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Overview
The Reducing Flexible Coupling is a specialized pipe fitting that combines the benefits of reducing pipe connections and flexible performance, enabling seamless joining of pipes with varying diameters. Unlike traditional setups that require concentric reducers and extra joints, this coupling integrates both functions into a single, compact component. It is engineered to maintain flexibility, absorb vibrations, and prevent leaks while facilitating smooth diameter transitions—critical for systems where space, efficiency, and reliability are paramount. Constructed from high-strength ductile iron and fitted with precision gaskets, the Reducing Flexible Coupling is a versatile solution for fire protection, HVAC, and industrial piping networks, streamlining system design and reducing potential failure points.
Product Description
Key Parameters
Threads: Compliant with international standards, including ASME B1.20.1, ISO 7-1, BS21, BSPT, NPT, and GB 7306.
Size Standards: Adheres to ISO6182 and AWWA C606.
Available Sizes: 1"-24", covering a broad range of piping requirements.
NO. | Size Range | Test Pressure | Pressure Retention Time | Test Medium |
1 | ≤DN50 | ≥0.5MPa | ≥5s | Air |
2 | ＞DN50~DN350 | ≥0.5MPa | ≥10s | Air |
3 | ＞DN350 | 1.5× rated working pressure | 5min | Water |
Gasket Type | Recommended Application Medium | Related Standards | Temperature Range |
EPDM | Water supply, drainage, sewage, ambient air, weak acids/alkalis | GB5135.11, GB/T 21873 | -30℃~+130℃ (-22°F~+266°F) |
NBR | Petroleum, vegetable oil, mineral oil | GB5135.11, GB/T 23658 | -20℃~+80℃ (-4°F~+176°F) |
SIUCON | Drinking water, high-temperature dry air, certain high-temperature chemicals | GB/T 28604, GB5135.11 | -40℃~+180℃ (-40°F~+356°F) |
Fluorine | Acid/alkaline solutions, hot lubricating oil | HG/T 2181 | -20℃~+180℃ (-4°F~+356°F) |
Neoprene | Seawater | - | -20℃~+100℃ (-4°F~+212°F) |
Main production process
Installation Instructions
FAQ
A Reducing Flexible Coupling is a specialized pipe fitting that combines pipe diameter reduction and flexible connection in a single unit, allowing seamless joining of pipes with different sizes.
Unlike traditional setups that require concentric reducers plus additional flexible couplings, this product integrates both functions, reducing components, installation time, and potential leak points.
It is widely used in fire protection systems, HVAC piping, and industrial pipelines, especially in systems where space, vibration absorption, and reliability are important.
Yes. The coupling is designed to absorb vibrations, allow slight movement, and maintain a leak-proof seal, thanks to high-precision gaskets and ductile iron construction.
Material: High-strength ductile iron
Gaskets: EPDM, Nitrile, or Silicone
Sizes: Vary depending on system requirements, typically matching standard pipe diameters for fire protection and industrial use.
Combines reducing and flexible functions in one fitting
Saves installation space and reduces joints
Absorbs vibrations and prevents leaks
Streamlines system design and reduces potential failure points
