Dry Alarm Valve System and Equipment
A dry alarm valve system is the control station of installations where sprinkler pipes are kept filled with pressurised air or nitrogen instead of water. When a sprinkler opens, the air pressure in the pipe drops, the dry pipe valve opens and water fills the line to reach the sprinklers.
The system consists of a dry pipe alarm valve, air compressor or nitrogen supply, air pressure trim, accelerator, alarm switches and drain components. It is used in unheated car parks, cold stores, loading docks and open structures against freezing.
Main Applications
- Unheated enclosed car parks
- Cold storage warehouses
- Loading docks and canopies
- Attics and open structures
- Industrial areas exposed to winter frost
Technical Data
| System type | Dry pipe sprinkler control station |
|---|---|
| Main element | Dry pipe alarm valve |
| Pipe content | Pressurised air or nitrogen |
| Air supply | Compressor or nitrogen unit |
| Opening acceleration | Accelerator (by model) |
| Alarm | Pressure switch and alarm gong |
| Maintenance | Main drain and low-point drains |
| Size and connection | By model (please ask) |
| Approval | UL / FM / VdS certificate by model |
Material Options
| Part | Function |
|---|---|
| Dry pipe valve | Opens when air pressure falls and releases water |
| Compressor / nitrogen | Maintains gas pressure in the pipe |
| Accelerator | Senses the pressure drop and speeds valve opening |
| Pressure switches | Give low-air and water-flow alarms |
| Drain valves | Empty the line after testing |
Which material? In a dry system there is a short delay before water reaches the sprinklers, so line volume and the need for an accelerator are calculated in the project. Size and approval certificate are selected per project with you.
Advantages
Freeze Protection
- No water left standing in the pipes
No Heating Needed
- Energy savings in cold areas
Accelerator Option
- Shorter water delivery time
Gas Choice
- Works with air or nitrogen
Construction and Design Features
- Dry pipe valve separating air and water sides
- Air pressure trim and compressor connection
- Accelerator and alarm switches
- Main and low-point drains
Send the temperature of the protected area, line volume and pipe size; we will plan the dry alarm station and air supply together.
How to Choose?
- Assess freezing riskChoose a dry system if the area drops below zero.
- Calculate line volumeVolume decides whether an accelerator is needed.
- Select the air supplyPlan a compressor or nitrogen unit.
- Place the drainsFit drains at the low points of the line.
Complementary Products
Why ORFA?
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Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.