Reducing Flexible Coupling for Fire Protection Systems – China Manufacturer

Our reducing flexible coupling is designed to connect pipes of different diameters while allowing for flexibility, vibration absorption, and easy installation. Made from high-strength ductile iron and fitted with EPDM or NBR gaskets, it provides a secure, leak-free connection under pressure. Ideal for fire protection, HVAC, and industrial piping systems, this coupling simplifies system design by eliminating the need for concentric reducers and additional joints.

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Product Description

Our reducing flexible coupling is designed to connect pipes of different diameters while allowing for flexibility, vibration absorption, and easy installation. Made from high-strength ductile iron and fitted with EPDM or NBR gaskets, it provides a secure, leak-free connection under pressure. Ideal for fire protection, HVAC, and industrial piping systems, this coupling simplifies system design by eliminating the need for concentric reducers and additional joints.

Material: ASTM A536,GRADE 65-45-12,QT450-10
Threads: ASME B1.20.1,ISO 7-1,BS21,BSPT,NPT,GB 7306
Size: ISO6182,AWWA C606
Size Available: 1"-24"
Surface Treatment: Electrophoretic painted
Electroplated, Epoxy, Hot-dip Galvanized

Air pressure and holding pressure schedule
NO.	Size	Pressure	Time to keep the pressure	Remark
1	≤DN50	≥0.5MPa	≥5s	Air pressure
2	>DN50~DN350	≥0.5MPa	≥10s	Air pressure
3	>DN350	1.5times the rated working pressure	5min	water pressure

Rubber gasket
Name	Recommended Application Medium	Related Standards	Recommended Application Temperature Range
E:EPDM	water supply,drainage, sewage,normal temperature air,weak acid,and weak alkali	GB5135.11	-30℃~+130℃
		GB/T 21873	-22°F~+266°F
	continuous supply of 110℃ hot water	GB/T 27572
D:NITRILE	petroleum,vegetable oil, mineral oil	GB5135.11	-20℃~+80℃
D:NITRILE	petroleum,vegetable oil, mineral oil	GB/T 23658	-4°F~+176°F
S:SIUCON	drinking water	GB/T 28604	-40℃~+180℃
S:SIUCON	high-temperature dry air and some high-temperature chemicals	GB5135.11	-40°F~+356°F
F:FLUORINE	the acid,alkaline solution,and hot lubricating oil	HG/T 2181	-20℃~+180°
F:FLUORINE	the acid,alkaline solution,and hot lubricating oil	HG/T 2181	-4°F~+356F
V:NEOPRENE	seawater		'-20°℃~+100℃ -4°F~+212°F

reducing coupling 图纸

Installation instruction for Flexible coupling &Rigid coupling


1Take out the Flexible &Rigid coupling	2Split the Flexible &Rigid coupling	3pipe preparation	4Lubricate gasket

5Gasket installation	6Housing installation	7Tighten nuts	8installation completed Grooved coupling