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Old 03-10-2014, 12:50 PM   #1
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Sound after Water Drains from Kitchen Sink

We had been smelling an unpleasant odor around the kitchen sink area for a few days before discovering a broken pipe under the kitchen sink. The pipe that was broken was the one on which the vent was mounted. We replaced a section of the broken pipe and the vent. Now, when we fill the sink and then drain it, as the last bit of water is being drained there is a whiney sound/whistle made by what we believe is the vent. A couple of people have said this sound is "normal." However, we have had our current coach for 1 1/2 years and the previous vent never made that sound when water was being drained. One of the two occupants of the RV still thinks there is an unpleasant odor around the sink, so I'm wondering if perhaps the new vent is bad, or there's another problem yet to be discovered. Thanks in advance for any advice.
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Old 03-10-2014, 02:13 PM   #2
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Yes it reads as if you have a faulty vent.
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Old 03-10-2014, 02:24 PM   #3
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If you are talking about the air admittance valve that is used instead of a local roof vent then it does sound like it could be the flapper in the valve.

That valve is supposed to open when the gray tank is dumped to prevent the water in the trap from being sucked out.
As far as I know it doesn't normally open when a sink is drained but I cpuld be wrong about that. In any case it sounds like the flapper is moving.
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Old 03-10-2014, 02:40 PM   #4
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It sounds like you have a bad vent. Did you use teflon tape or other threat sealant on vent threads? Air might be leaking there, but probably it's the valve. The valve is to allow air to enter so water isn't siphoned out of the trap, whether normal sink use or draining the gray tank. (Gray tank has a roof top vent to air displacement when draining tank.
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Old 03-10-2014, 02:54 PM   #5
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Quote:
Originally Posted by BFlinn181 View Post
e. The valve is to allow air to enter so water isn't siphoned out of the trap, whether normal sink use or draining the gray tank. (Gray tank has a roof top vent to air displacement when draining tank.
My bathroom sink is connected directly to the roof vent and they still put an air admittance valve on the drain line anyway.
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Old 03-10-2014, 03:16 PM   #6
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Air admittance valves are installed on a venting system without a roof-top vent similar to a sink installed in an island in your house kitchen. The whistleing sound is created by flow out of the sink that is created by a venture effect as the water flows rapidly. A slow draining sink will not whistle versus a fast draining sink. Roof top vents serve 2 purposes: they emit sewer gases and admit air during the discharge of water. If you still have a sewer smell, it could be a faulty trap or a trap being siphoned from downstream water flow.
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Old 03-11-2014, 09:53 AM   #7
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Thanks for your responses. Yes, a more accurate term would be the air admittance valve. There was a grease-type substance used on the threads of the air admittance valve when the pipe/valve was replaced. In addition to the whistling sound as the last bit of water is being drained, there is also a sound that I'll describe as a vibration, and I'm thinking that's coming from the flapper. I'll buy a replacement valve and see if anything changes.
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Old 03-11-2014, 09:56 AM   #8
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Those dead end valves go bad all the time even new ones fail. Replace that before you try other more expensive fixes.
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