Rubber Joints
Single & / Double Sphere | DN32 - DN1200 | PN16 / ANSI 150
ZNX rubber joints (also called rubber expansion joints or flexible connectors) consist of an EPDM/NBR rubber body reinforced with nylon tire cord, fitted with galvanized ductile iron or carbon steel rotating flanges. They absorb axial, lateral and angular movement, dramatically reduce vibration transmission from pumps and equipment, and silence hydraulic shock in long pipelines.
Used at pump suction and discharge, between building risers, around chillers, boilers and any equipment that needs to be isolated from the piping system. Each joint is 100% hydrostatically tested and labelled.
Technical Specifications
| Size Range | DN32 - DN1200 (1¼" - 48") |
| Pressure Rating | PN10, PN16, ANSI 150 (higher ratings on request) |
| Body Material | EPDM rubber body, NBR or Neoprene on request |
| Reinforcement | Nylon tire cord + steel wire |
| Flange Material | Galvanized Ductile Iron / Carbon Steel, also SS304/SS316 |
| Flange Standard | ANSI 150, DIN PN10/16, JIS 10K, BS, AS2129 |
| Working Temp. | -20°C to +110°C (EPDM), -10°C to +90°C (NBR) |
| Working Pressure | 16 bar standard, 25 bar on request |
| Burst Pressure | ≥ 60 bar |
| Axial Compression | Up to 25 mm |
| Axial Elongation | Up to 14 mm |
| Lateral Movement | Up to 22 mm |
| Angular Deflection | Up to 15° |
| Vacuum Rating | Up to -750 mmHg |
| Standard | ISO 9001, EN 12266, ANSI B16.5 / B16.47 |
Key Features
- Single and double sphere models cover all movement directions
- EPDM body resists hot water, steam, weak acids, seawater
- Galvanized ductile iron flanges for corrosion resistance
- Anti-blowout reinforced body, safe up to full vacuum
- Dramatically reduces pump vibration transmitted to piping
- 100% hydrostatically tested before shipment
- Self-flanged integral mould — no glued joints, no leakage
Applications
- Pump suction and discharge (vibration isolation)
- Building HVAC risers (thermal expansion)
- Chilled water and condenser lines
- Seawater and desalination intake lines
- Boiler feed and condensate lines
- Compressor and chiller connections
- Long straight runs requiring movement compensation