Fixed-Set Safety Valves
A fixed-set safety valve is a compact brass valve set at the factory to a specific value that cannot be changed on site, opening at that pressure to relieve excess pressure.
It is used on combi boilers, calorifiers, solar, booster and expansion tank circuits. The product range includes 1/2″–1″ models with fixed set values from 2.5 to 10 bar and male or female inlets.
Main Applications
- Combi and wall-hung boilers
- Calorifiers and water heaters
- Solar circuits
- Booster and expansion tanks
- Closed heating circuits
Technical Data
| Type | Fixed-set safety valve |
|---|---|
| Set values | 2.5 / 3 / 4 / 6 / 8 bar … (product range) |
| Sizes | 1/2″, 3/4″, 1″ (product range) |
| Connection | Male or female inlet (product range) |
| Body | Brass |
| Setting | Fixed at the factory; not changed on site |
| Temperature | Depending on model |
| Fluid | Water (depending on model) |
Material Options
| Part | Fixed set | Adjustable |
|---|---|---|
| Setting | Fixed at the factory | Adjustable on site |
| Safety | No wrong-setting risk | Authorised setting and seal needed |
| Size | 1/2″ – 1″ | 1/2″ – 3″ |
| Typical use | Combi boilers, calorifiers, tanks | Boilers, booster sets |
Which material? On a fixed-set valve the set value should be equal to or below the protected device’s maximum pressure; the set value is marked on the valve. The temperature limit is confirmed per model.
Advantages
Safe
- Factory setting cannot change
Compact
- On top of the device
Wide Set Choice
- From 2.5 to 10 bar
Easy Installation
- Threaded connection
Construction and Design Features
- Brass body
- Fixed-set spring
- Disc and seal
- Test cap (depending on model)
Send the set pressure, size and inlet type; we will confirm a suitable fixed-set safety valve from stock.
How to Choose?
- Size and inletChoose thread size and male or female inlet.
- Set pressureSet it by the device’s maximum pressure.
- FluidConfirm water and temperature.
- CapacityChoose a size for heater output.
Complementary Products
Why ORFA?
Other Threaded Safety Valves
Flame Arresters
Flame arresters stop flashback on flammable gas lines and protect the line and equipment.
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Bronze Safety Valves
Bronze safety valves have a bronze body and threaded ends and open to protect the system when the set pressure is exceeded.
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Compressor Safety Valves
Compressor safety valves release excess pressure in air compressors and receivers to protect the equipment.
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Stainless Steel Safety Valves
Stainless steel safety valves have a stainless steel body and threaded ends and protect against overpressure.
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Brass Safety Valves
Brass safety valves have a brass body and threaded ends and protect heating and water systems against overpressure.
Details →
Water Heater Safety Valves
Water heater safety valves release excess pressure in water heaters and boilers to protect the appliance.
Details →Our Fixed-Set Safety Valves
ORFA supplies fixed-set safety valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
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