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poppet valve. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Noun
poppet valve (plural poppet valves)
- (mechanics) A valve (as in an internal combustion engine) which consists of a sliding shaft with a disk on the end (the disk being shaped to alternately plug and unplug a matching port) and which is operated by springs and possibly cams interacting with the shaft.
1900, Patents for Inventions: Abridgments of Specifications, page 75:This communication between the tank and pump is controlled by a float valve in the tanks and a cock in the pipe, while a poppet valve prevents the undrawn liquor going into the waste tank.
1959, David P. Morgan, editor, Steam's Finest Hour, Kalmbach Publishing Co., page 62:Chesapeake & Ohio's enormous L-2 4-6-4's with Franklin rotary-cam poppet valves boasted an engine weight of 221½ tons and were coal-minded Chessie's last bid to beat the passenger diesel with a reciprocating engine.