Wet Alarm Valve System and Equipment
A wet alarm valve system is the main control station of a sprinkler installation whose pipes are always filled with pressurised water. When a sprinkler opens and water starts to flow, the alarm valve clapper lifts, water enters the alarm line and both the water motor gong and the pressure switch raise the alarm.
The system consists of an alarm valve, retard chamber, water motor alarm gong, pressure switch, gauges and test and drain valves. It is the most common sprinkler system for offices, hotels, malls and production areas without freezing risk.
Main Applications
- Heated office and residential buildings
- Hotel, hospital and school installations
- Malls and heated car parks
- Production and storage areas
- Technical spaces without freezing risk
Technical Data
| System type | Wet pipe sprinkler control station |
|---|---|
| Main element | Clapper-type alarm valve |
| False alarm prevention | Retard chamber |
| Mechanical alarm | Water motor alarm gong |
| Electric alarm | Pressure switch (to fire panel) |
| Pressure monitoring | Inlet and outlet gauges |
| Testing | Alarm test valve and drain |
| Size and connection | By model (please ask) |
| Approval | UL / FM / VdS certificate by model |
Material Options
| Part | Function |
|---|---|
| Alarm valve | Opens on water flow and feeds the alarm line |
| Retard chamber | Delays the alarm during short pressure surges |
| Water motor gong | Gives a mechanical audible alarm without power |
| Pressure switch | Sends the alarm to the fire panel |
| Gauges | Show pressure before and after the valve |
Which material? As no ready product is listed in the store for this system, size, connection type and approval certificate are defined with you per project; a monitored butterfly or OS&Y valve serves as the station’s main control valve.
Advantages
Fast Response
- Pipes are full, water discharges immediately
Simple Design
- No air or compressor needed
Dual Alarm
- Mechanical gong and electric signal
Easy Testing
- Periodic checks with the test valve
Construction and Design Features
- Clapper-type alarm valve body
- Retard chamber on the alarm line
- Water motor gong and pressure switch
- Gauge, test and drain connections
Send the number of sprinkler zones, pipe size and required approval; we will prepare the wet alarm station material list with you.
How to Choose?
- Check the ambient temperatureA wet system suits areas with no freezing risk.
- Set the main pipe sizeThe station size follows the main supply line.
- Choose the alarm methodPlan a gong, a pressure switch or both.
- Clarify approvalsState the UL, FM or VdS certificate required by the project.
Complementary Products
Why ORFA?
Other Water Fire Suppression Systems
Flow Switch
Flow switches send a signal to the alarm panel when water starts flowing in the sprinkler line, indicating a fire.
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Flow Meters
Flow meters measure the flow delivered by the fire pump on pump test lines.
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Pressure Relief Valve
Pressure relief valves protect the installation by discharging excess water when overpressure occurs in fire pump systems.
Details →Deluge Alarm System and Equipment
Deluge alarm systems supply water simultaneously to open sprinkler or nozzle lines upon a detection signal.
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Fire Department Suction Connection
Fire department suction connections are connection points that allow fire trucks to draw water from a reservoir or installation.
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Fire Department Inlet Connection
Fire department inlet connections allow fire trucks to pump water into the building fire installation from outside.
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Butterfly Valve with Limit Switch
Butterfly valves with limit switch report the valve position to the alarm panel in fire protection lines.
Details →Dry Alarm Valve System and Equipment
Dry alarm valve systems are valves and equipment controlling sprinkler lines filled with pressurized air in areas at risk of freezing.
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NRS Non-Rising Stem Valve
NRS non-rising stem valves are fire line gate valves whose stem does not rise, suitable for limited spaces.
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NRS Valve Supervisory Switch
NRS valve supervisory switches report the open or closed position of non-rising stem valves to the fire alarm panel.
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OS&Y Rising Stem Valve
OS&Y rising stem valves are fire line gate valves whose open or closed position can be seen from the stem.
Details →OS&Y Valve Supervisory Switch
OS&Y valve supervisory switches detect the position of rising stem valves and report it to the fire alarm panel.
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Preaction Systems
Preaction systems release water into the piping only after a detection signal, used where accidental discharge must be avoided.
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Post Indicator
Post indicators allow underground fire line valves to be operated from above ground and show their position.
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Test and Drain Valve
Test and drain valves allow flow testing and draining of sprinkler lines.
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Waste Cone
Waste cones direct water from test and drain lines to the drain in a visible way.
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Fire Check Valve
Fire check valves are approved check valves that prevent backflow in fire protection installations.
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Fire Hose Cabinets
Fire hose cabinets house the hose, nozzle and valve together and are used for first response in buildings.
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Fire Systems Pressure Reducing Valve
Fire systems pressure reducing valves lower excess pressure on lower floors of high-rise buildings to a suitable value for fire equipment.
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Fire Sprinklers
Fire sprinklers open when the ambient temperature rises and automatically spray water onto the fire area.
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Fire Valves
Fire valves are approved valves used to open and shut off lines in fire protection installations.
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Above Ground Fire Hydrants
Above ground fire hydrants are outdoor hydrants that allow fire crews to draw water from the mains.
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Grooved Pipe Fittings
Grooved pipe fittings allow fast assembly with couplings, without welding or threading, in fire and general installations.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.