FM Approved Dedicated Hydraulic Alarm Bell for Alarm Valve Set (Model F-2 Fire-Fighting Hydraulic Alarm Bell)

The Model F-2 FM Approved Dedicated Hydraulic Alarm Bell for Alarm Valve Set is a core component specifically designed for automatic fire sprinkler systems. It realizes an electroless-triggered mechanical alarm function through hydraulic drive and is suitable for various places requiring high-reliability fire protection.
FM-certified F-2 type water flow alarm provides a reliable, cost-effective, and compliant solution for modern fire protection systems, serving as a critical device to safeguard lives and property.

● Model：F - 2 type
● Color：Fire red / Customized
● Start - up flow：≤1.5L/min
● Rated working pressure range：0.14MPa～1.6MPa
● Shell material：Environmentally friendly brass or stainless steel
● Inlet connection：Threaded connection
● Operating temperature range：4℃～70℃
● Storage temperature range：-20℃～80℃
● OEM Service：Accepted
● Delivery Terms：FOB, CFR, CIF, EXW
● Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

Fire alarm valve

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Email:

linhaifeng117@gmail.com

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Product Details

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Product Formation

The FM-certified Hydraulic Alarm Bell Model F-2 (hereinafter referred to as "Model F-2 Hydraulic Alarm Bell") is a specialized fire alarm device designed for automatic sprinkler system alarm valve assemblies. Its primary function is to emit high-decibel audible alerts triggered by water flow during fire emergencies, prompting timely human response. Designed, manufactured, and performing in strict compliance with FM Global (Factory Mutual) fire protection standards (such as FM 1125 "Components for Automatic Sprinkler Systems") and relevant Chinese GB 5135 series specifications, it features high reliability, low activation flow rate, and extended service life. This device serves as a critical audible alarm component in wet-pipe, dry-pipe, and pre-action automatic sprinkler systems.

The F-2 type water motor alarm is widely used in commercial buildings, hospitals, data centers, and other locations with high requirements for fire protection reliability. It is paired with wet alarm valves and dry alarm valves, serving as the "final audible alarm" in automatic sprinkler systems. Its low activation flow design makes it suitable for retrofitting older systems (avoiding insufficient flow due to pipe corrosion), while its highly corrosion-resistant materials withstand harsh water conditions. This solution balances compliance and practicality in fire alarm systems.

The F-2 Water Motor Gong, through precise requirement definition, high-quality material selection, advanced manufacturing processes, and rigorous FM certification testing, has established its core advantages of "high-sensitivity triggering, high-intensity alarm, and long-term stable performance." It has become a reliable acoustic alarm core component in automatic sprinkler systems.

KEY WORDS： FM-approved water motor alarm，Fire Hydraulic Alarm Bell，Dedicated Hydraulic Alarm Bell for Alarm Valve Set，F-2 Hydraulic Alarm Bell，F-2 Type Fire Hydraulic Alarm Bell (Special for Alarm Valve Set)，FM-certified F-2 type water motor gong，China, manufacturers, suppliers, wholesale, factory.

Other Classifed Products：

Fire Hose Categories, Fire Sprinkler System, Fire Protection Valve , Fire Hose Reel&Cabinet , Fire Foam Equipment，Fire Nozzle and Fire Monitor , Fire Hydrant , UL/FM Fire Fighting Equipment , Brass Valve Categories , Fire Extinguisher Series .

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Product Features

The FM-certified F-2 Model Hydraulic Alarm Bell (hereinafter referred to as the "F-2 Hydraulic Alarm Bell") is a core audible alarm component in automatic sprinkler systems, featuring the following characteristics:

Ultra-low activation flow: Triggered with just 1.5L/min, ideal for retrofitting aging systems or scenarios with flow reduction due to pipe corrosion, preventing delayed alarms from insufficient flow.
Rapid response time: Activates within ≤5 seconds after the alarm valve opens, ensuring prompt alerts during early fire stages to facilitate evacuation and firefighting.
High sound output: Produces ≥75dB at 1-meter distance (exceeding 85dB in some conditions), delivering clear alarms even in noisy industrial environments or large spaces (e.g., warehouses, stadiums).
Directional sound transmission: Spiral resonance chamber and curved impeller optimize soundwave diffusion, minimizing attenuation for uniform 360° coverage without dead zones.
Clog-resistant flow path: CFD-optimized internal channels reduce water stagnation, paired with detachable filter screens (optional) to trap sediment/rust debris, preventing impeller jams.
Lubrication-free design: Ceramic bearings and reinforced nylon impeller are self-lubricating, eliminating oil maintenance while preventing fluid contamination, aligning with eco-friendly fire protection.
Transparent inspection cover: Features a view window or quick-access panel for visual impeller/contamination checks without disassembly during routine maintenance.
Multi-scenario application: Suitable for commercial complexes, high-rises, hospitals, airports, data centers, etc., particularly critical zones demanding high sensitivity and reliability.

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Product Parameter

Item	Parameter/Description
Model	F - 2 type
Color	Fire red / Customized
Start - up flow	≤1.5L/min (triggers an alarm within 30 seconds under the working pressure of 0.1MPa)
Rated working pressure range	0.14MPa～1.6MPa (max. pressure resistance is 2.5MPa, no deformation or leakage after maintaining pressure for 5 minutes)
Shell material	Environmentally friendly brass or stainless steel
Inlet connection	Threaded connection
Operating temperature range	4℃～70℃ (conventional water temperature of the fire protection system)
Storage temperature range	-20℃～80℃

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FAQ

Q: Can you accept sample order?

A: Yes, we accept samples with little and reasonable charge.But need customer pay sample fees and transport fees first.

Q: What is your payment terms?
A: Payment supports T/T, L/C, etc.

Q: How can l get my order?
A: We will send you the goods by UPS,DHL,FedEx,Oversea Shipment or other forwarder, all with tracking number.

Q: Why choose us?
A： With over 15 years of experience in the fire protection industry, our company has professional technical personnel and many well-known partners in the domestic market. We offer favorable prices and guarantee quality, having passed multiple certifications!

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With more than 15 years of experience serving clients, we have developed extensive expertise and in-depth industry knowledge, enabling us to deliver reliable and effective solutions tailored to your requirements.
We provide professional technical support and customized service offerings. Our committed technical team is available to assist you with product consultation, installation guidance, and comprehensive after-sales support whenever necessary.
At Sheng Feng Fire, our professionals are dedicated to helping you select the most suitable products based on your specific needs.
Please do not hesitate to contact us for further information！