Lap 1


Lap 1 : (1) The amount by which a slide valve overlaps the steam port when the valve is in mid position; steam (or outside) lap refers to the admission side and exhaust (or inside) lap refers to the exhaust side. (2) The extent to which plates in engineering or tiles in building overlap one another. (3) To finish turned metal work to fine limits by the use of tools of softer metal and an abrasive powder
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