Which CO2 check valve are you using?

Kyalgae

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I have one of these check valves from Green Leaf Aquariums, http://greenleafaquariums.com/products/industrial-check-valve.html, I like the construction of the unit, but the weakness is it has push fittings for the 1/4” OD CO2 hose, I noticed today while it was sumbmerged I in water, as I took a co2 rate measurement, that it leaked a little bit. It’s a small leak, but I find it annoying. It leaks out of the push connects.

Doing a reverse image search it looks to be manufactured by https://www.specialtymfg.com/configurator-plastic-check-valve/ they should have had a compression fitting for something that would be operating at a min pressure of 30 psi.

What check valves do you use? Which ones do you find the most reliable?

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Phishless

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A compression fitting would be more appropriate for 30 PSI.

I use Petco cheap ones, using 3 PSI to a reactor and 1.5 PSI will open the check.
I use 2 in series as a safeguard.
 

berarma

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I have the JBL proflora safestop for maybe 3-4 years. I've used it in the 15-35 psi range. It looks very solid, I think it's reliable but I'll check for leaks and report.
 

burr740

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I have the JBL proflora safestop for maybe 3-4 years. I've used it in the 15-35 psi range. It looks very solid, I think it's reliable but I'll check for leaks and report.
That looks essentially leak proof because it's molded in one piece, plus compression fittings.

I may try one of those next if somewhere will ship to the U.S.
 

Kyalgae

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https://premiumaquatics.com/product...MIh_7E9fmA2AIVhYl-Ch1NsAliEAQYFiABEgL-HvD_BwE I have been using these US Plastics check valves in my DIY CO2 system for at least 2 years now. Zero problems, and they are very cheap. I have 4 of them in the set-up now, with one always in the tank water.

I like how they have ratings, 1 to 150 psi! Nice. Now I just need to find some that ship to Canada, or someone who’s sells them here.

Edit: looks like premium aquatics does ship internationally, but I wish they had a snail mail option... maybe I’ll give them a call. They only list a $41 dollar option for shipping internationally.
 
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tiger15

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The biggest problem Ive had from cheapo check valves is not failing but leaking CO2. That's in the 15-25 psi range. Its easy to test by holding it down in a bowl of water when the co2 is running

These work pretty good - https://www.amazon.com/Spring-aquarium-Diffuser-bubble-counter/dp/B00SE9VU0I
I placed my check valve submerged in the tank so if it leaks, I can tell. Most people don’t have the option if their reactor is placed outside. I use Tunze Diffuser that is placed inside the tank.
 
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skija

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ADA check valve is best i can buy here in Romania , the rest i bought ...like JBL were cracking after a while (1 month)