Will this valve work for a DIY CO2 system? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 11-22-2015, 05:19 PM Thread Starter
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Will this valve work for a DIY CO2 system?

I'm doing some eBay hunting, trying to find all the pieces I need for a DIY CO2 system. I understand I need an on/off valve for my paintball tank and am wondering if this piece would do the job. Any tips would be greatly appreciated!







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post #2 of 7 (permalink) Old 11-22-2015, 05:30 PM
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Yes, But.

That's an on/off valve. You'll need another valve to screw into it to regulate flow, and that valve needs to be rated for 800+ psi. Which means that regardless of what valve you get, it's going to be extremely difficult to fine-tune the CO2 flow, and it will likely fluctuate.

You won't be able to use a solenoid with that unit because of the high pressure, so you'll have to either leave it on 24/7 or turn it off and on, manually via the on/off valve, every day.

You'll need a diffuser and tubing as well, as you likely know.
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post #3 of 7 (permalink) Old 11-22-2015, 05:35 PM Thread Starter
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I was just going to use a needle valve, like this guy:

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post #4 of 7 (permalink) Old 11-22-2015, 05:42 PM
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If it's what I remember from waaay back, that's a bad idea. That valve is rated for something like 200-300 psi, so you'd be subjecting it to far more pressure than it's designed for.

That's one of several reasons why this particular DIY method has fallen out of popular use.
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post #5 of 7 (permalink) Old 11-23-2015, 12:31 AM
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That particular "needle valve" does not really offer the amount of control (precision) that is required for our needs. I would recommend against it.

Anthony


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post #6 of 7 (permalink) Old 12-06-2015, 11:57 AM
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I agree! Do not use that valve.

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post #7 of 7 (permalink) Old 12-11-2015, 07:49 AM
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So it turns out I should've just bought a regulator used. I went this paintball method and albeit terribly finicky to set it pretty decent. I'm running 2 bps and had no problems. The paintball shops in South Africa give free refills so I don't pay anything to keep it running.

Mine runs 24/7 fish and shrimp are happy and drop checker is a brilliant green. Plants are also very happy and growing well.

I know ista makes a needle valve which is better than that needle valve. You will however have to make sure you get a fitting to join it to the bottle with the correct thread.

Enjoy!


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