Kitchen sink drainage issue..

[bballtwenty2]

-I replaced my double kitchen sink for a single sink.
-Now the water drains slow, gargles, and washer machine slightly backs up into it. It has been going on for a few years and has gotten no better or worse.
-I've had multiple plumbers come clean the drain lines, and check the vent pipe to no avail.
-I started researching and found that an "aav" couple possibly solve the issue or at least i hope!
-I really think the issue is a venting issue since the draining was not a problem with the double sinks.

Any advice would be appreciated!

 

[Reach4]

Bad venting does not cause slow draining. There is a different problem.

1. Where is that washing machine standpipe with respect to the kitchen drain? The problem sounds like a problem after where the sink drainage joins the washing machine drainage. 2. If you don't use the sink or washer overnight, and then drop a half gallon of water into the kitchen drain, does the water go down fine? If not, how about a quart? What I am getting at is if there is a clog, the more water the pipes accept quickly, the farther the clog is.

Consider posting photo that shows the bottom of the sink and the exit into the wall and the trap... I am not a plumber.

 

[Sponsor]

 

[bballtwenty2]

Bad venting does not cause slow draining. There is a different problem.

1. Where is that washing machine standpipe with respect to the kitchen drain? The problem sounds like a problem after where the sink drainage joins the washing machine drainage. 2. If you don't use the sink or washer overnight, and then drop a half gallon of water into the kitchen drain, does the water go down fine? If not, how about a quart? What I am getting at is if there is a clog, the more water the pipes accept quickly, the farther the clog is.

Consider posting photo that shows the bottom of the sink and the exit into the wall and the trap... I am not a plumber.

-The washer machine is in the next room over.
-Now if you were to run water in the kitchen sink it drains for a second, then starts to slow down and back up.
-While filling up the sink if I suction cover the drain then remove the suction once the sink fills the water drains super fast. One it drains though I hear a gurgle.

 

[bballtwenty2]

Here is a pick of my plumbing for that sink. Like I said the washer machine is on this drain behind the wall and also the dishwasher.

 

[hj]

It is probably a problem that an AAV CANNOT cure.

 

[Plumber69]

-The washer machine is in the next room over.
-Now if you were to run water in the kitchen sink it drains for a second, then starts to slow down and back up.
-While filling up the sink if I suction cover the drain then remove the suction once the sink fills the water drains super fast. One it drains though I hear a gurgle.

Take a picture. I had this happen once. Turns out there was a ptrap under the sink and another one in the crawl space

 

[bballtwenty2]

It is probably a problem that an AAV CANNOT cure.

Well i wonder what would cure it then, since this only started when converted from a double drain sink to a single drain.