China Manufacturer of FM/UL Listed Shouldered Coupling

Our shouldered couplings are specially designed for high-pressure piping systems using shouldered-end steel pipes. Made of durable ductile iron and equipped with high-quality EPDM or NBR gaskets, they ensure a reliable, leak-free connection even in demanding environments such as mining, tunneling, and water infrastructure projects.
Easy to install and remove, they are ideal for quick assembly, system maintenance, and long-term performance.

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Shouldered Coupling Grooved Pipe Joint HVAC pipe connector Fire Protection Pipe Coupling Ductile Iron Reducing Coupling Flexible Pipe Coupling Grooved Reducing Coupling FM UL Listed Reducing Coupling Reducing Coupling for Water Treatment Systems Grooved Pipe Connector for Mining Applications

Product Description

Our shouldered couplings are specially designed for high-pressure piping systems using shouldered-end steel pipes. Made of durable ductile iron and equipped with high-quality EPDM or NBR gaskets, they ensure a reliable, leak-free connection even in demanding environments such as mining, tunneling, and water infrastructure projects.

Easy to install and remove, they are ideal for quick assembly, system maintenance, and long-term performance.

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

shouldered_副本

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