Ista spring stop check valve
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Old 03-02-2013, 01:56 AM   #1
Sugardaddy1979
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Ista spring stop check valve


Anyone tried these on a pressurized system? I like the idea of them because they have the compression fittings. What does everyone else use with their atomic diffusers for check valves other than the Swageloks?

http://www.aquariumplants.com/Produc...00577&CartID=2
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Old 03-02-2013, 01:57 AM   #2
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I'm trying to use the kynar ones from us plastics. They won't hold a good seal and leak or the line blows off.
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Old 03-02-2013, 02:25 AM   #3
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The compression valves will help with keeping tubing where it should be. But this is the first I've seen of this particular check valve, and I don't know of any reason it should be trusted beyond any other type, several of which are complete garbage.

There's also this SMC check valve from USPlastic.
http://www.usplastic.com/catalog/ite...8670&catid=489

Never tried it, always meant to.
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Old 03-02-2013, 02:36 AM   #4
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Wonder if the 3/16" would be a better choice than the 1/8". The id of tubing seems to be 0.17". 1/8 is smaller than that while 3/16 is slightly larger. Maybe that would give you me a good tight fit. Might try the Ista too just to see. They are $6 shipped on fleabay.
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Old 03-02-2013, 03:22 AM   #5
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So your tubing is not 1/4 - 1/8? Standard LFS tubing has a larger ID than 1/8, but CO2 tubing is generally 1/4 by 1/8, or, if it's Asian, ADA included, sometimes 6mm/4mm. I'd switch to 1/4 by 1/8, but if it's 6/4mm, I'd go with Swagelok/Parker/clone (there are many) compression fittings.

However, the idea of going with 3/16 may work, especially if you're using nonstandard tubing size. Still, unless you're planning on going specifically with ADA equipment, I'd switch everything to 1/4 by 1/8, tubing and fittings included.

Compression fittings are the most dependable. Nonplastic components are the most dependable. 1/4 by 1/8 tubing and compression fittings are the most standard in our hobby.
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Old 03-02-2013, 03:39 AM   #6
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Why not just use a 4" zip tie on the barbs like a hose clamp? Grab the tie with a pair of pliers and lock that hose right down. Works for me. I think you can see them in this pic on the check valve. It's a terrible shot but it illustrates what I mean. $2 at Lowes for 100 of them!

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Old 03-02-2013, 07:46 AM   #7
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I tried zip ties, but didn't use pliers. I'll give that another shot. Thanks.
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Old 03-02-2013, 02:55 PM   #8
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Order the samples from http://www.ark-plas.com. These have been working great for me.
(Thanks mOOse!)
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Old 03-02-2013, 03:01 PM   #9
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Old 03-02-2013, 05:51 PM   #10
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The ones I have still leak even with zip ties.
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Old 03-02-2013, 06:19 PM   #11
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Zip ties wouldn't get tight enough for me either, even with pliers. They're just not meant to apply pressure, IMO.

I used a screw-type hose clamp instead. But I couldn't find one quite small enough for my airline. So I cut a 3/8" length of larger and thicker airline, slit it down the length with a utility blade, and trimmed the diameter down so that when wrapped around the smaller airline it would fit snugly, essentially widening the airline. Then applied the hose clamp over it. This made the hose clamp fit, plus helped cushion and distribute force more evenly - important since these clamps don't have a perfectly circular profile, due to the mechanism. Solved the leaks and pop-offs.
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Old 03-02-2013, 06:25 PM   #12
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Hehe..well they worked for me (although my setup is completely different than the one in the pix I posted now)
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Old 03-02-2013, 06:59 PM   #13
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Hard to tell for sure from the photo, but is your airline a bit "squishy"? That would help a zip tie get that last little ratchet needed.
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Old 03-02-2013, 08:32 PM   #14
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I believe that is just Walmart-purchased airline. Pliable, yes.
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Old 03-02-2013, 09:03 PM   #15
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Ah, mine's more rigid. Can't get any compression on it with a zip tie.
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