[RE-wrenches] Water system with Grundfos SQFlex

[Darryl Thayer]

I had a similar pipe leak. I forgot how I located it, but I used a vaccumn
gauge or pump and to determine how far down the well the the leak was
and pulled the pump and pipe and found a crack.

On Sat, May 25, 2024 at 8:41 PM Bradley Bassett via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I have a water system with a Grundfos SQFlex SQF3-2 pump. I'm getting
> water flow in reverse either through the pump or a leak up to the pump. My
> question is if the check valve on the top of the pump is not sealing, will
> the progressive cavity pump allow water to flow through the pump in
> reverse? I'd think that with a positive displacement pump it would not,
> except very slowly or if it turned the motor backwards which I think would
> be very unlikely. There is about 100 psi head on  the pump.
>
> I think it's most likely I have a leak somewhere in the plumbing, and of
> course another failed check valve farther up in the plumbing. It's possible
> to get failures even with redundant protection if you have two concurrent
> failures, which I must have here.
>
> Brad Bassett
> Old time solar guy who used to do solar pumping back in the '80's and
> '90's. Mostly retired now.
>
>
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