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Re: [APD] Solenoids & Needle Valves
Theoretically, one could use a laminar flow restrictor in the CO2 line
from the regulator, then, if the restrictor was properly chosen, one
could set a bubble rate by changing the regulator output pressure.
Back when I was working for a living, I was really fascinated by the
Lee Company's laminar flow restrictors, some of which were virtually
solid plugs. However, I don't know if they still make them or if they
were enough of a restriction to control at bubbles per second of CO2
rates. (I once invented a device using Lee laminar restrictors and
orifice restrictors in a Wheatstone Bridge circuit that would shut off
a valve if a low viscosity fluid, like water, tried to flow thru it.
Since the application I wanted it for wasn't a major one, the
invention, like most of them, ended up in a dead file, but the
prototype worked very well.)
On Wednesday, September 28, 2005, at 10:53 AM, Jerry Baker wrote:
> urville wrote:
>> what about the needle valve. i put that into ebay and got like...
>> pilot light gas valves and i cant tell one form the other they
>> amazingly look alot alike.
> A needle valve is a must-have. You cannot control the CO2 well enough
> with just a regulator. Even some needle valves are too sloppy. I had
> where the difference between 1 bubble/sec. and 10 bubbles/sec. was
> less than 1/8th of a turn.
> Jerry Baker
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
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