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Inspect external condition and test function before use. (specifically test the seal of exhaust valves and possible leaks in the second stage casing and mouthpiece before opening the cylinder valve). [24] Use equipment only if it is in good working condition. [5] Use of alternative air source if DV breathes wet during dive.
A slow leak of the first stage valve known as intermediate pressure creep can cause the interstage pressure to rise until either the next breath is drawn, or the pressure exerts more force on the second stage valve than can be resisted by the spring, and the valve opens briefly, often with a popping sound, to relieve the pressure. the frequency ...
An out-of-gas emergency occurs when the breathing gas supply is cut off by running out, supply system failure, or supply system interruption. These are the most urgent of the common diving emergencies, and the ones the diver should be equipped and skilled to manage.
Exhaust ducting on scuba demand valve. The exhaust manifold (exhaust tee, exhaust cover, whiskers) is the ducting that protects the exhaust valve(s) and diverts the exhaled air to the sides so that it does not bubble up in the diver's face and obscure the view. This is not necessary for twin hose regulators as they exhaust air behind the shoulders.
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This permits the maximum flow of air through the engine, flushing the overly rich fuel mixture out of the exhaust. If the exhaust system is hot enough to autoignite, an after-fire may result; this can be seen as a flame discharging through the exhaust system. On a fuel-injected engine, ignoring the throttle (no fuel) while starting permits ...
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In this case it is usual to remove the DV from the mouth, flood it to rinse, and clear using the purge button. The process may be repeated as necessary. If the DV breathes wet after purging, something may be stuck in the exhaust valve. Flooding the DV and clearing again with the mouthpiece blocked usually clears the exhaust valve. [23]