Hi Brad With 2 check valves leaking I’d look for a broken pipe or a corroded fitting.
If there is anyway to isolate between the 2 check valves then you could measure the pressure drop on both sides which should point to the direction of the leak. Jay > On May 25, 2024, at 7:41 PM, Bradley Bassett via RE-wrenches > <re-wrenches@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. > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
