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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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Excess pressures are taken out by slide valve control which also dampens the transfer of pressure surges between vessels.
Requires six detent flow positions with a patented turbulence-free slide valve for operator flow control.
The leak was isolated by closing the commode slide valve.
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