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Slide valve
The slide valve is a rectilinear valve used to control the admission of steam into, and emission of exhaust from, the cylinder of a steam engine.
==Use==
In the 19th century, most steam locomotives used slide valves to control the flow of steam into and out of the cylinders. In the 20th century, slide valves were gradually superseded by piston valves, particularly in engines using superheated steam. There were two reasons for this:
* With piston valves, the steam passages can be made shorter. This reduces resistance to the flow of steam and improves efficiency.
* It is difficult to lubricate slide valves adequately in the presence of superheated steam.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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