[Opper77]

good point k-20....the best setup for shielding gas metering is a flowmeter, which reads is cubic feet/min, or litres/min. Some cheaper setups do come with a simple pressure regulator though, which simply steps down tank pressure to working pressure (similar to a regulator on an oxy/acetylene setup)

While good results are possible with the regulator, the flowmeter IS the way to go.