float valve

noun
a valve admitting or discharging a liquid to or from a tank and regulated by a float on the surface of the liquid within the tank to maintain a nearly constant height of liquid.

Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Evaporator compartment is equipped with evaporator, water pump, float valve and
  water level sensor probe.
Ball-float valve with the ball at the bottom of the cage and the vent line open.
Evaporator compartment is equipped with evaporator, water pump float valve and
  sensor probe.
Recirculation of the effluent can also be achieved using a ball float valve
  that is installed in the recirculation tank.
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