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drop valve

American  

noun

  1. a valve, as for a steam engine, that drops freely to close.

Example Sentences

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The drop valve is now displacing the slide valve as a better form of excluding or admitting steam.

From James Watt by Carnegie, Andrew

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.