Slide-valve

slide valve

noun Machinery.
a valve that slides without lifting to open or close an aperture, as the valves of the ports in the cylinders of certain steam engines.

Origin:
1795–1805

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
slide valve
 
n
1.  a valve that slides across an aperture to expose the port or opening
2.  (modifier) fitted with slide valves: a slide-valve engine

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