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Skipweasel

In article ,
says...
As the valves tend to be sealed you cannot get to their innards. I believe
that the water pressure is used to shut off the flow. Would it be possible
to electrically open the valve and back flush it somehow???

You wouldn't need to apply power - just backflushing will do, the valve
will open on its own in a reverse flow situation.

--
Skipweasel.
Never knowingly understood.