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Author:
emontag (NY)
My plumber installed a sump pump without a check valve. Instead there is a 1/4" hole in the pvc that runs up from the pipe that is about a foot above the pump. It's above the water line but still in the pit. When the pump runs, some water is ejected from the hole back into the pit but when the pump stops, the water above the hole can drain back into the pit. Has anyone ever seen that type of installation. My web research has found nothing like that. Every place I look it says you need a check valve (unless it is built in to the pump). However, if you do it this way, there is one less thing that can break. That's the only reason I can think of.
Recently my pump has been cycling on and off after a pump. I'm not sure if this installation is the cause because in ten years this has never been a problem. (The present pump is about 4 years old and was installed by the same guy who did the previous one.)
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Author:
KCRoto (MO)
The hole should be there, but there should be a check valve above it.
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Author:
m & m (MD)
The reason for the hole is to prevent air-lock. Without a check valve, there is no reason for the pump to become air-locked, and no need for a relief hole. I'm guessing there is a check valve someplace in the discharge and that is why he drilled the hole.
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