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Hi Pierre,
Freeflows can happen from first and/or second stages.
We've all seen second stages freeflow - when people first get in the water and their reg bubbles away until they turn it over or lift it out of the water. They can also go off if theres a bit of crap or ice in the workings.
Second stage flows are more tricky.
Usually due to icing but sometimes can be component failiure/maintenence related.
If the first stage freezes, usually due to water temp and usage (the quicker the air passes thru the stage,the greater the temp drop), It wont usually stop until you turn the cylinder off. When the first stage is flowing the second cant contain the pressure so is forced to flow - handy really cos it saves your hose.
Sorry if its a bit long winded, i'm still high on dotty!
Stu.
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