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Meaning of needle valve

nee'dle valve"

Pronunciation: [key]
— Mach. Mach.
  1. a valve with a needlelike part, a fine adjustment, or a small opening, esp. a valve in which the opening is controlled by a needlelike or conical point that fits into a conical seat.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.