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A flexible coupling is a mechanical pipe fitting designed to connect pipes through a specialized grooved mechanism paired with a seal ring. Its primary function is to accommodate pipe movement (axial, angular, or parallel) and dampen vibrations, thereby reducing the risk of system failure. This fitting simplifies pipe installation and removal while maintaining consistent sealing performance to ensure the integrity of fluid or gas transport systems.
Widely utilized across industries, flexible couplings are suitable for fire protection, water supply, HVAC, and petrochemical systems—particularly in setups requiring flexibility, seismic resistance, and leak-proof connections.
Material: Constructed from ductile iron grades including ASTM A536, GRADE 65-45-12, and QT450-10, ensuring durability under varying pressure and temperature conditions.
Threads: Compatible with international standards such as ASME B1.20.1, ISO 7-1, BS21, BSPT, NPT, and GB 7306, facilitating compatibility with global pipe systems.
Size Range: Available in 1"-24" (nominal size), adhering to ISO6182 and AWWA C606 standards.
Detailed Dimensions: Specific parameters (pipe O.D., working pressure, bolt size, and structural dimensions) are outlined in the table below:
Nominal Size (mm/in) | Pipe O.D (mm/in) | Working Pressure (PSI/MPa) | Bolt Size | Dimensions (L mm/in) | UL/FM Certified |
25/1" | 33.7/1.327" | 500/3.45 | 2-M10x45 | 57.5/2.264" | Yes |
50/2" | 60.3/2.375" | 500/3.45 | 2-M10x55 | 87/3.425" | Yes |
100/4" | 108.0/4.250" | 500/3.45 | 2-M12x65 | 137/5.393" | Yes |
200/8" | 219.1/8.625" | 300/2.07 | 2-M14x100 | 253/9.961" | Yes |
To enhance corrosion resistance, flexible couplings undergo one of the following treatments:
Electrophoretic painting
Electroplating
Epoxy coating
Hot-dip galvanizing
The product meets strict pressure retention standards, as detailed below:
No. | Size Range | Pressure | Retention Time | Test Medium |
1 | ≤DN50 | ≥0.5MPa | ≥5s | Air |
2 | >DN50~DN350 | ≥0.5MPa | ≥10s | Air |
3 | >DN350 | 1.5×rated pressure | 5min | Water |
Sealing performance is ensured by specialized rubber gaskets, with options tailored to different media and temperatures:
Gasket Type | Recommended Medium | Temperature Range | Related Standards |
EPDM | Water supply, drainage, air | -30℃~+130℃ | GB5135.11, GB/T 21873 |
NITRILE | Petroleum, mineral oil | -20℃~+80℃ | GB5135.11, GB/T 23658 |
FLUORINE | Acid/alkaline solutions | -20℃~+180℃ | HG/T 2181 |
Misalignment Compensation: Accommodates angular, parallel, and axial misalignments between connected pipes, reducing stress on system components.
Vibration Dampening: Absorbs vibrations generated by machinery, extending the service life of connected equipment.
Shock Load Resistance: Mitigates sudden pressure spikes or mechanical shocks, protecting pipes from damage.
Material Versatility: Available in rubber, polyurethane, or metallic alloys to suit specific environmental conditions.
Ease of Maintenance: Designed for straightforward installation and removal, with no lubrication required in most cases.
Flexible couplings are integrated into diverse industrial systems, including:
Fire protection systems (for seismic and pressure stability).
Water supply and drainage networks (accommodating ground movement).
HVAC systems (managing thermal expansion of pipes).
Petrochemical facilities (sealing hazardous fluids).
Commonly paired with pumps, compressors, conveyors, and general machinery where shaft or pipe misalignment is likely due to thermal expansion or manufacturing tolerances.
Remove the flexible coupling from packaging and inspect for damage.
Split the coupling housing to prepare for pipe placement.
Ensure pipe ends are properly grooved and cleaned.
Lubricate the rubber gasket to facilitate installation.
Position the gasket around the pipe ends.
Assemble the coupling housing and secure with bolts.
Tighten bolts uniformly to specified torque.
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