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Pilot Float Valves use a sub valve (floating ball switch) as a controller for the main valve. When the water level elevates to the full water level set by the position of the sub valve / ball switch, the sub valve closes and the back pressure rapidly closes the main valve piston.
When the water level drops below the set level, the sub valve opens releasing the back pressure allowing the main valve piston to open to refill the tank or pool. This system mechanically controls tank water level and requires no maintenance or electrical supply.