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Depths of 40 metres (130 ft) require up to 9 bars (130 psi). The pressure relief valve will blow off excess air delivered at low demand, to protect the system from overpressure loads, while delivering sufficient air for higher exertion. [30] The air line hose should be rated for breathing air, with a bore of 8 to 10 millimetres (0.31 to 0.39 in).
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.
Watts logo. Watts Water Technologies, Inc. is a company based in the United States that makes valve products for plumbing and heating, such as water pressure regulators and other valves. [1] Watts is one of the largest manufacturers of water valves in the United States. The company was founded by Joseph Watts. [2] It employs about 4,500 ...
In upstream valve regulators or regulators with an isolation valve at the second stage, such as the bailout valve on a surface supplied helmet or full-face mask, this relief valve function of the second stage may not be available, and a pressure relief valve on the first stage is necessary to prevent the pressure in the hose rising until it ...
In the case of the downstream check valve passing, the differential pressure relief valve prevents the possibility of the chamber pressure from exceeding the supply pressure. It is theoretically possible that, when both valves are faulty, backflow could occur, should the reverse flow rate exceed the capacity of the relief valve.
In the UK, the British Standards Institution sets the standards. Included among the standards is the use left-hand threaded valves for flammable gas cylinders (most commonly brass, BS4, valves for non-corrosive cylinder contents or stainless steel, BS15, valves for corrosive contents).