"Rex Grigg" Bubble Counter & Fabco valve - Panel mounted w/simple vernier mod

[pat w]

Nothing to do -- Waiting for my plants -- bored out of my skull so I did this ...



That's a Rex Grigg's bubble counter with the Fabco Needle valve. I did a quick vernier design in AutoCad that gives 100 repeatable divisions per turn and now I have 900 repeatable steps for a 9 turn valve. This way when I find a regulator pressure and needle valve setting that works, I can still experiment and get back close to the staring point with a minimum of trial and error.

Pat

[S&KGray]

Nice job! It looks good.

[pat w]

Thanks,

Here's the print of the scales, for anyone who's interested. It's in .pdf format so the scale my be off. Let me know if it is and I'll see what I can do to correct it.

Fabco 55-NV Vernier.pdf

I made four of each, which was good, because I messed up three of one and two of the other trying to get the center hole 'centered'.

Also, I was warned by the guy at Office Depot to cut them out before laminating them or they'll peel too easily.

Pat

[Biollante]

Hi Pat,

That is a nice job!

I am an Ideal 52-1-12 Needle Valve kind of evil plant monster. I am not so sure about the precision of the Fabco Needle valve. Then again, I tend to trust Rex.

The trick with needle valves and such is the precision of the machining and the materials used.

Biollante

[pat w]

Yeah, it was the middle pick on his site between the Clippard (widely regarded as inadequate) and the Ideal (personally regarded as more than I could afford).

Anyway, it came bundled with the bubble counter and two check valves for a decent price. I'll just have to wait and see if it meets the need.

Later,
Pat

[Biollante]

Yeah, it was the middle pick on his site between the Clippard (widely regarded as inadequate) and the Ideal (personally regarded as more than I could afford).

Anyway, it came bundled with the bubble counter and two check valves for a decent price. I'll just have to wait and see if it meets the need.

Later,
Pat

Hi Pat,

I am quite sure with a little fiddling it will serve you well.

I did not mean that in a snarky sort of way.

Biollante

[Wet]

Very cool. Just curious -- making one for your regulator, too?

You know, if you have the capability of making a grip of those dials you could probably easily trade them with hobbyists for plus plants and fill up that 90 gallon from the start.

* Biollante - I am an inline Fabco NU-55 needle valve kind of plant monster. I have an evil Clippard still connected at the regulator run open, too (laziness). Fabco is nice and feels well built (heavy, has a nice movement). I have not tank dumped with it in line yet. If it ever drifts I can't tell. I am the kind of plant monster who adjusts CO2 pretty regularly (at least every month?) because I am OCD like that, so I agree pat w's idea is very useful. I have never tried another needle valve (besides the Clippard). The Ideal 52-1-12 does look very nice.

A stepped valve could be cool? As in not these smooth turns but, say, 40 increments/clicks around.

[pat w]

Bio,

No snarkiness taken, I was just lamenting my lack of funds.

Did you get a look at my tank progress thus far? You've helped me out so much, I was just wondering what you thought about my 'river channel' solution.

The thread is Here

* Wet - No plans on the regulator. I got pointed to a Victor 450D on Ebay by LeftC and replaced the output guage with a 0-60 psi I bought from McMaster-Carr. I'm going to close it down, then open up the Fabco all the way. I'll then open the Victor up slowly until I get some acceptable upper range bubble count (6,7,8? per sec) and note the reading on the guage for my 'calibration point'.

Listen, if you really think anyone would trade plants for the mod, I'm game to try. I just don't know how to get the ball rolling.

Pat

[Biollante]

Very cool. Just curious -- making one for your regulator, too?

* Biollante - I am an inline Fabco NU-55 needle valve kind of plant monster. I have an evil Clippard still connected at the regulator run open, too (laziness). Fabco is nice and feels well built (heavy, has a nice movement). I have not tank dumped with it in line yet. If it ever drifts I can't tell. I am the kind of plant monster who adjusts CO2 pretty regularly (at least every month?) because I am OCD like that, so I agree pat w's idea is very useful. I have never tried another needle valve (besides the Clippard). The Ideal 52-1-12 does look very nice.

A stepped valve could be cool? As in not these smooth turns but, say, 40 increments/clicks around.

Hi,

As I said if Rex Griggs recommends the Fabco NU-55 needle valve as a good alternative, I have no reason to doubt that it would be an excellent choice.



I operated for decades with inexpensive ( avoiding the pejorative) needle valves, some worked remarkably well. Most took a lot of messing about, which I really did not mind. I know folks who are happy with the Clippard or even Milwaukee.


I am also a believer that a hobby should not be a cause for more stress, it is after all a hobby, not…well, er… Golf. That includes not going into debt for a hobby, I do not want to tell anyone how to run their financial life, however if they asked, that is what I would counsel.

If you were adjusting your CO2 to try another flow rate, no problem, if you are adjusting the flow to maintain a level, then I would see that as a deficiency in the needle valve (likely) or the system. As with my watch, I could afford a better watch, but I like the one I wear, though I have to set the time a couple of times a month.

I am going avoid out running my knowledge and stick with my experience, I will defer to experts on the issue of stepped valves to control the flow, as well as the differences between mass and volumetric flow.

Having said that I believe there is a reason we use infinitely adjustable volume control valves versus step valves. My experience is that even with expensive lab grade needle valves, getting the flow back to an earlier setting is difficult. Then I may just be incompetent.

I do not think that for most hobby needs it makes any difference.


My general advice to people matches Tom Barr’s, for whatever reason it often upsets folks when I suggest observation is all you need.

You do not need expensive equipment to grow wonderful plants along with awful weeds. I am more and more coming to the view most may not even need pressurized CO2.

Biollante

[Biollante]

Bio,

No snarkiness taken, I was just lamenting my lack of funds.

Did you get a look at my tank progress thus far? You've helped me out so much, I was just wondering what you thought about my 'river channel' solution.

The thread is Here
Pat

Hi Pat,

I like the river channel; I like the use of vinyl. I have done some similar things using acrylic sheets and a heat gun. Yours looks smoother I suspect you may find the channel may be somewhat shallow.

Keeping with your “Lost City” theme, you may wish to add some contrasting stone and if you are a little playful, dare I suggest some blue enamel gravel down the riverbed.

I might also suggest a cork background Tom Barr has a great riff on it around here.

I think it is going to be a gorgeous tank.

Biollante