300PSI Butterfly Valve with Gearbox - Grooved End GD-381G

Model: GD-381G Date Updated: August 6, 2026
Prepared by: Fire Protection Valve Technical Department

Categories:

Butterfly Valve

Compliance Credentials: Strictly certified to UL 260 and FM standards for high-hazard critical infrastructure

Butterfly Valve with Gearbox-Grooved End

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300PSI Butterfly Valve with Gearbox - Grooved End GD-381G

▏Product Description

The GD-381G grooved end fire protection valve is manufactured by Ningjin APC Industries specifically for high-rise building standpipes, commercial fire sprinkler loops, and industrial fire protection systems. Designed for efficient installation and tight shutoff, this high-performance butterfly valve conforms to UL 1091, ULC / ORD-C1091, and FM 1112 standards, combining a clear waterway design with an integrated gearbox operator for manual control and flow regulation.

Built with a high-strength ductile iron body and protected by epoxy coating, the GD-381G offers reliable resistance to environmental wear in indoor and outdoor fire protection applications. The disc features resilient EPDM encapsulation for bubble-tight sealing under working pressure up to 300 PSI. Stainless steel shafts and PTFE / C95400 stem bushings provide smooth operation and stability during system operation.

The GD-381G features grooved ends conforming to ANSI/AWWA C606 or metric standards to simplify field installation. Additionally, the top flange conforms to the ISO 5211 mounting standard, facilitating the installation of supervisory switches or actuators when required.

▏Specifications & Engineering Data

Parameter	Technical Requirement / Value
Product Model	GD-381G
Valve Type	Butterfly Valve with Gearbox Operator - Grooved End
Nominal Sizes	2", 2½", 3", 4", 5", 6", 8", 10", 12"
Working Pressure Rating	300 PSI
Shell Hydrostatic Test Pressure	600 PSI
End Connection Standard	Groove Standard: ANSI/AWWA C606 or Metric Standard Clear Waterway design
Design & Testing Certifications	Conforms to UL 1091 & ULC / ORD-C1091 & FM 1112; Certified lead-free by NSF / ANSI 61 & NSF / ANSI 372 is available
Top Flange Mounting Standard	ISO 5211
Working Temperature Range	0~80°C / 32~176°F
Body Material	Ductile Iron
Disc Material	Ductile iron disc– EPDM Encapsulated
Upper Shaft & Lower Shaft Material	Stainless Steel
Bushings & Bearings	PTFE / C95400
Coating Details	Epoxy coated or coating upon request
Application	Indoor & Outdoor Use, Fire inflow water, drain pipe, high-rising building fire fighting system, industrial factory building fire protection system

▏Valve Material List

NO.	Description	Material
1	Upper Shaft Sealing Nut	WCB
2	Shaft Seal	EPDM
3	Body	Ductile Iron
4	Upper Shaft	Stainless Steel
5	Disc+Rubber Seat	Ductile Iron+EPDM
6	Lower Shaft	Stainless Steel
7	Lower Shaft Sealing Nut	WCB
8	Stem Bushing	PTFE / C95400
9	O-Ring	EPDM
10	Gear box

▏Dimensions

Size	A	B	C	D	E	F	G	H	K	J	P	M	N	d	L
2"	110	85	32	60.3	57.15	15.9	7.9	65	151	152	90	70	9	10	81 88
2½"	125	95	32	73 76.1	69.1 72.3	15.9	7.9	65	151	152	90	70	9	10	96.4
3"	140	100	32	88.9	84.9	15.9	7.9	65	151	152	90	70	9	11	97
4"	160	100	32	114.3	110.1	15.9	9.5	65	151	152	90	70	9	14	115.1
5"	170	125	32	139.7 141.3	135.5 137	15.9	9.5	65	151	152	90	70	9	14	132.4 148
6"	190	140	32	165.1 168.3	160.9 164	15.9	9.5	65	146	200	90	70	9	16	132.4 148
8"	230	175	32	219.1 216.3	214.4 211.6	19	11.1	77	233	290	125	102	12	19	133 147.4
10"	260	200	45	267.4 273	262.6 268.3	19	12.7	77	233	290	125	102	12	22	159
12"	300	240	45	318.5 323.8	312.9 318.3	19	12.7	77	226	290	150	125	14	26	165

▏FAQ

Q1: Does the GD-381G grooved end butterfly valve with gearbox meet international fire protection standards UL 1091 and FM 1112?

Yes. The 300PSI butterfly valve with gearbox GD-381G conforms to UL 1091, ULC / ORD-C1091, and FM 1112 standards. It features a 300 PSI working pressure rating and is shell tested to 600 PSI.

Q2: What materials are used for the stem and disc seal in the GD-381G grooved fire butterfly valve?

The GD-381G valve body is made of ductile iron, and the shafts are stainless steel. The disc is ductile iron encapsulated in EPDM rubber, with an operational temperature range of 0~80°C (32~176°F).

Q3: Is the GD-381G grooved butterfly valve certified lead-free?

Yes. Certified lead-free options conforming to NSF / ANSI 61 and NSF / ANSI 372 standards are available upon request.

Q4: What pipe connection sizes are available for GD-381G grooved butterfly valves?

The GD-381G model is available in sizes from 2" to 12" (2", 2½", 3", 4", 5", 6", 8", 10", 12"), featuring grooved end connections that conform to ANSI/AWWA C606 or metric standards.