Check Valve Problem - I think?

lbk · Jan 24, 2010

I installed a high quality check valve near the base of my sump pump - its not one of those flapper check valves. It worked perfectly. Really quite, no backflow at all. Then, I installed a battery backup pump and I used the same style check valve near the base of that pump. Now, when the main pump shuts off, its like I have no check valves at all. The whole system gurgles and you hear water and air moving back through the pipes. I tried multiple positions for the check valves, and nothing helps at all. If I disconnect the battery back up and plug the pipe, everything is fine - no noise at all.

What could cause this. Its not a faulty check valve, because I've tried several of them and it makes no difference. Any ideas on this?

Thanks.

Cacher_Chick · Jan 24, 2010

Hard to say without seeing it... posting a picture of your installation might help.

Sponsor · 2022-01-29T12:20:58-0800

bobber33 · Mar 13, 2010

lbk said:
I installed a high quality check valve near the base of my sump pump - its not one of those flapper check valves. It worked perfectly. Really quite, no backflow at all. Then, I installed a battery backup pump and I used the same style check valve near the base of that pump. Now, when the main pump shuts off, its like I have no check valves at all. The whole system gurgles and you hear water and air moving back through the pipes. I tried multiple positions for the check valves, and nothing helps at all. If I disconnect the battery back up and plug the pipe, everything is fine - no noise at all.

What could cause this. Its not a faulty check valve, because I've tried several of them and it makes no difference. Any ideas on this?

Thanks.

I have the same problem. Did you drill in a small hole in the discharge pipe just above the main pump and below the check valve. I did and that still didn't help. Wonder if you need another hole on the backup pump?

Ballvalve · Mar 13, 2010

Are you sharing one outlet pipe?

bobber33 · Mar 14, 2010

One pipe for each pump that y into a common discharge pipe.

Ballvalve · Mar 14, 2010

Do a search for Zoeller sump pump installation diagram. Find it in PDF. The check valves should be designed for sump pumps and above the basin. The 3/16 hole should be drilled about even with the pumps "top", and kept open.

Describe this high quality check valve you have. Take a look at Dean Bennet supply for a good look at a Zoeller check valve.

Check Valve Problem - I think?

lbk

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Cacher_Chick

Test, Don't Guess!

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bobber33

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Ballvalve

General Engineering Contractor

bobber33

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Ballvalve

General Engineering Contractor

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