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MEXANDME
09-08-2011, 10:21 PM
I have a customer whose check vave is stuck open. The pump is a 1 HP above ground and the water source is a community pond. When I prime the pump; I am getting 23 gallons per minute with a bucket test. But, as soon as you turn off the pump, you can see the water level at the pump immediately disappear.

The faulty check valve is about ten feet out into the pond under about three feet of water and will be very difficult (but not impossible) to replace.

My question is this. Can I install an additional check valve back up on the bank (underground) and just leave the faulty one where it is?

FYI, the suction line is 1 1/4" PVC.

Thanks,

Mex

Mike Leary
09-08-2011, 10:24 PM
I always thought that was called a "foot valve".

MEXANDME
09-08-2011, 10:33 PM
Mike,

In this case it is actaully a check valve. The is ten feet of well strainer beyond the check valve. The check valve was actaully on land several years ago when installed but the lake has risen significantly since then.

Thanks,

Mex

Mike Leary
09-08-2011, 10:41 PM
Hmm, maybe someone else has a clue, but every pond system I've ever dealt with had a foot valve, period. They needed to be serviced every few years, but the sites I serviced had a buoy marking the location. and a rowboat.

Wet_Boots
09-09-2011, 01:10 AM
You can have a check on the pump inlet. I never use a foot valve if I can do without one (pump lift of 5 feet or less) because I want to be able to drain the suction line without removing it from the pump.

AI Inc
09-09-2011, 06:38 AM
yes you can add an additional CV anywhere along the intake you so desire. Closer to the source the pump will struggle less.