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.

1795–1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slide valve
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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