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Page 1 of 20 A diving regulator is a pressure regulator used in a scuba set that supplies the diver with breathing gas at ambient pressure from one or more diving cylinders. The gas may be air or one of a variety of specially blended breathing gases. A gas pressure regulator has one or more valves in series, which let the gas out of a gas cylinder in a controlled way, lowering air pressure at each stage. The terms "regulator" and "demand valve" are often used interchangeably, but a demand valve is the part of a regulator that delivers gas to the diver's mouth. For the history of the diving regulator, see Timeline of underwater technology.
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