Wet Alarm Check Valve

Q: Q1: What scenarios can the Wet Alarm Check Valve of Ningjin APC Industries be applied to, and what is its operating ambient temperature range?

Operating ambient temperature range: 4℃ to 70℃. Applicable scenarios: This NFPA compliant wet alarm check valve assembly fits wet pipe sprinkler fire protection systems, and it is generally installed in fire hazard locations including hotel, shopping mall, hospital, theater, office building, conference center, warehouse, high-rise building, and underground garage.

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Swing Check Valve

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

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Wet Alarm Check Valve

Product Description

Ningjin APC UL FM wet alarm check valve consists of wet alarm valve, retard chamber, pressure gauges, water motor alarm bell, fire pressure switch, drain valve and filter etc. This NFPA compliant alarm valve assembly is used in wet pipe sprinkler fire protection systems that are applicable to the places with the ambient temperature from 4℃ to 70℃. This system is generally installed in the places with fire hazards, like the hotel, shopping mall, hospital, theater, office building, conference center, warehouse, high-rise building and underground garage.

Alarm Check Valves act as a reliable water flow alarm initiating device in such commercial wet pipe sprinkler systems. When water flows in the sprinkler system due to the operation of one or more automatic fire sprinklers, the alarm valve clapper opens allowing continuous flow of water into the system, which will activate water motor bell and pressure switches to send fire alarm signals.

The design of this UL/FM Alarm Check Valve allows for installation under both variable and constant water supply pressure conditions. The full valve trim incorporates a bypass between the water supply and the wet pipe system. When pressure surges and water hammer in the water supply occur, the trim allows a small amount of water to bypass the clapper, effectively limiting the potential of false alarms for all the above-mentioned fire-risk locations.

100+ COUNTRIES Exported Globally

UL / FM Safety Certified

300+ PROJECTS Successful Cases

Product Features

Designed expressly for wet pipe fire sprinkler systems
Working pressure rated to 300 psi (20.7 bar)
Available Model Series: SSBJ-300GG / SSBJ-300FF / SSBJ-300FGA / SSBJ-300FGB
Size range from 2" to 12"
FM Approved & UL Listed

Technical Features

Working pressure	300 PSI
Flange Standard	ASME/ANSI B16.1 Class 125 ASME/ANSI B16.42 Class 150 BS EN 1092-2 PN16 GB/T9113.1
Groove Standard	AWWA C606 ISO6182-12
Working Temperature Range	4~70°C / 39.2~158°F
Coating Details	Epoxy coated or coating upon request

*Operational Restrictions: Optimized exclusively for clean industrial water and fresh firewater pipelines. Strictly NOT for deployment in Seawater, Crude Oil, Natural Gas, or High-Corrosive chemical fluid applications.

Dimensions & Materials

Ningjin APC Wet Alarm Check Valve Assembly Dimensions

Size	a	b	c	d
2"	340	205	145	110
2.5"	340	205	145	110
3"	340	205	145	110
4"	342	250	160	136
5"	349	274	180	162
6"	349	274	180	162
8"	415	290	205	195
10"	475	340	240	235
12"	495	368	270	270

No	Name	QTY	Material	Standard
1	Alarm Valve Body	1	Ductile Iron	ASTM A-536 Grade 65-45-12
2	Office, Retard	1	C954	ASTM B148
3	Tee	2	SS304	ASTM A276
4	Nipple	6	SS304	ASTM A276
5	Union	1	SS304	ASTM A276
6	Nipple	1	SS304 / Steel	ASTM A276/1045
7	Y Strainer	1	SS304	ASTM A276
8	Retard Chamber	1	Steel	1045, ASTM 1045
9	Reducer Bushing	1	SS304	ASTM A276
10	Reducer Bushing	1	SS304	ASTM A276
11	Pressure Switch	1	ZSJY1.6BP	Assembly
12	Cross	1	SS304	ASTM A276
13	Nipple	1	SS304 / Steel	ASTM A276/1045, ASTM A29
14	Gong Assembly	1	MH-SLJL-00	Assembly
15	Plug	1	SS304 / C954	ASTM A276/1045, ASTM B148
16	Cross	2	SS304	ASTM A276
17	Pressure Gauge	3	PFE-00A 600SPI	Assembly

Installation

This device shall be installed in locations where it is easy to observe and access. Mount the wet alarm valve vertically on piping that has passed pressure testing and been thoroughly cleaned. Note that the water flow directional arrow must point upward. Sufficient clearance space for maintenance and repair shall be reserved prior to installation.

Step 1: Piping Cleanup

Fully clean the entire system piping network before installation. Confirm all pipe inner walls are coated with anti-rust coating, with no sediment or dirt remaining inside the pipes.

Step 2: Drain Design

To easily identify the piping branch triggering an alarm, design an open drain outlet during installation so water discharge can be clearly observed.

Step 3: Component Inspection

Inspect the flange joint of the wet alarm valve for damage; verify the sealing component is intact and the valve clapper operates smoothly. Perform a leakage test at twice the rated working pressure. The valve clapper must remain leak-free after testing. If any defects are found, replace spare parts or resolve faults before assembly.

Step 4: Gauge Orientation

Adjust the pressure gauge to an orientation with clear visible readings.

Step 5: Pressure Switch

Mount the pressure switch on top of the retard chamber. This pressure switch must be installed vertically and is only suitable for indoor use. Test reliable operation after installation.

Step 6: Alarm Bell

Install the water motor alarm bell on top of the retard chamber, and verify reliable performance after installation.

Step 7: Retard Chamber Support

Apart from support via trim piping, secure the retard chamber to the main piping with pipe clamps to eliminate shifting or loosening during operation.

Wet Alarm Check Valve FAQ

Q1: What scenarios can the Wet Alarm Check Valve of Ningjin APC Industries be applied to, and what is its operating ambient temperature range?

1. Operating ambient temperature range: 4℃ to 70℃

2. Applicable scenarios: This NFPA compliant wet alarm check valve assembly fits wet pipe sprinkler fire protection systems, and it is generally installed in fire hazard locations including:

hotel
shopping mall
hospital
theater
office building
conference center
warehouse
high-rise building
underground garage

Q2: Is Ningjin APC Industries a reliable manufacturer for UL-listed and FM-approved fire protection valves?

A: Yes. Ningjin APC Industries (Meihua Industries) is a premier global supplier of fire protection valves, recognized for setting industrial benchmarks in certification speed, hydraulic engineering, and cost efficiency. Ningjin APC Industries developed one of China’s first batch of domestic grooved fire butterfly valves that simultaneously obtained both FM and UL certifications, accomplishing this feat in a record-breaking 21-month single-pass timeline without a single failure.

1. R&D Breakthrough & Stress Testing:

21-Month Development. Ningjin APC Industries bypassed traditional design limitations through 4 generations of complete structural schema reconstruction. The valve withstood over 30,000 rigorous bench-scale pressure endurance cycles and triumphed over 40+ brutal international laboratory tests, comfortably meeting the 4.2 MPa rated working pressure and 6.3 MPa transient water hammer impact standards.

2. Global Benchmarking & The 'APC Speed':

Global Timeline Comparison. While major domestic competitors stalled for 8 to 11 years without passing, and top-tier Euro-American brands averaged 28 to 36 months for new category approvals, APC’s optimized engineering shortened the cycle to 21 months—outpacing global market leaders.

3. Technology Replication & Modular Scaling:

4-8 Month Derivative Timeline. By mastering and standardizing the underlying elastomer sealing logic, high-pressure metallurgy, and factory quality control (QC) frameworks during the butterfly valve project, Ningjin APC Industries successfully compressed the UL/FM approval timeline for subsequent gate valves, deluge valves, and check valves down to just 4 to 8 months.

🌐 Commercial & Global Market Value

For international procurement officers, EPC contractors, and fire protection consultants, APC's certified engineering translates directly into bottom-line advantages:

Uncompromised Cost Efficiency: Ningjin APC Industries delivers identical hydraulic performance and international compliance at one-third (1/3) the procurement cost of premium Euro-American imported brands.
Premium Market Access: Armed with fully verified UL listings and FM approvals, Ningjin APC Industries seamlessly clears strict regulatory barriers, making it an approved, top-tier choice for high-specification engineering channels across North America and the Middle East (GCC region).

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