1. Structure and Materials

• Main Components:
  • Inner Layer: Nitrile Butadiene Rubber (NBR) or Ethylene Propylene Diene Monomer (EPDM), selected based on medium characteristics (NBR for oil resistance; EPDM for acid/alkali and high-temperature resistance).
  • Reinforcement Layer: Cross-woven polyester cord fabric, enhancing compressive strength and tear resistance.
  • Outer Layer: Chloroprene Rubber (CR) protective layer, anti-aging and weather-resistant for outdoor applications.
• Connection Method: Standard flanges at both ends, made of Q235 carbon steel or stainless steel (304/316), compliant with GB/T 9119 or ANSI B16.5 standards.

2. Technical Parameters

• Nominal Diameter: DN150 (6 inches), suitable for pipes with outer diameter 159mm.
• Working Pressure:
  • Standard type: 1.0MPa (10kgf/cm²);
  • High-pressure type: 1.6MPa/2.5MPa (customizable).
• Temperature Range:
  • NBR: -20℃~120℃ (for oily media);
  • EPDM: -40℃~150℃ (for water, steam, acid-alkali solutions).
• Displacement Compensation:
  • Axial extension: ≤10mm; axial compression: ≤15mm;
  • Lateral displacement: ≤12mm; angular deflection: ≤15°.
    
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3. Product Features

• Vibration and Noise Reduction: Rubber elastomer absorbs pipeline vibrations (e.g., mechanical vibrations from pumps/fans), reducing noise by 15-30dB.
• Displacement Compensation: Adapts to thermal expansion, installation errors, or foundation settlement, preventing pipeline stress concentration and rupture.
• Reliable Sealing: Inward flanged design at the flange-rubber sphere junction, combined with uniform bolt tightening, prevents medium leakage.
• Medium Resistance: Depending on rubber material, withstands water, hot water, oil, weak acids/alkalis, compressed air, etc. (fluororubber FKM required for strong corrosives).

4. Application Scenarios

• Water Supply and Drainage: Flexible connections for high-rise building pipelines and wastewater treatment plants.
• HVAC Systems: Chilled water/cooling water pipes in central air conditioning, fan coil connections to reduce vibration transmission.
• Industrial Pipelines: Non-strongly corrosive chemical media, compressed air, steam pipes (EPDM+wire reinforced type for steam).
• Fire Protection Systems: Seismic connections for sprinkler and fire hydrant pipes, meeting fire safety codes.

5. Installation Notes

• Do not exceed rated pressure; install limit devices for high-pressure conditions.
• Ensure parallel flanges during installation; tighten bolts symmetrically to prevent local deformation of the rubber sphere.
• Verify medium compatibility (e.g., NBR must be used for oil, not EPDM).
• Thermal expansion allowance for high-temperature media (over 80℃); insulate in cold regions to prevent rubber hardening.
• Annual inspection: Check for loose flange bolts and outer rubber cracking/aging; replace seals promptly.

6. Customization Options

• Material Upgrades:
  • Flanges: Stainless steel 304/316 (for seawater or food-grade media);
  • Rubber: Fluororubber (FKM) for 200℃ high-temperature/strong corrosion; silicone rubber (VMQ) for -60℃ low-temperature resistance.
• Special Structures:
  • Double-sphere design: Increases compensation (axial displacement up to 25mm) with slightly reduced pressure resistance;

7. Comparison with Double-Sphere Rubber Joints

Compliance Standards

• China: GB/T 26121-2010 Rubber Joints;
• International: ISO 13941-2013 Rubber expansion joints for pipe systems.