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matt151617 04-14-2013 08:46 AM

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I have a sump pump that is very loud due to the pipe setup. When it initially turns on, there's a loud sound as the air is purged out of the pipes. After it shuts off, there is a gurgling sound as air bubbles go into the pipes. I've installed 2 check valves, along with an air admittance valve, but it hasn't helped. The area between the middle check valve and the foundation wall is inaccessible due to a large cabinet someone put up. Is my only option to extend the pipe through the foundation wall, install the air admittance valve at the elbow, then drop down into the ground on the outside of the house?

Also, the pipe empties open ended into the front yard. I'm not sure if moving the last check valve to this opening would help with anything. All pipes are 1-1/2 PVC and ABS.

joecaption 04-14-2013 09:02 AM

Only need one check valve at the pump.
Why the AAV?

matt151617 04-14-2013 10:12 AM

There's a vacuum forming, causing the gurgling. I drilled a hole in the pipe outside the house before installing the AAV and you could hear a whistle as the air was sucked in. How do I counteract this vacuum?

djlandkpl 04-14-2013 10:56 AM

Like Joe said, you only need one check valve near the pump. Are you using the check valves to keep the pipes full of water?

matt151617 04-14-2013 10:59 AM

Yes, but the noise is still coming from the small section between check valves.

djlandkpl 04-14-2013 11:19 AM

This is a guess not knowing the check valves installed. Since the 2nd and 3rd valves are mounted horizontally, I suspect water is still getting past the flappers. You don't need an AAV.

Ghostmaker 04-14-2013 11:33 AM

An AAV is worthless in your situation. They seal up tight with positive pressure. Remove all the extra check valves and get a good solid one by the pit above it would be best in a vertical position. It also helps to drain the pipe toward its point of disposal once you turn horizontal.

matt151617 04-14-2013 12:24 PM

The AAV is at least helping to release the vacuum and eliminate some but not all of the gurgling. The system originally had only 1 check valve about 1 foot above the pit. The other valves were added in later to address the gurgling noise.

djlandkpl 04-14-2013 12:30 PM

Water is getting past one of the check valves sine you are hearing air get sucked in.

matt151617 04-14-2013 03:40 PM

I was under the impression that any drain required air to be admitted into the system or it would not function properly. This system is independent of the household plumbing and not connected to a stack or any other vent.

A friend who was a former plumber told me drains hate 90 degree bends and to either install 45's, use flex pipe, or extend the pipe and elbows to outside the house to eliminate the noise.

djlandkpl 04-14-2013 03:55 PM

A gravity drain needs air like you house drains. Your sump pump is mechanical. The water is being pushed out. Adding air adds noise. Stop the pump and the water stops. Water is getting past your check valves and that is creating the vacuum. Check your valves to see if the work in a horizontal application.

matt151617 04-14-2013 04:07 PM

I'm positive it's not the check valves. The problem existed before those were ever installed.

djlandkpl 04-14-2013 06:06 PM

Assuming the vertical check valve is functioning, prior to adding the horizontal check valves any remaining water in the horizontal piping would drain out from gravity. Once a big enough air bubble got into the pipes, it would drain most of the water. When the pump started up, sloshing sounds.

If you put in check valves that aren't suited for horizontal use, nothing has changed and the water is still draining from the horizontal pipes.

One way to test this is to run the pump until you have water coming out of the discharge. Turn off the pump wait 10-15 seconds for the water in the vertical pipe outside to empty. Stick a bucket under the pipe and wait. See if a water fills the bucket. Also check the vertical valve by running the pump and shutting it off. Listen for water running back into the sump.

joecaption 04-14-2013 07:29 PM

Are they swing checks or spring checks?
A simple one like this is what you should have.

Ghostmaker 04-14-2013 09:32 PM


Originally Posted by matt151617 (Post 1159039)
The AAV is at least helping to release the vacuum and eliminate some but not all of the gurgling. The system originally had only 1 check valve about 1 foot above the pit. The other valves were added in later to address the gurgling noise.

When your pump fires the AAV will close as it is designed to do.

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