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Old 04-16-2014, 08:36 PM   #1
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Air Admittance Valve Not Opening!


I currently do not have an air vent for our kitchen sink and dishwasher. I installed an AAV under the sink as a temporary solution until the weather gets nice and I can get up on the roof. Please keep that in mind when answering this question as I do not plan to keep this permanent. I know a lot of people do not like them and this is only a temporary solution. I would really like to get this working for the time being.

This is how I installed it under the sink. I've tried both of these AAV and neither work.

http://www.homedepot.com/p/Oatey-Sur...9016/100201861

http://www.homedepot.com/p/Oatey-1-1...9012/100204205


When I turn the water on after about 1 minute the sinks starts to back up like it can't drain. All I have to do is unscrew the AAV and the water rushes down the drain and I can feel the air being sucked in by my hand. The 2nd I screw the AAV down it stops draining.

The trap inside the AAV is not opening. I can confirm this on both models that I have put in. It is over 4" above the trap. It's almost as if there isn't enough suck-ton to open the valve. I find that hard to believe though since the 2nd I unscrew it the amount of suck-ton that I feel by my hand while unscrewing it.

Any idea's or things to try? The problem seems to be that the flap on the AAV is not opening on both models.
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Old 04-16-2014, 08:37 PM   #2
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Old 04-16-2014, 08:56 PM   #3
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Is it possible that I have positive pressure in the line and it's actually closing the AAV even more?
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Old 04-16-2014, 08:58 PM   #4
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Just a guess. The Tee is allowing water to go back up the pipe with the AAV. That pressure is causing the AAV to close so water does not come out.
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Old 04-16-2014, 09:00 PM   #5
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Originally Posted by djlandkpl View Post
Just a guess. The Tee is allowing water to go back up the pipe with the AAV. That pressure is causing the AAV to close so water does not come out.
The AAV is above the trap though. Tech it should never even reach that far. Also, why would the sink completely drain the 2nd I remove it?

Thank you for the reply!
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Old 04-16-2014, 09:03 PM   #6
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The water will not reach the AAV with your set up but it doesn't know it. Where the tee is you really need a wye so it directs the water down. The way it is now, some water can take a left and go up the AAV pipe. The water flows when you turn the AAV because you are breaking the vacuum.
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Old 04-16-2014, 09:05 PM   #7
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The water will not reach the AAV with your set up but it doesn't know it. Where the tee is you really need a wye so it directs the water down. The way it is now, some water can take a left and go up the AAV pipe. The water flows when you turn the AAV because you are breaking the vacuum.
I see what you are saying but I do not see how water would naturally go up the T. One the water is running down so it should tech skip right over the T, 2nd I have it angled so the water should continue going down the tub even if any got inside of it.
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Old 04-16-2014, 09:08 PM   #8
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Take the pipe off that come out of the tee towards the AAV. Run your sink and see how much water comes out.

Since it's temporary it might be easier to unscrew the AAV when you need the sink vs investing a ton of time and parts.
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Old 04-16-2014, 09:12 PM   #9
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I think you get a bit of bottleneck at the tee because of the different pipe diameters.
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Old 04-16-2014, 09:15 PM   #10
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Ok I can confirm positive pressure.

I put a plastic bag over the pipe with the AAV off and the thing filled up like a balloon!

What would be causing positive pressure to that extent? Does anyone have idea's?
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Old 04-16-2014, 09:20 PM   #11
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It all wrong Water has to drop below the AAV above the trap.
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Old 04-16-2014, 09:24 PM   #12
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It all wrong Water has to drop below the AAV above the trap.
Would that cause positive pressure?
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Old 04-16-2014, 09:26 PM   #13
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Why did you decide to add theaav in the first place- slow drain?
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Old 04-17-2014, 05:23 AM   #14
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You have an S trap---that's bad--vent must be allow air in above the P=trap--

Remove all of your piping---start pipe at the floor---add a T- for a P-trap--
Then place the AAV above the T---
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Old 04-17-2014, 07:17 AM   #15
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Why did you decide to add theaav in the first place- slow drain?
Yes because it was not properly vented. The only vent was a small copper piping coming out underneath the sink in the craw space. It didn't allow enough air to travel through it.
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