UL/FM Butterfly Valve c/w Signal Gearbox - Grooved End & Grooved Flanged End

HGD-381X-175/HFGD-381X-175/HGD-381X/HFGD-381X
Date Updated: July 29, 2026
Prepared by: Fire Gate Valve Technical Department

Categories:

Butterfly Valve

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

Butterfly Valve c/w Signal Gearbox

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UL/FM Butterfly Valve c/w Signal Gearbox - Grooved End & Grooved Flanged End

▏Product Description

The UL/FM Butterfly Valve c/w Signal Gearbox - Grooved End & Grooved * Flanged End (Models: HGD-381X-175 / HFGD-381X-175 / HGD-381X / HFGD-381X) engineered by Ningjin APC Industries is a premium flow control solution designed specifically for demanding fire protection systems. As a leading UL/FM butterfly valve manufacturer, APC integrates heavy-duty ductile iron bodies with fully EPDM encapsulated discs to ensure bi-directional bubble-tight shutoff, corrosion resistance, and low operating torque across commercial and industrial fire safety infrastructure.

Featuring a maximum working pressure of 300 PSI and a shell testing pressure of 600 PSI, this valve pressure conforms to UL 1091 & ULC / ORD-C1091 & FM 1112 requirements. It is built with dual 416 stainless steel upper and lower shafts, robust WCB sealing nuts, and self-lubricating PTFE / C95400 stem bushings. Available in versatile end connections—including Grooved End, Grooved * Flanged End, and Flanged * Grooved End per ANSI/AWWA C606 or metric standards—it incorporates an integrated signal gearbox and ISO 5211 top flange for effortless supervisory switch monitoring in high-rise building standpipe systems, drain lines, and industrial fire networks. Lead-free options certified to NSF/ANSI 61 & NSF/ANSI 372 are available upon request.

▏Technical Features

Groove Standard	ANSI/AWWA C606 or Metric Standard Clear Waterway design
Connections	Grooved End / Grooved * Flanged End / Flanged * Grooved End
Sizes	2½", 3", 4", 6", 8", 10"
Approvals	UL, CUL, FM, NSF/ ANSI 61 & NSF/ ANSI 372
Maximum Working Pressure	300 PSI
Maximum Testing Pressure	600 PSI
Pressure Conformance	Pressure conforms to UL1091 & ULC / ORD-C1091 & FM1112
Working Temperature Range	0~80°C / 32~176°F
Coating Details	Epoxy coated or coating upon request.
Disc Construction	Ductile iron disc– EPDM Encapsulated
Top Flange Standard	ISO 5211
Lead-Free Option	Certified lead-free by NSF/ ANSI 61 & NSF/ ANSI 372 is available
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	416 Stainless Steel
5	Disc+Rubber Seat	Ductile Iron+EPDM
6	Lower Shaft	416 Stainless Steel
7	Lower Shaft Sealing Nut	WCB
8	Stem Bushing	PTFE / C95400
9	Signal Gearbox
10	Plug	C95400

▏Dimensions

Size	A	B	C	D	E	F	G	H	K	J	L	M	N	P
2½"	125	95	32	73 76.1	69.1 72.3	15.9	7.9	111	153	152	152.4	139.7	4	19
3"	140	100	32	88.9	84.9	15.9	7.9	111	153	152	158.8	152.5	4	19
4"	160	100	32	114.3	110.1	15.9	9.5	111	153	152	168.4	190.5	8	19
6"	190	140	32	165.1 168.3	160.9 164	15.9	9.5	111	153	200	177.8	241.3	8	22
8"	230	175	32	219.1 216.3	214.4 211.6	19	11.1	126	230	290	203	298.5	8	22
10"	260	200	45	267.4 273	262.6 268.3	19	12.7	126	230	290	203	362	12	25.4

▏FAQ

Q1: What pressure rating and fire protection safety standards apply to the HGD-381X series grooved butterfly valve?

The HGD-381X and HFGD-381X series signal gearbox butterfly valves feature a maximum working pressure of 300 PSI and a shell/seat testing pressure of 600 PSI. Their pressure designs strictly conform to UL 1091, ULC / ORD-C1091, and FM 1112 standards. Official UL, CUL, FM, and NSF/ANSI approvals ensure compliance across high-rise standpipe lines and industrial fire protection networks.

Q2: Which materials are specified for the stem, disc, and internal components to prevent corrosion in fire pipelines?

Constructed with a heavy-duty Ductile Iron body, the valve features an EPDM fully encapsulated Ductile Iron disc (Item 5) for zero-leakage sealing. The stem utilizes dual 416 Stainless Steel upper and lower shafts (Items 4 & 6) guided by wear-resistant PTFE / C95400 stem bushings (Item 8) and secured with WCB sealing nuts, ensuring smooth torque performance in 0~80°C operating environments.

Q3: How do the grooved and grooved-flanged end connections integrate with standard fire protection piping systems?

The series supports Grooved End, Grooved * Flanged End, and Flanged * Grooved End configurations according to ANSI/AWWA C606 or metric clear waterway standards. For detailed layout planning and mounting options, check our grooved fire protection butterfly valve series, which comes pre-equipped with an integrated signal gearbox and ISO 5211 top flange.

Q4: Are these grooved signal butterfly valves suitable for dual fire inflow and potable water systems?

Yes. While standard models feature durable epoxy coating for fire protection water and drain lines, certified lead-free options complying with NSF / ANSI 61 and NSF / ANSI 372 standards are available upon request, enabling safe specification in municipal drinking water and fire supply dual-use lines.

Q5: What sizes and key dimensions are available for EPC contractor site installation planning?

The product line spans nominal sizes from 2½" to 10". Key dimensions include face-to-face values (L) ranging from 152.4 mm for 2½" up to 203 mm for 10", with flange bolt hole counts (N) of 4, 8, or 12 depending on model size, facilitating drop-in replacement and fast field assembly.

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