Float valves are used primarily in surge tanks to self-regulate flow.  When high bather loads create displaced water or a surge, commonly found in competition and large body pools, the surge tank handles the overflow.  The concept is a balance which influences the water level in the tank (also known as the surge pit).  The more the difference, the more the water wants to rush from the pools bottom outlet (main drain).  If this flow exceeds the pumps needs, it will flow into and begin to fill the pit.  As the water level rises in the pit from this additional surge, the pressure diminishes demanding less flow from the main drain pipe.  The equilibrium is established and the water stops rising in the pit and the flow is controlled to the flow rate that the pump is designed for.  The float valve raises allowing water to enter the pit in surge conditions and lowers when the water level is modulated.

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