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Old 02-25-2018, 07:20 AM   #1
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Three check valves on sump pump?


Can anyone think of a reason to have three check valves on a sump pump? I installed a new pump yesterday and am redoing the old fittings. Its just a single pump, no backup. The old pump had a check right above the pit, another check at the top of the vertical pipe, and a third check right after the elbow on the horizontal pipe that exits the house. The valve at the top of the vertical pipe cracked so I removed it. I cant see the need for the check on the horizontal exit pipe. Before I remove that one too, does anyone know why there would be so many?
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Old 02-25-2018, 09:40 AM   #2
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Re: Three check valves on sump pump?


Quote:
Originally Posted by scottyv81 View Post
I installed a new pump yesterday and am redoing the old fittings.
Its just a single pump, no backup. The old pump had a check right above the pit, another check at the top of the vertical pipe, and a third check right after the elbow on the horizontal pipe that exits the house.

Can anyone think of a reason to have three check valves on a sump pump?
No good reason.
Bad reasons abound but probably just that each installer added HIS
check valve and avoided touching what he wasn't being paid to touch.
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Old 02-25-2018, 09:44 AM   #3
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Re: Three check valves on sump pump?


If one has a perfect seal there's no need for more.

Check valves rate right up there for first prize of being the most un-reliable valve made. Depending somewhat on the pipe being used, what could have happened when the DIY person or a plumber thought No. 1 was failing he just added a second rather than replacing the failed valve because if that being simpler and No. 2 valve remained when No. 3 was installed.


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Old 02-25-2018, 12:13 PM   #4
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Re: Three check valves on sump pump?


Thanks, you have both confirmed my suspicions! I prefer fewer leak points so Iím gonna stick with the single check at the pump.


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