Threaded Safety Valves

Bronze Safety Valves

A bronze safety valve is a threaded cast bronze safety valve that opens against spring force at the set pressure, relieving excess pressure on steam, gas or liquid lines.

It is used on steam boilers, compressor receivers, calorifiers and pressurised water circuits. The product range includes 1/2″ to 2″ models with 2.1–10.5 bar and 10.5–20 bar setting ranges.

1/2″ – 2″size (product range)

2.1 – 20 barsetting range (by spring)

PN25max. working pressure

−20 … +185 °Ctemperature (by material)

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Main Applications

Steam boilers
Compressor and air receivers
Calorifiers and hot water tanks
Pressurised water circuits
Gas lines (depending on model)
Process vessels

Technical Data

Connection	Male inlet, female outlet; same nominal size
Sizes	1/2″, 3/4″, 1″, 1¼”, 1½”, 2″
Setting ranges	2.1–10.5 bar · 10.5–20 bar (by spring)
Max. working pressure	PN25
Temperature	−20 / +185 °C (per material table)
Seat diameter	13 mm (1/2″) … 50 mm (2″)
Relief, 11–20 bar, gas/steam	1/2″: 112–195 kg/h · 2″: 1,650–2,891 kg/h
Relief, 11–20 bar, water	1/2″: 1,638–2,208 kg/h · 2″: 24,240–32,640 kg/h
Reseat	Up to 10% below set for gases, 20% for liquids
Height / weight	145 mm, 0.52 kg (1/2″) … 283 mm, 2.0 kg (2″)

Material Options

Part	PN25 · bronze body
Body	Cast bronze
Seat	Forged brass
Disc	Forged brass
Soft seal	PTFE
Stem	Brass

Which material? A safety valve is set by the maximum allowable pressure of the protected equipment, and its relief capacity must meet the boiler or compressor capacity. Values come from the threaded safety valve manufacturer sheet.

Advantages

Bronze Body

Resists steam and water

Two Setting Ranges

2.1–10.5 and 10.5–20 bar

High Relief

Capacity table

Lever Test

Manual lifting

Construction and Design Features

Cast bronze body
Spring and adjusting screw
PTFE soft-seated disc
Lifting lever

Send the size, set pressure, fluid and required relief capacity; we will confirm a suitable bronze safety valve from stock.

How to Choose?

Size and connectionDetermine the inlet thread size.
Set pressureChoose the setting by the equipment maximum pressure.
Fluid and capacityCheck relief capacity for steam, gas or water.
MaterialChoose bronze or stainless body.

Complementary Products

Pressure Gauges Steam Separators Thermodynamic Steam Traps Boiler Surface and Bottom Blowdown Systems Expansion Tanks Pressure Measurement and Control Equipment

Why ORFA?

Since 1985Over 40 years of experience in supplying industrial piping equipment.

Technical ConsultancyTechnical support on safety valve setting and capacity.

Delivery from StockBronze safety valves 1/2″ – 2″ are shipped from stock.

Compatibility CheckPressure Gauges for pressure monitoring from the same point.

In This Group

Other Threaded Safety Valves

Flame Arresters

Flame arresters stop flashback on flammable gas lines and protect the line and equipment.

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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 →

Fixed-Set Safety Valves

Fixed-set safety valves open at a pressure set in the factory that cannot be changed.

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Water Heater Safety Valves

Water heater safety valves release excess pressure in water heaters and boilers to protect the appliance.

Details →

Our Products

Our Bronze Safety Valves

ORFA supplies bronze 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.