Definitions for d valve
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Wiktionary
D valve(Noun)
A slide valve with a cup-like cavity in its face, through which exhaust steam passes.
Origin: Named after the hollow central D-sectioned piston.
Webster Dictionary
D valve(u)
a kind of slide valve. See Slide valve, under Slide
Citation
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"d valve." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/d valve>.

