Gas pressure regulators
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Frequently asked questions
Can one regulator serve oxygen, acetylene and CO2?
No, each gas has its own regulator with different connection threads, materials and pressure range. Oxygen regulators must be entirely free of oil and grease, since oil in contact with high-pressure oxygen can ignite. Acetylene service must avoid pure copper or high-copper alloys in the gas path because of the risk of explosive compounds.
Does a CO2 regulator need a heater?
CO2 cools sharply as it expands through the regulator, which can freeze and block the regulator at high flow. A heated CO2 regulator prevents freezing in continuous MIG/MAG welding. At low flow with intermittent welding, a heater may be unnecessary.
What shielding gas flow rate should be set?
MIG/MAG is typically set at about 12 to 20 L/min and TIG at about 6 to 12 L/min, depending on nozzle size and draughts. Too little flow causes porosity; too much causes turbulence that draws air into the pool and wastes gas. A flowmeter or float tube regulator sets flow more accurately than a pressure gauge.
When is a flashback arrestor required?
In oxy-fuel welding and cutting, a flashback arrestor stops a flame travelling back into the hoses and cylinders. It is usually fitted at the regulator outlet and/or the torch handle. Many occupational safety rules treat it as mandatory equipment.
What do the gauges on a regulator show?
A two-gauge regulator has one gauge for cylinder pressure and one for outlet pressure or flow. For compressed gases such as argon and oxygen, cylinder pressure falls in proportion to remaining gas. For liquid CO2, cylinder pressure stays almost constant until the cylinder is nearly empty, so it must be weighed to know the contents.
How should a cylinder valve be opened safely?
Stand to the side of the regulator, not in front of the gauges, and open the cylinder valve slowly. Before fitting the regulator, crack the cylinder valve briefly to blow dust from the outlet, except fuel gas in enclosed spaces. Back off the adjusting screw fully before opening the cylinder so the diaphragm is not pressure shocked.
How are gas leaks checked at regulators and hoses?
Brush soapy water or a dedicated leak detection fluid onto the connections, where bubbles indicate a leak. Never use a flame to find leaks. Check every time a cylinder is changed or a hose refitted.
When does a regulator need servicing or replacement?
Replace or send the regulator for checking when the gauge needle does not return to zero, outlet pressure keeps rising after setting (creep), or the body leaks. Do not dismantle the diaphragm yourself, especially on oxygen regulators. Many manufacturers recommend periodic inspection every few years.
