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A reducing flexible coupling is a critical component in piping systems, specifically engineered to connect pipes of varying diameters while maintaining flexibility, absorbing vibrations, and facilitating straightforward installation. Developed for high-pressure applications, this coupling is widely utilized in fire protection systems, HVAC (Heating, Ventilation, and Air Conditioning) setups, and industrial piping networks. Its design eliminates the need for concentric reducers and additional joints, streamlining system configurations and reducing potential leak points.
Crafted from high-strength ductile iron conforming to standards such as ASTM A536, GRADE 65-45-12, and QT450-10, the coupling ensures durability and resistance to pressure and corrosion. The sealing mechanism relies on EPDM or NBR gaskets (with other materials available for specific applications), which provide reliable, leak-free performance under operational pressure.
Surface treatments include electrophoretic painting, electroplating, epoxy coating, and hot-dip galvanizing, enhancing longevity and compatibility with diverse environmental conditions.
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) |
The reducing flexible coupling is versatile across multiple industries:
Fire Protection Systems: Ensures secure connections in sprinkler and standpipe networks, withstanding high water pressure during emergencies.
HVAC Systems: Accommodates thermal expansion and contraction in heating and cooling pipelines, reducing stress on the system.
Industrial Piping: Suitable for water treatment, mining, and manufacturing facilities, where pipe diameter transitions and vibration absorption are critical.
Simplified System Design: Eliminates the need for concentric reducers and extra joints, reducing material costs and installation time.
Flexibility: Absorbs vibrations and accommodates minor misalignments, extending the lifespan of connected pipes.
Leak Prevention: The combination of ductile iron construction and precision gaskets ensures a tight seal under pressure.
Compliance: Meets international standards for material quality and performance, suitable for global markets.
As a foundational component in modern piping systems, the reducing flexible coupling balances functionality, durability, and ease of use. Its adaptability to varying pipe diameters and operating conditions makes it a preferred choice for fire protection, HVAC, and industrial applications, supported by rigorous testing and compliance with global standards. For technical inquiries or bulk orders, contact the manufacturer for detailed specifications tailored to specific project needs.
