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RE: [APD] Re: Help! (Flowgauge Regulator)



I am using one of these regulators as well.  There is a piece that I removed
that has a tiny hole in it.  I then put in an adapter do I could connect my
needle valve.  Then I turn the regulator up to about 25 to get a stable flow
through the needle valve and adjust the needle valve to give me the output I
need.  I don't particularly rely on the gauges themselves other than to give
me some ballpark ideas on where the knobs all need to be.  I just monitor
the bubble rate and pH levels to know where everything sits.

Now if I remember correctly, looking on the low pressure gauge there is
something that says Argon use .05 opening or something like that.  That
seems to me to be the piece that I removed.  I don't know much about
regulators but is it possible that by removing that piece that you are
converting it from a flow gauge to a pressure gauge?

-----Original Message-----
From: Rick Beatty [mailto:rjb1211 at comcast_net] 
Sent: Sunday, December 28, 2003 11:13 AM
To: d_guynn at sbcglobal.net; aquatic plants digest
Subject: Re: [APD] Re: Help! (Flowgauge Regulator)

Douglas -

I used to work in the fluid power industry so I suspected as much.  The
regulator doesn't state what the maximum outlet pressure is.  Do you see any
problem with replacing the flow gauge with a pressure gauge to see what
reading I get with downstream blocked?  Others have stated that some of
these units give mixed results.  Could this be why - it is a flow control
device and not really a pressure regulator?

rb


----- Original Message -----
From: Douglas Guynn <d_guynn at sbcglobal.net>
To: Aquatic_Plant_Mailing_List <aquatic-plants at actwin_com>
Sent: Saturday, December 27, 2003 9:34 PM
Subject: [APD] Re: Help! (Flowgauge Regulator)


> Rick wrote:
> "Does anyone know what the difference is between this and a standard 
> regulator and, more importantly, if it matters?  If the recommendation 
> is
to
> set the pressure to 10 to 20 PSI, how would that equate to CFH?"
>
> A standard pressure regulator will allow enough fluid (in our case 
> gaseous
> CO2) to pass through to maintain a specific outlet pressure, 
> irrespective
of
> flow (within the operating parameters of the regulator). In this 
> application, you open the downstream needle valve, the regulator will 
> open enough to maintain the tubing between the regulator and the 
> needle valve
at
> the chosen pressure. Some of these are adjustable, some are preset.
>
> I believe the "regulator" you purchased is actually a flow control 
> device, not a pressure control device. It will allow enough fluid 
> (again, CO2) to pass through to maintain a specific flow, irrespective 
> of pressure (again, within the operating parameters of the regulator). 
> Of course, this depends upon whether or not the downstream equipment 
> will accept the set flow
rate.
> If not, the pressure will continue to rise to whatever the maximum 
> outlet pressure of the "regulator" is.
>
> You cannot convert psi to cfm, unless the system is stable. For 
> instance;
if
> the orifice size does not change, and the inlet and outlet pressures 
> do
not
> change, and the composition of the fluid does not change, and the 
> temperature of the system does not change, the flow will remain constant.
If
> any one of the variables change, it will affect the flow rate. If two 
> of
the
> variables change, the flow may or may not change, depending which 
> variable changes and whether it increases or decreases.
>
> While pressure and flow are related (flow is, after all volume per 
> unit time), to compare them is like comparing oranges to apples. They 
> are both fruit (related), but definitely nowhere near the same
(interchangeable).
>
>
> Douglas Guynn
> 432.368.5411
> d_guynn at sbcglobal.net
>
> "The power to do things for you is the power to do things to you." -
Dorothy
> Parker
>
>


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