KitchenAid diswasher "belches"

[Andy VH]

During my kitchen remodel (I did it all myself) I removed the garbage disposal as it allowed me to install a large double basin apron sink. I updated the KitchenAid diswaher that has been in the house since I bought it in 2002. It always worked great. Over the years I also reworked the island sink drain/vent system, and confirmed the vent system up through the roof is clear and breathing properly. When I removed the disposal, I routed the dishwasher drain hose to the sink drain connection with a rise in the hose (though not as high as diagrams show, and no air-gap valve).

Now, without the disposal in the dishwasher drain system, the dishwasher makes a loud obvious "ggggrrrrooonnn" belch like sound when changing cycles. I assume the dishwasher vented through the disposal as it never belched like this with the disposal in the circuit. So now I plan to revise the dishwasher drain line to create an air gap higher in the line. I might also install an air gap valve under the countertop behind the sink basin. I get no sink/drain sewer smells from the dishwasher, so if I install an air gap device up underneath the countertop (and not through the brand new granite top) it should provide the venting it seems the dishwasher needs versus what is shown on this diagram:

Anyone see this differently than I plan? Not sure if Wisconsin plumbing code mandates an air gap valve above the countertop.

 

[Pseudonym]

Definitely check first to see if Wisconsin requires the air gap and just do that if so - if you don't and later sell the house you may be required to add one in order to sell.

The area I live in now requires an air gap. At my previous house, the air gap was not required, the drain hose looped up under the counter without the air gap worked fine. If Wisconsin doesn't mandate the air gap the loop will be fine.

 

[Sponsor]

 

[Reach4]

It is the side-job of an "air gap" to spew water if the output will not accept water fast enough. The intended main job is to prevent siphoning of the output into the input.

I mention that because I don't think you want to put an air gap under the counter.

Since your objection is the sound, suppose you put the stopper into the disposal input to muffle the sound.