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The Flexible Coupling is a dynamic pipe fitting designed to facilitate secure flexible pipe connections while addressing common challenges such as vibration, misalignment, and thermal expansion. Unlike rigid couplings, it incorporates a grooved mechanism paired with a high-performance seal ring, allowing it to absorb axial, angular, and parallel pipe movements. This flexibility not only reduces the risk of pipe failure but also simplifies installation and maintenance, making it a preferred choice for systems that demand adaptability. Whether used in fire protection, HVAC, or petrochemical applications, the Flexible Coupling delivers consistent sealing performance and structural resilience, ensuring the integrity of fluid and gas transport systems.
A standout feature of the Flexible Coupling is its ability to absorb vibrations generated by pumps, compressors, and other machinery. By dampening these vibrations, it minimizes stress on pipes and connected components, extending their service life and reducing maintenance costs.
The coupling accommodates angular, parallel, and axial misalignments between pipes, a common issue caused by thermal expansion, ground movement, or manufacturing tolerances. This compensation prevents pipe warping and leakage, ensuring system efficiency even in less-than-perfect installations.
Equipped with specialized rubber gaskets engineered for different media and temperatures, the Flexible Coupling delivers airtight sealing. The grooved mechanism and seal ring work together to prevent leaks, even under high pressure and fluctuating operating conditions.
Designed for user convenience, the coupling features a split housing that simplifies pipe installation and removal. No lubrication is required in most cases, and its bolt-on design allows for quick repairs or replacements, minimizing system downtime.
Constructed from durable ductile iron and available with corrosion-resistant surface treatments, the Flexible Coupling adapts to diverse environments. It can be used with rubber, polyurethane, or metallic gaskets, making it suitable for everything from potable water systems to harsh petrochemical facilities.
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 |
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 |
In fire protection systems, the Flexible Coupling offers critical seismic resistance. It absorbs ground movement during earthquakes, maintaining pipe integrity and ensuring sprinkler systems remain operational. Its leak-proof design is essential for preserving water pressure during emergencies.
HVAC systems experience constant thermal expansion and contraction. The Flexible Coupling accommodates these movements, reducing stress on heating and cooling pipelines. It also dampens vibrations from air handlers, ensuring quiet and efficient operation.
Petrochemical facilities require couplings that can handle hazardous fluids and harsh conditions. The Flexible Coupling’s corrosion-resistant surface and chemical-compatible gaskets make it ideal for sealing oils, chemicals, and gases, preventing leaks that could lead to safety hazards.
Municipal and commercial water supply networks benefit from the coupling’s ability to absorb ground movement and misalignment. It ensures consistent water flow, even in aging infrastructure, and its easy installation makes it a cost-effective solution for retrofits and new projects.
The Flexible Coupling is built from high-quality ductile iron grades like ASTM A536 and QT450-10, offering exceptional strength and durability. The material’s toughness allows it to withstand pressure spikes and mechanical shocks without deformation.
Threads comply with global standards including ASME B1.20.1, ISO 7-1, and BS21, ensuring compatibility with pipes and fittings from different manufacturers and regions. This universal design simplifies sourcing and installation for global projects.
To enhance corrosion resistance, the coupling undergoes surface treatments such as electrophoretic painting, electroplating, epoxy coating, or hot-dip galvanizing. These treatments protect against rust, chemicals, and environmental damage, extending the coupling’s service life.
Sealing performance is optimized with a range of gasket options: EPDM for water and air, NITRILE for oils, and FLUORINE for acids and alkalis. Each gasket is designed to withstand specific temperature ranges and media types, ensuring a reliable seal in any application.
Its grooved mechanism and flexible seal ring act as a buffer, absorbing mechanical vibrations from machinery. The coupling’s design allows for slight movement, dissipating vibration energy rather than transferring it to the pipes, which reduces wear and tear.
Yes, the Flexible Coupling is an excellent choice for seismic zones. Its ability to accommodate angular and axial movement allows it to withstand ground shifts during earthquakes, preventing pipe breaks and ensuring critical systems like fire protection remain functional.
Absolutely. The coupling is compatible with most common pipe materials, including steel, ductile iron, and PVC. Its universal design and adjustable clamping mechanism ensure a secure fit regardless of the pipe material, making it versatile across applications.
The Flexible Coupling requires minimal maintenance. Routine inspections to check for gasket wear or bolt tightness are recommended, but no regular lubrication or complex servicing is needed. Gaskets can be easily replaced if worn, ensuring the coupling continues to perform effectively.
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