Regulators

A diving regulator is a pressure regulator used in a scuba set or surface supplied diving equipment that supplies the diver with breathing gas at ambient pressure from one or more diving cylinders or a surface supply diving compressor or bank of compressed breathing gas 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.[1] The terms “regulator” and “demand valve” are often used interchangeably, but a demand valve is the part of a regulator that delivers gas only while the diver is breathing in and reduces the gas pressure to ambient. In single hose regulators, it is part of the second stage held in the diver’s mouth by a mouthpiece. In double hose regulators it is part of the regulator attached to the cylinder.