Check valve barb and tubing issue - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-30-2013, 10:26 PM Thread Starter
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Check valve barb and tubing issue

I just received an order of check valves with 1/8" barbs but found that the 1/8" tubing (internal diameter) just sort of slips over rather than really snugs on as I'd expect. I'm assuming this will cause a problem when the co2 is turned on.

Does this make sense? Do I need to get 3/16" barbs or was I sent the wrong size?

Thanks.
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post #2 of 7 (permalink) Old 01-30-2013, 10:39 PM
Dude Where's Your CO2?
 
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You can do a leak test by applying soapy water on the 2 ends or tie it with small zip tie.
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post #3 of 7 (permalink) Old 01-30-2013, 11:20 PM
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Something's wrong - they should definitely be a snug fit if they're 1/8" barbs and 1/8" ID tubing. Are you positive of both the tubing size and the barb size? Standard airline tubing has the same size OD as our CO2 tubing, but the walls are thinner, meaning the ID is larger at 3/16".

I'd start with checking the measurements with a tape measure and then decide whether you need to re-order tubing or cv's.

A zip tie might work, but it's not something I'd try.
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post #4 of 7 (permalink) Old 01-31-2013, 12:44 AM Thread Starter
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Quote:
Originally Posted by kevmo911 View Post
Something's wrong - they should definitely be a snug fit if they're 1/8" barbs and 1/8" ID tubing. Are you positive of both the tubing size and the barb size? Standard airline tubing has the same size OD as our CO2 tubing, but the walls are thinner, meaning the ID is larger at 3/16".

I'd start with checking the measurements with a tape measure and then decide whether you need to re-order tubing or cv's.

A zip tie might work, but it's not something I'd try.
I just double checked the tubing I received and it's 1/8" inside diameter (It's marketed for CO2). I checked the us plastic website where I got the valves and 1/8" is the smallest size they sell. Upon measuring the check valve it looks to be that size at the fattest part of the barb, but, again, there's really not much of any resistance to putting it on or removing it. It makes contact, for sure, but definitely isn't a very tight fit.
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post #5 of 7 (permalink) Old 01-31-2013, 12:47 AM Thread Starter
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Maybe I'm being paranoid. To clarify a feel thing as much as possible, it's not like the check valve is about to fall off the tubing, but it does slide right on. I was expecting to, if not fight it on, at least work it on a little bit.
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post #6 of 7 (permalink) Old 01-31-2013, 12:52 AM
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Check valve barb and tubing issue

You could always put a small stainless steel hose clamp on it
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post #7 of 7 (permalink) Old 01-31-2013, 01:49 AM
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I've noticed the same thing with my Co2 setup.
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