Alarm Check Valve 4 Inch – Riser Valve for Sprinkler Systems

An alarm check valve is the main control valve at the base of a wet pipe sprinkler system. It does two jobs. It works as a check valve, so water can flow into the sprinkler pipework but cannot flow back. And it raises an alarm when a sprinkler opens. When a sprinkler head operates, water starts to flow through the valve, and the valve clapper lifts. Some of the flow goes to an alarm line, where it can sound a water motor gong outside the building and trigger a pressure switch that signals the fire alarm panel. A retard chamber helps prevent false alarms from small pressure surges in the water supply. This 4 inch (DN100) riser valve suits the main riser of a sprinkler system for a floor or a zone. It is installed with trim parts, which include pressure gauges, a drain, a test valve and the alarm fittings, so check what is included with your unit.

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Alarm Check Valve – Key Features

• Check valve action: stops water from flowing back
• Alarm trigger: sounds a gong and signals the fire panel when a sprinkler opens
• Retard chamber option: reduces false alarms from pressure surges
• 4 inch (DN100) size: for the main riser of a zone
• Works with standard trim and fittings

Alarm Check Valve – Technical Specifications

• Type: Wet pipe alarm check valve
• Size: 4 inch (DN100)
• End connections: flanged or grooved, depending on the model. Check your unit
• Working pressure: commonly 175 psi (about 12 bar) or higher, depending on the model. Check your unit
• Alarm outputs: water motor gong connection and pressure switch connection
• Trim: pressure gauges, drain and test valve. Check what is included
• Standards: UL, FM or similar approvals on many models. Check the label

Who Should Buy This Valve?

• Fire sprinkler system installers
• Contractors for offices, malls and warehouses
• Factories, hotels and hospitals
• Maintenance teams that replace valves
• Building owners upgrading a sprinkler riser

How the Alarm Works

When a sprinkler head opens, water flows through the alarm check valve. The flow lifts the valve clapper and opens a path to the alarm port. Water then runs to the water motor gong and the pressure switch, so people hear the gong, and the fire alarm panel gets a signal. When the flow stops, the alarm line drains. A retard chamber collects small surges so that they do not trigger a false alarm.

Installation and Usage Guide

• Install the valve upright on the riser, with the flow arrow pointing the correct way
• Fit the trim as shown in the manual, including gauges and drain
• Connect the water motor gong and the pressure switch
• Open the main control valve and test the alarm by using the test valve
• Keep the valve area clear and keep the main valve locked open
• Installation should be done by a qualified sprinkler installer

Frequently Asked Questions

What does an alarm check valve do?
It allows water in, stops it flowing back, and raises an alarm when a sprinkler operates.

What is the retard chamber for?
It reduces false alarms from pressure surges.

Does it include the gong and switch?
Please check your unit. Many are sold separately.

What size is it?
4 inch (DN100).

Is it for wet or dry systems?
It is for wet pipe sprinkler systems.

How do I test it?
Use the alarm test valve, as the manual shows.

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