Is a check valve necessary for a sump pump installation?
I have about 8 ft - 1 1/2" pvc pump coming up out of the pit to a 90 degree
elbow which is then exiting the house. There is an 1/8" bleed hole at the
fitting near the pump. The pump is a high-output model than is in place
just for extreme emergencies. The pit has some small holes in the bottom to
It seems like the check valve would hinder water flow. Therefore, is a
check valve necessary?
Thank you for your time.
it depends on how the float switch is set.
without a CV, when the pump pumps, and the water in the sump lowers
and the pump stops, the water left in the pipe will drain back into the
sump... if it is a significant amount of water the pump will start agin
soon and repeat the cycle so you waste a lot of pumping the water up
and down the pipe..
if you can set the float switch for lots of hysteresis so the pump
runs long enough so the water in the pipe is a small fraction of the
amount pumped then its not a problem..
in fact I don't like a check value because after the rain stops, the
water left in the pipe just sits there forever and can freeze or cause
generally water left in the sump will seep into the ground but water
trapped in the pipe by the CV will stay there a long time..
I also like to put a small air relief hole near the highest point in
the pipe so that when the pump shuts off, the water drains back down
and also forward.
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