WordReference Random House Unabridged Dictionary of American English © 2025
ball′ valve′, [Mach.]
  1. Mechanical Engineeringa valve controlling flow by means of a ball pierced with an opening in one direction and fixed to rotate on a spindle at right angles to the opening.
  2. Mechanical Engineering, Hydraulicsany valve that checks flow by the seating of a ball.
  • 1830–40


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