Sump Pump issue

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Old 05-29-13, 07:11 PM
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Sump Pump issue

My pump works fine as far as getting rid of the water....but every time it kicks on and pumps out of the well, when it's done pumping, there is a loud knocking sound

Any ideas as to what to troubleshoot first.
 
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Old 05-29-13, 08:14 PM
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That knocking sounds like the check valve banging shut. It should be located in the vertical pipe somewhere near the pump.

There may be too much water pressure on it. Changing it may possibly help.
 
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Old 05-29-13, 08:38 PM
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Or may need to add an additional check valve. The run may be too long. That bang is the surge of water coming back and slamming the check valve closed.
 
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Old 05-30-13, 04:55 AM
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Also, if your piping can move around the drain pipe could be bumping against something when the pump shuts off.
 
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Old 05-30-13, 01:30 PM
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Check valve...... mine does it all the time, but it like it cuz it lets me know things r working.
 
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Old 05-30-13, 07:55 PM
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Here are some pictures of my situation...really didn't appear to be a situation where the pump could move much at all.

There appears to be a check valve already in the well. If I was to add another, where would the recommended location be. Also, does anyone think it matters that the vertical pvc connecting the pump to the horizontal run out of the house is slightly angled (shown in pic)
 
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Old 05-30-13, 08:24 PM
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The horizontal pipe should pitch the other way. This way after the pump stops the water in that pipe will drain outside by gravity, That check valve is too low from the install instructions I have read.

Is the check valve made for vertical installs? If not change it.

Plus is there a weep how at the bottom of the pipe that turns into the pump?

This weep hole is done buy the installer, and most rookies dont know to do this.

If you plan on doing nothing but a check valve, add one to the horizontal pipe and the issue should go away.

No weep hole and check valve that close, you have a good chance to get the pump air locked.
 
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Old 05-30-13, 08:39 PM
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Thanks.

IYO, if I add a little bit of length by coupling it with some more pvc and add a check valve, would I be safe in what I'm doing and likely take care of the issue at the same time

Lastly, I picked one of these up today.

Shop AMERICAN VALVE 1-1/4-in PVC Sch 40 Socket In-Line Check Valve at Lowes.com

Does this look like the recommended check valve for the job.
 

Last edited by jslsker; 05-30-13 at 08:55 PM.
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Old 05-30-13, 08:50 PM
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Mike......correct me if I'm wrong.....aren't most check valves of the flapper type...... and won't work in a horizontal pipe ?

Do you have to specify a check valve specifically for a horizontal installation or does just the orientation of the flapper make the difference ?
 
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Old 05-30-13, 09:10 PM
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Mike......correct me if I'm wrong.....aren't most check valves of the flapper type...... and won't work in a horizontal pipe ?

Yes but he has the horizontal pipe pitched back to the pump. An additional check valve will prevent the water in the whole line to come back to the lone check valve at the pump. I believe a flapper type will work in his situation.

Zoeller pumps show a vertical check...Liberty pumps show a horizontal check in their instructions....

Why I stated it this way.

If you plan on doing nothing but a check valve, add one to the horizontal pipe and the issue should go away.
My theory anyway......


IYO, if I add a little bit of length by coupling it with some more pvc and add a check valve, would I be safe in what I'm doing and likely take care of the issue at the same time
My opinion... Raise the check valve.... install a weep hole....and pitch the horizontal pipe down towards the exit point.

PJ.. You have any ideas that may work better? I have not done sumps in aboyt 10 yrs now....

( No money in it...LOL)
 
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Old 05-30-13, 09:30 PM
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Thanks again, guys.

Unfortunately, don't think I can pitch it down to the exit point any more than it is, since it already up against the floor joists.

Does this check valve look correct?

Shop AMERICAN VALVE 1-1/4-in PVC Sch 40 Socket In-Line Check Valve at Lowes.com
 
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Old 05-31-13, 06:04 AM
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Oh I see in your pic now as the pipe exits the house it goes up to get over the sill plate and out... Is this correct?

That check valve you link is a swing, or spring?

I like the ferco type. Even though a swing there is a top for oriantation to put on the horizontal.

Less work to install.




 
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Old 05-31-13, 07:31 PM
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The question that pops into my head is why your pipe has so many bends and such a long run to discharge out of the house? Why didnt the installer just go up and out the wall above the water meter or the pit. Sometimes builders do things that make you go ?????
 
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Old 06-01-13, 10:14 AM
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If they went just up and out, it'd be going through the front of the house and a brick elevation
 
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Old 06-01-13, 11:02 AM
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No.... your idea is good Mike.

Most of the check valves are of a flapper type so if you use it in a horizontal run the hinge part must be up. The Fernco one Mike is showing is a good choice. Probably not available at the big box guys.... you'd have to go to a plumbing supply.

Can't tell if the one in your link will work for you.
 
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