Webster's Revised Unabridged Dictionary · 1913

Pilot valve

Pilot valve

(Hydraulics) A small hand-operated valve to admit liquid to operate a valve difficult to turn by hand.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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