Flow Switch
A flow switch is an electric switch that detects water flow in the line through a flexible vane reaching into the pipe through a drilled hole. When a sprinkler opens and water starts to flow, the vane bends with the flow and, after an adjustable delay, the switch sends an alarm to the fire panel.
The store range covers 2″, 2½” (76.1 mm), 3″, 4″, 5″, 6″ (165.1 / 168.3 mm) and 8″ pipe sizes. It is used at the inlet of each sprinkler zone, at floor control stations and on alarm valve outlets to tell the panel where the fire is.
Main Applications
- Sprinkler zone and floor inlets
- Floor control stations
- Alarm valve outlet lines
- Flow monitoring on hose cabinet supply lines
Technical Data
| Detection | Vane reaching into the pipe |
|---|---|
| Pipe size | 2″, 2½” (76.1 mm), 3″, 4″, 5″, 6″ (165.1 / 168.3 mm), 8″ (product range) |
| Mounting | Saddle body over a drilled hole |
| Delay | Adjustable (range by model) |
| Output | Dry contact (type by model) |
| Orientation | Horizontal or vertical flow-up line (by model) |
| Protection class | By model |
| Approval | UL / FM certificate by model |
Material Options
| Part | Flow switch |
|---|---|
| Housing | By model |
| Vane | Flexible, sized to pipe |
| Saddle and U-bolt | By model |
| Contact | By model |
Which material? The vane length is chosen by the pipe inside diameter; a wrong-size vane may rub the pipe or detect flow late. The delay is set to prevent false alarms from pressure surges.
Advantages
Zone Information
- Panel shows where the fire is
Against False Alarms
- Adjustable delay
Easy Installation
- Saddle mounted over a drilled hole
Wide Sizes
- From 2″ to 8″
Construction and Design Features
- Saddle body and U-bolt seated on the pipe
- Flexible vane reaching into the pipe
- Delay mechanism
- Contact block and cable entry
Write the zone pipe size and panel input type; we will confirm the right flow switch with stock details.
How to Choose?
- Set the pipe sizeWrite the pipe size and OD at the zone inlet.
- Pick the locationLeave enough straight pipe from valves and elbows.
- Adjust the delayChoose a delay that rides through pressure surges.
- Run the testFlow water through the test and drain valve and verify the panel signal.
Complementary Products
Why ORFA?
Other Water Fire Suppression Systems
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Details →Get a quote for your project
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