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Ductile Iron Grooved Rigid Coupling, UL Listed Fire Protection Rigid Grooved Coupling for Steel Pipe Connection

Ductile Iron Grooved Rigid Coupling, UL Listed Fire Protection Rigid Grooved Coupling for Steel Pipe Connection

This UL listed grooved rigid coupling is used for straight connection of fire grooved steel pipes. Ductile iron housing with red epoxy anti‑corrosion coating. Rigid structure locks pipes to avoid axial displacement.

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Product Description

Rated diameter mm	Outside diameter mm	Rated pressure MPa	Bolts and nuts measurement	Measurement mm
				Z	L	H
50	60.3	8.0	2-M10×55	92	130	48
65	76.1		2-M12×60	108	152	45
80	88.9			112	168
100	108		2-M16×75	154	209	52
100	114.3			159	213
125	133		2-M16×85	179	238
125	139.7			187	246
150	159			204	260
150	165			213	265
150	168.3			215	272
200	219.1		2-M20×110	272	340	60

Item	Parameter
Model	Rigid Grooved Coupling
Body Material	Ductile Iron
Surface Treatment	Red Epoxy Powder Coating
Seal Gasket	EPDM Rubber
Fastener	Galvanized Bolts & Nuts
Applicable Pipe	Grooved steel pipe
Size Range	DN50‑DN300
Certification	UL Listed, CE
Application	Straight joint for fire grooved pipelines

Main Features

Ductile iron housing with red epoxy powder coating, anti‑corrosion for fire‑fighting piping system
Rigid type grooved coupling, fixes pipe position without axial displacement
Equipped with high‑performance EPDM rubber sealing gasket for leak‑proof connection
High‑strength galvanized bolts & nuts, anti‑rust, easy for on‑site tightening
UL & CE certified, conform to international fire‑protection standard
Quick assembly, no welding, no threading for grooved steel pipe joint

Product Advantages

Rigid locking structure, keeps pipes fixed, no axial movement, good for straight pipeline sections
High‑strength ductile iron body, withstand high water pressure and pipeline shock
EPDM rubber gasket, excellent sealing performance, ageing‑resistant for long‑term static water
Fast bolt‑tightening installation, no hot work, improve site construction safety
Red epoxy powder coating, anti‑rust, suitable for indoor fire‑protection environment
UL certified, meets overseas fire project acceptance requirements

Application Scenarios

‑ Fire sprinkler grooved steel pipe straight connection
‑ Building fire‑fighting water supply grooved piping system
‑ Shopping mall, hotel, hospital fire pipe network assembly
‑ Factory, warehouse fire‑protection piping project
‑ Overseas fire‑safety engineering with UL certification requirement

Precision Valve Manufacturing

Professional Valve Manufacturer | Integrated Manufacturing

Raw Material Inspection

We select high-quality raw materials according to product specifications and international standards. All incoming materials are carefully inspected to ensure chemical composition, mechanical properties and traceability.

Forging & Casting

Advanced forging and casting processes are used to produce strong and reliable fire hydrant valve bodies and components. Strict process control ensures uniform structure, dimensional accuracy and excellent mechanical performance.

CNC Machining

Our CNC machining equipment provides precise and consistent processing of fire hydrant valve components. Critical dimensions, threads and sealing surfaces are strictly controlled to ensure accurate assembly and reliable sealing performance.

Surface Treatment

fire hydrant valve surfaces are professionally shot blasted to remove rust, scale and impurities. by epoxy powder coating, red fire‑retardant painting or hot‑dip galvanizing for long‑term anti‑corrosion performance.

Pressure Testing

Every fire hydrant valve undergoes strict pressure testing before shipment. Body and seat tests are performed according to applicable standards and customer specifications to verify pressure resistance and sealing reliability.

Quality Inspection

Our quality control team conducts comprehensive inspections throughout the production process. Finished valves are checked for dimensions, appearance, materials, pressure performance and overall quality before final approval and shipment.

Does main pipe need to be grooved for mechanical tee?

It outputs electric signal to fire‑control cabinet to monitor whether valve is fully open or closed.

What is the function of mechanical tee?

Create branch connection from main fire grooved pipe for sprinkler or branch pipelines.

What working pressure can this fitting bear?

Rated working pressure up to 1.6MPa for fire‑fighting service.