Pressure Relief Valve
A pressure relief valve opens and discharges excess water when line pressure exceeds the set value while the fire pump runs at low flow. This protects valves, pipes and sprinklers from the pump’s shut-off pressure.
The store range includes DN80, DN100, DN150 and DN200. It is used especially at diesel fire pump outlets to limit the pressure rise that comes with engine overspeed.
Main Applications
- Diesel fire pump outlets
- Pressure limiting on electric pump systems
- Pump test line returns
- Fire lines with pressure fluctuations
Technical Data
| Function | Overpressure relief |
|---|---|
| Size | DN80, DN100, DN150, DN200 (product range) |
| Connection | Flanged (by model) |
| Opening pressure | Adjustable (range by model) |
| Control | Pilot or spring (by model) |
| Discharge | To a waste cone or tank (by design) |
| Material | By model |
| Pressure class | By model |
Material Options
| Part | Relief valve |
|---|---|
| Body | By model |
| Internals | By model |
| Diaphragm / spring | By model |
| Connection | Flanged (by model) |
Which material? The manufacturer datasheet of this relief valve could not be obtained; sizes are taken from store products. The opening pressure is set by the pump curve and system design, and material and class are confirmed by model.
Advantages
Equipment Protection
- Line protected against overpressure
Adjustable
- Opening pressure set to the system
Suits Diesel Pumps
- Limits pressure on overspeed
Large Sizes
- Up to DN200
Construction and Design Features
- Closing element that opens at the set pressure
- Adjusting screw or pilot control
- Flanged inlet and discharge
- Connection to the discharge line
Send the pump flow, shut-off pressure and line size; we will define the right relief valve and set range with you.
How to Choose?
- Collect pump dataTake flow and shut-off pressure from the pump curve.
- Select the sizePick the DN size suited to the relief flow.
- Set the opening valueChoose an opening pressure above the system design pressure.
- Plan the dischargeRoute the outlet to a waste cone or tank.
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Why ORFA?
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