Gas Pressure Reducing Regulators
Gas pressure regulators are fittings that connect directly to the cylinder valve and reduce the high gas pressure in the cylinder to the low, constant working pressure required by the torch or machine in welding, cutting and shielding gas applications. Inlet connection, pressure range and colour code differ for each gas, so a regulator is used only on its own gas.
Body and bonnet are brass; there is a stainless steel filter at the inlet and a relief valve against overpressure on the outlet side. The acetylene type has an inlet pressure of 0–25 bar and outlet of 0–1.5 bar; the helium type has an inlet of 0–230 bar and outlet of 0–10 bar. The regulators are made to EN ISO 2503; “S” types have a shut-off valve added at the outlet.
Main Applications
- Oxy-acetylene welding, cutting and brazing
- Shielding gas supply in TIG and MIG/MAG welding
- Assist gas supply in laser cutting
- Heating and annealing torches
- Workshop and site gas cylinder stations
Technical Data
| Standard | EN ISO 2503 |
|---|---|
| Acetylene – inlet pressure | 0–25 bar |
| Acetylene – outlet pressure | 0–1.5 bar |
| Acetylene – flow | 35 m³/h |
| Acetylene – connections | Inlet W23 × 1/18″ left-hand · outlet G 3/8″ left-hand |
| Helium – inlet pressure | 0–230 bar |
| Helium – outlet pressure | 0–10 bar |
| Helium – connections | Inlet W21.8 × 1/14″ · outlet G 3/8″ |
| Body / bonnet | Brass |
| Filter | Stainless steel, inlet side |
| Safety | Relief valve |
| Option | “S” type: with shut-off valve · “V” type: open/close valve for short stops |
Material Options
| Part | Acetylene · 25 bar inlet | Helium · 230 bar inlet |
|---|---|---|
| Body | Brass | Brass |
| Bonnet | Brass | Brass |
| Inlet filter | Stainless steel | Stainless steel |
| Inlet connection | W23 × 1/18″ left-hand | W21.8 × 1/14″ |
| Outlet connection | G 3/8″ left-hand | G 3/8″ |
| Pressure gauges | Depending on model | Depending on model |
| Diaphragm and seals | Depending on model | Depending on model |
Gas compatibility: An acetylene regulator must not be used on an oxygen or shielding gas cylinder, nor a helium regulator on a flammable gas cylinder; colour code and inlet thread differ to prevent this mix-up. Left-hand threads are used on acetylene lines. When choosing suitable sealing tapes for hose connections, take the gas type into account.
Advantages
Designed per Gas
- Separate pressure range and connection for each gas.
- Lower risk of fitting the wrong cylinder.
Stainless Filter
- Stainless steel filter on the inlet side.
- Particles from the cylinder do not reach the seat.
Relief Protection
- Relief valve at the outlet.
- Hose and torch protected against overpressure.
Shut-Off Option
- Outlet shut-off valve on “S” types.
- Gas is cut without touching the cylinder valve.
Standards Compliant
- Made to EN ISO 2503.
- Compatible with welding and cutting equipment.
Construction and Design Features
- Brass body and bonnet
- Extended gas inlet stem and stainless inlet filter
- Outlet pressure set by the adjusting knob
- Colour-coded design indicating the gas
- Protected gauge arrangement
Send the gas type, cylinder connection and required outlet pressure and flow through the Request a Quote form; we will prepare the right regulator together with connection and hose equipment.
How to Choose?
- Identify the gasChoose the regulator according to the gas used (acetylene, helium, argon etc.).
- Check inlet pressureMake sure cylinder pressure does not exceed the regulator inlet limit.
- Choose the outlet rangeSelect the range covering the working pressure required by the torch or machine.
- Match the connectionsCheck the compatibility of cylinder valve and hose threads (left / right).
- Commission safelyOpen the cylinder valve slowly with the adjusting knob released, then set the outlet.
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Details →Our Gas Pressure Reducing Regulators
ORFA supplies gas pressure reducing regulators 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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