Re: [APD] Solenoids & Needle Valves

[Vaughn Hopkins <hoppy1 at surewest_net>]

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.)

Vaughn H.

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 
> one
>   where the difference between 1 bubble/sec. and 10 bubbles/sec. was
> less than 1/8th of a turn.
>
> -- 
> Jerry Baker
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