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Alarm check valves can play an important role in a wet-pipe fire protection system, ensuring reliable detection and notification when a sprinkler activates. Installed on the system riser, these devices prevent reverse flow (backflow) while routing water to the alarm line to trigger an audible alarm, such as a water motor gong or electronic waterflow alarm. When heat opens a sprinkler, and the system activates, water surges through the valve—signaling water flow to first responders and building occupants.
Used in accordance with NFPA 13, an alarm check valve can help support proper installation compliance, depending on the system design, and ensure that a fire sprinkler system notifies of its activation during an emergency.
Shop industry-leading alarm check valves at QRFS, including configurations for various pressures, connection types, and more.
In a wet pipe system—where water remains pressurized in the pipes at all times—the alarm check valve can serve as both a riser check valve and a dedicated alarm check valve. Its internal clapper design keeps water in the sprinkler piping while allowing forward flow during an activation event. As water moves past the clapper, it directs flow into the alarm line to operate a water motor gong or other signaling device.
Because these valves respond consistently and can signal non-electrical water motor gongs, they’re valuable in many systems that need reliable detection and clear communication of system activation. They integrate seamlessly with various fire sprinkler applications.
QRFS offers models compatible with a wide range of sprinkler riser configurations, including valves ranging from 2-1/2 in. to 8 in., various lengths, and flange or grooved connections. Whether you’re replacing an existing part or building out a new system, a well-selected alarm check valve can support clear alert functions and compliance.
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What is an alarm check valve, and how does it work?
An alarm check valve is a specialized type of check valve used in wet pipe fire sprinkler systems. It allows water to flow only toward the sprinkler piping and, when water flows through it (as when a sprinkler opens), it activates an audible local alarm.
Can an alarm check valve be installed in any orientation?
Many alarm check valves are designed to be installed either vertically or horizontally, depending on your system layout. Always follow the manufacturer’s installation instructions to ensure proper installation and performance.
What’s the difference between a regular check valve and an alarm check valve?
A regular check valve simply stops water from flowing backward in the system. An alarm check valve does that and includes an alarm port and mechanism to trigger an alarm during sustained waterflow — combining flow control and notification in one unit.
What materials and design features do alarm check valves have?
Typical alarm check valves have a robust body and a clapper that traps pressurized water on the supply side to prevent backflow. These valves are made for durability and reliable operation in wet pipe systems.
Are alarm check valves always suitable for all fire sprinkler systems?
No. Alarm check valves are generally intended for use in wet pipe automatic sprinkler systems where automatic alarm signaling from water flow is required. They are components in systems that need integrated audible or electric alarm activation.
How do I choose the right alarm check valve for my fire protection system?
Selecting the right valve depends on the system size, pressure requirements, whether you need vertical or horizontal installation, connection type, and other factors. Consult product data sheets and system design documents to ensure compatibility.