sleeve valve

sleeve valve

noun
an intake or exhaust valve for an engine, consisting of one or more sleeves reciprocating within a cylinder, so that ports in the cylinder and in the sleeves are opposed at regular intervals to open the valve.

Origin:
1910–15

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Collins
World English Dictionary
sleeve valve
 
n
(in an internal-combustion engine) a valve in the form of a thin steel sleeve fitted between the cylinder and piston and having a reciprocating and rotary oscillation movement

Collins English Dictionary - Complete & Unabridged 10th Edition
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