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check valves


Josh

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hands up all those who use these raisehand.gif

I just walked into the lounge room to find that mine arent working. Its nice to find out the hard way. 50 odd liters of water on the carpet woot.gif . How happy is my wife right now? To make it worse the air line was leaking onto what is now a melted power board shock.gif I only found it because of the nasty smell coming from inside the cabinet.

Check your check valves people. I never thought it would happen to me

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Hi Josh,

Lucky it wasn't worse I guess. I use them religiously (where the pumps are lower than the tanks that is). They have saved me a few times.... rolleyes.gif

Andrea smile.gif

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These ones were the spring ones.

The power board was full of water. a little hot and a little twisted blink.gif

I didnt think they could fail. This one did, so I guess I be visiting the LFS tommorrow thumbup.gif

Josh

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I tested mine before buying, by blowing into them both ways, to make sure they do go one way and don't go the other wink.gif

What a bugger though !

I wouldn't be going near a full-of-water powerboard near wet carpet blink.gif

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I have found that the check valves themselves can block the flow of air as well.

For those of you who aren’t aware of an alternative, that mechanically cannot fail, you simply need to have an airline tubing long enough to make a small loop above the tank’s water level.

Any back siphoning that may occur when power goes off, will first have to get over the height of this loop, and provided you have it far enough above the water level, it can’t do it.

The other alternative is of course to have the airpump above the water level, but this is not always a choice.

Craig

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Just from the way they look I think the foam ones are better than the springs. Plus the foam valves cost that little bit extra. But price isn't always an indication of quality blush.gif

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I use them despite the fact that they slowdown the airflow, in the past i didn't use them and had a couple of mishaps that i was able to get to in time before it caused any damage. Mine have saved me a few times and i know they work (several small power outages). I use the spring loaded ones, when i get home from work ill let ya know what the brand is.

Anthony

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