Diving Dictionary

Diving Dictionary

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Free Flow

Definition

Free flow is a malfunction where a regulator continuously releases air, either due to freezing, mechanical failure, or improper handling.

More on Free Flow

Free flow occurs when the second stage valve sticks open or is triggered by extreme cold, debris, or pressure imbalance. A free-flowing regulator dumps air uncontrollably, which can deplete a tank rapidly if not corrected. In cold water, it’s often caused by freezing moisture in the second stage or over-breathing. Divers are trained to manage free flows by switching to a backup, ascending calmly, or breathing from the flowing second stage in emergencies.

Frequently Asked Questions

Common causes include freezing in cold water, damaged components, debris, or pressing the purge button while submerged face-up.
Tilt the second stage downward to reduce pressure, switch to an alternate, or abort the dive if the situation can't be stabilized.
Yes, in emergencies. Cup the diaphragm and sip air while ascending. But it wastes gas rapidly, so act quickly.
Use sealed, cold-water-rated regulators and avoid rapid inhalation or purge button use at the surface.
No. The regulator should be inspected and serviced before diving again.

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