![]() In these cases the freeflow can usually be eliminated by adjusting the setting. ![]() In demand valves where the cracking pressure is adjustable by the diver, it may also occur as a result of maladjustment of the cracking pressure ("dial a breath") knob. As long as the freeflow continues, the refrigerating effect of the air expanding through the valves will keep the ice frozen, and air will continue to escape until either the cylinder valve is closed, or the cylinder is empty. ![]() If the freeflow is caused by freezing it will generally not be corrected except by closing the cylinder valve and allowing the ice to thaw, which requires an alternative air supply to breathe from while the valve is closed. This may be caused by very cold water freezing the first or second stage valve open, or a malfunction of either the first or second stages. Sometimes the freeflow will not stop when the backpressure is increased. If the freeflow is caused by a "venturi effect", simply closing the mouthpiece over will stop it immediately. In scuba diving, a freeflow occurs when the diving regulator continues to supply air instead of cutting off the supply when the diver stops inhaling, or starts to flow when out of the diver's mouth due to a pressure difference over the diaphragm or a bump to the purge button, and continues to flow due to the "venturi effect" of reduced internal pressure caused by high flow velocity of the escaping air. See also: Mechanism of diving regulators ยง Malfunctions and failure modes
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