Hmmm, I think it's normal for it to be non instant because what's happening is the valve is shut upstream of the needle valve, but there is still residual pressurized CO2 downstream and so however long it takes to reach equilibrium is how long it will take to stop bubbling .. a few minutes does seem sort of long though.. What's your outlet pressure set at? I run mine around 18psi, I found anything less I just couldn't really get a consistent bubble rate (I have a Milwaulkee brand regulator which is reputed to be not really one of the best, so that could be a part of it for me).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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