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diving regulator
A diving regulator is a pressure regulator used in scuba or surface supplied diving equipment that reduces pressurized breathing gas to ambient pressure and delivers it to the diver. The gas may be air or one of a variety of specially blended breathing gases. The gas may be supplied from a cylinder worn by the diver (as in a scuba set) or via a hose from a compressor or a bank of cylinders on the surface (as in surface-supplied diving). A gas pressure regulator has one or more valves in series which reduce pressure from the source, and use the downstream pressure as feedback to control the delivered pressure, lowering the pressure at each stage.〔''NOAA Diving Manual, 4th Edition'' CD-ROM prepared and distributed by the National Technical Information Service (NTIS)in partnership with NOAA and Best Publishing Company〕
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, the demand valve is the second stage, which is typically held in the diver's mouth by a mouthpiece. In twin hose regulators the demand valve is included in the body of the regulator attached to the cylinder.
For the history of the diving regulator, see Timeline of diving technology and Scuba set.
==Types of diving regulator==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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