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float valve

noun
  1. 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.
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Origin of float valve

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for float valve

Historical Examples

  • Near each filling-up tun O is a small cistern t communicating with the tun O by a pipe, which is closed by a float-valve.

    A Dictionary of Arts, Manufactures and Mines

    Andrew Ure