluoroethylene (PTFE) | |
| 3 | Main skeleton | 1 set | Nylon curtain | |
| 4 | booster ring | 1 | Multi-strand copper-plated steel wire | |
| 5 | flange | 2 | Q235 stainless steel | |
| Item\Model | KWT-1 | KWT-2 | KWT-1 | |
| Working pressure MPa | 1.0(10) | 1.6(16) | 2.5(25) | |
| Explosion pressure (MPa) | 2.0(20) | 3.0(30) | 4.0(45) | |
| Vacuum degree Kpa | 53.3(400) | 86.7(650) | 100(750) | |
| Applicable temperature℃ | -15℃ to +115℃; special models can reach -30℃ to +250℃. | |||
| Applicable media | Air, compressed air, water, seawater, hot water, oil, acids and alkalis | |||
| Nominal diameter DN | length L |
Allowable displacements (mm) | ||||||
| mm | inch | X | X' | Y | Y' | Z | Z' | |
| 50 | 2 | 140 | 20 | 16 | 20 | 16 | 16 | 16 |
| 65 | 2.5 | 140 | 20 | 16 | 20 | 16 | 16 | 16 |
| 80 | 3 | 150 | 20 | 16 | 20 | 16 | 16 | 16 |
| 100 | 4 | 160 | 20 | 16 | 20 | 16 | 16 | 16 |
| 125 | 5 | 180 | 20 | 16 | 20 | 16 | 16 | 16 |
| 150 | 6 | 230 | 20 | 16 | 20 | 16 | 16 | 16 |
| 200 | 8 | 265 | 20 | 16 | 20 | 16 | 16 | 16 |
| 250 | 10 | 280 | 20 | 16 | 20 | 16 | 16 | 16 |
| 300 | 21 | 330 | 20 | 16 | 20 | 16 | 16 | 16 |
