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In open circuit free-flow systems, the air is supplied at an approximately constant rate, and the diver uses only a relatively small part of the passing gas. The original Aqua-Lung regulator was a single stage unit, packaged in a circular brass housing mounted on the cylinder valve behind the diver's neck.
Draeger twin hose two stage demand regulator. The most striking and well recognized example of vintage scuba gear is the twin-hose or double hose regulator, a popular style of regulator in the early years of scuba diving, since Jacques-Yves Cousteau and Emile Gagnan pioneered the first such design, the C45 Scaphandre Autonome, which was marketed in the USA (along with a tank and harness) as ...
A gas duster, also known as tinned wind, compressed air, or canned air, is a product used for cleaning or dusting electronic equipment and other sensitive devices that cannot be cleaned using water. This type of product is most often packaged as a can that, when a trigger is pressed, blasts a stream of compressed gas through a nozzle at the top.
A pair of demand valves fitted to a scuba regulator Navy surface supplied diver with back mount bailout cylinder Solo scuba diver with sling mount bailout cylinder. In underwater diving, an alternative air source, or more generally alternative breathing gas source, is a secondary supply of air or other breathing gas for use by the diver in an emergency.
Air from the diving cylinder is subjected to a dramatic reduction in pressure - as much as 220 bar (3,200 psi) from a full 230 bar (3,300 psi) , and 290 bar (4,200 psi) from a full 300 bar (4,400 psi) cylinder at the surface - when passing through the regulator first stage.
A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.
Oxygen and fuel gas regulators usually have two stages: The first stage of the regulator releases the gas at a constant pressure from the cylinder despite the pressure in the cylinder becoming less as the gas is released. The second stage of the regulator controls the pressure reduction from the intermediate pressure to low pressure.
The term cylinder in this context is sometimes confused with tank, the latter being an open-top or vented container that stores liquids under gravity, though the term scuba tank is commonly used to refer to a compressed gas cylinder used for breathing gas supply to an underwater breathing apparatus.
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