UL/FM 300PSI Butterfly Valve c/w Signal Gearbox- Wafer End WD-371X

Name: UL/FM Butterfly Valve c/w Signal Gearbox- Wafer End WD-371X
Brand: Ningjin APC Industries
SKU: WD-371X-WAFER-SERIES
Availability: InStock

Model: WD-371X 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 c/w Signal Gearbox

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0086-18600252968

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UL/FM 300PSI Butterfly Valve c/w Signal Gearbox- Wafer End WD-371X

▏Product Description

As a premier UL/FM butterfly valve manufacturer, Ningjin APC Industries delivers high-performance fire protection fluid control solutions designed for critical commercial and industrial infrastructure. The UL/FM Butterfly Valve c/w Signal Gearbox- Wafer End WD-371X is engineered specifically for indoor and outdoor fire protection systems, including fire inflow water lines, drain pipes, and high-rise building standpipe networks. Built with a heavy-duty ductile iron body, a 416 stainless steel stem, and an EPDM fully encapsulated disc, this valve ensures zero-leakage sealing, exceptional corrosion resistance, and prolonged operational life. Featuring an integrated supervisory signal gearbox with ISO 5211 mounting compatibility, it provides real-time monitoring of valve position to prevent accidental shutoff. Operating seamlessly under a maximum working pressure of 300 PSI (600 PSI test pressure) and across temperatures from 0 to 80°C (32~176°F), the WD-371X delivers uncompromised reliability matching leading international brands with fast delivery turnaround.

▏Technical Features

Connection Standard	ANSI125/150, DIN2501 PN10/16
Sizes	2", 2½", 3", 4", 5", 6", 8", 10", 12"
Approvals	UL, CUL, FM, NSF / ANSI 61 & NSF / ANSI 372, VDS, CCC
Maximum Working Pressure	300 PSI
Maximum Testing Pressure	600 PSI
Pressure Standard	Pressure conforms to UL1091 & ULC / ORD-C1091 & FM 1112
Working Temperature Range	0~80°C / 32~176°F
Coating Details	Epoxy coated or coating upon request
Disc Specification	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	End Face Seal	EPDM
9	Stem Bushing	PTFE / C95400
10	O-Ring	EPDM
11	Gearbox

▏Dimensions

Size	A	B	C	D	H	K			J	P	M	N	d	L
2"	110	85	36	100	111	153	218	127	86	90	70	9	12	42
2½"	125	95	32	112	111	153	218		152	90	70	9	10	44.2
3"	140	100	32	120	111	153	218		152	90	70	9	11	45.3
4"	160	100	32	161	111	153	218		152	90	70	9	14	52
5"	170	125	32	182	111	153	218		152	90	70	9	14	54.4
6"	190	140	32	216	111	153	218		200	90	70	9	16	55.8
8"	230	175	32	260	126	210	232		300	125	102	12	19	60.5
10"	260	200	63	320	161	210	232		350	125	102	12	30.5	66.5
12"	300	240	77	375	161	249			350	150	125	14	33	76.9

▏Gearbox Material List

NO.	Description	Material
1	Gear Body	Ductile Iron
2	Gear Cover	Ductile Iron
3	Worm Wheel	Ductile Iron
4	Indicator	Ductile Iron
5	Worm	Steel
6	Handwheel Shaft	Steel
7	Pin	416 Stainless Steel
8	Pin	416 Stainless Steel
9	Handwheel	Ductile Iron
10	O-Ring	EPDM
11	Set Screw	Steel
12	Signal Switch	Switch Assembly
13	Clip	Nylon
14	Sealing Ring	EPDM
15	Wire	Wire
16	Gasket	EPDM

▏Gearbox Dimensions

Gearbox	Valve	A		B	C	D	E	F	G	H	M
24:1	2"-2½"	153	218	164	45	152	70	65	58	10	M8
24:1	3"	153	218	164	45	152	70	65	58	11	M8
24:1	4"-5"	153	218	164	45	152	70	65	58	14	M8
24:1	6"	153	218	164	45	200	70	65	58	16	M8
30:1	8"	210	232	205	63	300	102	79	67	19	M10
30:1	10"	210	232	205	63	300	102	79	67	22	M10
80:1	12"	249		284	120	350	125	118	110	24	M12

▏FAQ

What are the pressure pressure ratings and approval standards for the Butterfly Valve c/w Signal Gearbox- Wafer End WD-371X?

The WD-371X is certified for a maximum working pressure of 300 PSI and hydrostatically tested up to 600 PSI. Its pressure design conforms to UL 1091, ULC / ORD-C1091, and FM 1112 standards. Official global approvals include UL, CUL, FM, VDS, and CCC, ensuring total compliance for commercial and high-rise fire protection standpipe systems.

What BOM materials ensure corrosion resistance in the stem and disc assembly of the WD-371X wafer butterfly valve?

The valve features dual upper and lower shafts made from high-strength 416 Stainless Steel, paired with a Ductile Iron disc encapsulated in resilient EPDM rubber. Stem sealing is reinforced with EPDM O-rings, a PTFE/C95400 stem bushing, and a WCB sealing nut, preventing internal corrosion and rubber degradation over long operational life cycles.

How does the supervisory signal gearbox integrate with fire alarm monitoring panels?

The WD-371X comes equipped with a factory-installed gear operator and internal micro-switches designed according to the ISO 5211 top flange standard. This ISO 5211 signal gearbox butterfly valve configuration connects directly to the building’s fire control panel, transmitting real-time tamper signals whenever the valve disc is moved from the fully open position.

Is the WD-371X wafer butterfly valve suitable for potable water applications?

Yes. While primary applications focus on fire inflow water and drain pipes, the WD-371X offers optional lead-free certification certified to NSF / ANSI 61 and NSF / ANSI 372 standards. Combined with non-toxic epoxy coatings, it is ideal for dual-use fire and potable water lines upon request.

What flange end connections and sizes are available for replacement projects?

The WD-371X features a compact wafer end connection compatible with both ANSI 125/150 and DIN2501 PN10/16 flange patterns. Available nominal sizes range from 2" to 12" (2", 2½", 3", 4", 5", 6", 8", 10", and 12"), allowing seamless retrofit and replacement in standard fire piping layouts.

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