sump pump back check valve

Old 10-08-13, 08:55 AM
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sump pump back check valve

Does it matter if the back check valve installed for the sump pump was installed at a 90 degree angle? Our basement has flooded 3 times and we were thinking the sump pump must have a problem. While watching a DIY video on replacing the sump pump and hearing how the check valve works I am now wondering if because the valve was installed at an angle that the flap may not be closing correctly. Should the check valve be installed straight up and down on the pipe or does it matter?
Old 10-08-13, 12:05 PM
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Welcome to the forums.

I prefer to install them straight up and down. Keeping it up higher towards the horizontal run will keep it from banging closed when the pump stops running.

Many check valves can be installed in the horizontal run but if you look inside most of them you'll see a hinge on the rubber stopper. The hinge usually needs to be up.

The check valve just keeps water from coming back into the sump pit. Is that where your water is coming from or did the pit overflow ?
Old 10-08-13, 12:29 PM
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Also you could have got air locked if a proper weep hole was not drilled down near the pump on the discharge pipe... usually only 1/8" hole...
Old 10-08-13, 05:30 PM
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If the discharge pipe is not too long you could just skip the check valve all together. True all that water will flow back into the pit. But if it's not a constant thing don't worry about it. As an added plus, by not using the check valve it's a lot less messier when it comes time to pull the pump for service.

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