Check Valve for Outdoor Sump

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Old 09-13-19, 08:27 AM
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Check Valve for Outdoor Sump

I'm hoping to complete installation of a French drain in my backyard this weekend. My sump pit is about 42 inches deep. Pumping water vertical about 44 inches, then angled slightly up an incline about 4 feet to where gravity will take over moving the water away. The slightly angled PVC going up the incline is only a couple of inches in the ground. My check valve will be just above my sump pit. What do I do about the water between my check valve and the point gravity takes over? I assume water will always be in that short section. Should I wrap it in insulation? How about a small (maybe 1/8) hole drilled above the check valve allowing the water in the short run to bleed back into the sump pit? I'm sure any water in there will freeze and potentially crack the PVC.
 
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Old 09-13-19, 08:43 AM
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Is this inside or outside?
 
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Old 09-13-19, 09:15 AM
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The sump pump, pit, pipes, 100% outside.
 
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Old 09-13-19, 09:46 AM
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What is your location and what is the construction of the sump pit and cover?
 
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Old 09-13-19, 11:20 AM
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I'm in Indianapolis. Sump pit is thick plastic with about 2 inches of number 4 gravel around it. Sump pit is 36" tall and is set below grade. I built a riser out of pressure treated 2 x 12s. Couple inches of the riser sticks up above grade, so the pit is approximately 46 down. Riser sits on gravel around sump pit. I'm going to place some type of insulation above the pit in the riser. Riser has a cover. As I was looking at the setup over lunch, I thought a small hole where the PVC crosses over the gravel, after coming out of the riser would be a good place to bleed the water.
 
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Old 09-13-19, 11:50 AM
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You'd want as much of the drain line to be emptied as possible to eliminate freezing.
In your application.... I don't think I'd use a check valve.
 
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Old 09-13-19, 11:53 AM
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That makes sense. The only water that can possibly get back into the pit is the short run up the slight incline.
 
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Old 09-14-19, 06:55 AM
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If you drill a bleed hole above the check valve, you might as well not have the check valve. All of the water above would have drained out the bleed hole and dropped back into the pit before the sump pump kicks on again normally.

As well as the bleed hole detracting from the efficiency of the pump because on every pump cycle some water wil be squirted out of the bleed hole, ending up back in the pit, and having to be repumped out.
 
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