They are not just to move a stuck cleaner. The valve aids in the cleaning by repositioning the cleaner from time to time. Otherwise, as the tires wear the cleaner will start moving in a pattern, not cover the whole pool, and never change unless moved manually. It will still go back to that pattern eventually.
Make sure that the hose-float closest to the back-up valve is right against it. Seems to work better this way and keeps the valve from dragging on the walls and floor.
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