Diy regulator build, built around an amazing ebay find. - The Planted Tank Forum
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post #1 of 6 (permalink) Old 04-12-2019, 04:03 AM Thread Starter
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Diy regulator build, built around an amazing ebay find.

I bought a New Airgas Y12-244A320 Two Stage Brass Nickel regulator. It comes with a nickel plated cga-320 installed, and dyer flowmeter.I am not sure of the flowmeter range. The regulator tops out at 25 psi, probably closer to 30. I'm planning on installing a clippard mouse solenoid. If the dwyer is of the appropriate range I will use it, otherwise I will replace it.
My question is this. How much money do I need to spend for a metering valve? I have seen low flow metering valves for ridiculous sums. Can someone give me an idea?
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post #2 of 6 (permalink) Old 04-12-2019, 04:52 AM
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Fabco NV-55-18 is very popular and its not all that expensive

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post #3 of 6 (permalink) Old 04-12-2019, 06:36 AM
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Smc-as100-m5 for about $10
Fabco about $50
High precision Aalborg or Dakota for slightly under $100

As to eek bay ???? See
Only catch is the 002 is not a standard part number
I did know what it meant at one time.
Consider it reference.
Hoke 1300 (1 degree needle is best) or 1600 (any depending on ends) are worth serching for.
There are Parker's and Swagloks as well but numbering gets confusing sort of.
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post #4 of 6 (permalink) Old 04-13-2019, 04:41 PM
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I like the Fabco, both the NV-55 and the NV-55-18 which is the same valve except the -18 is larger to allow using the 1/8 inch solid pipe rather than the much smaller -55 which uses a tiny 10-32 fitting. So which I use depends on how I am running the CO2. At times, having the whole thing mounted at the CO2 tank seems right but other times, I like having as much OFF the tank means I am less prone to breaking the small stuff when changing out tanks for refill. This matters more on larger tanks as the CO2 tank is more awkward. I use Grigg's reactors on large tank and that means very low pressure like 4-6 PSI which is ideal fo using the NV-55 as a smaller, cheaper options that I locate on tubing out and away, usually mounted somewhere on the stand where I can see and adjust it easier than on the CO2 tank itself. If you use the Dwyer, it seems really easy for me to run both inline on tubing. That lets me set the needle valve right beside the meter that I'm watching when adjusting.
For the question of the sizing of the Dwyer, I might throw in some thoughts on the sizing if it would help. It probably has a gauge labeled on the front that tells max-min readings? What do you have and we can go to some online converters to do a rough guess about how it may work.
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post #5 of 6 (permalink) Old 04-14-2019, 04:23 PM Thread Starter
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I finally got the regulator yesterday. It was shipped in original box marked on the outside "Calibration only! Please store after use". It looks absolutely new. Unfortunately the rotometer is the wrong range: 0 to 5 cfh. And it has CGA 350 fitting on it. Thats all right, I'll get a Dwyer 50 cc/min gauge and a good metering valve, probably a swagelock or a hoke. With a vernier knob (because I like 'em). I still got a brand new 2 stage properly sized regulator for $120 shipped. I'll have maybe $270 in it.
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post #6 of 6 (permalink) Old 04-14-2019, 08:58 PM
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How much CO2 is put into a tank has lots of things that change the amount, so we do get into a real guess when first starting a new tank but the 50CC per minute seems pretty high for me. But then tank size, how it is diffused and how much is lost are all going to change the answer. One safe way to figure what your tank needs is to set the tank and get the CO2 going through whatever diffuser you are using and then do a rough measure/guess at how much you want. If you have it going and stick the end of a tube up into a calibrated glass like a test tube, you can let it run for X amount of time and see how much, then buy the flowmeter.
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