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Tappet motion

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Tappet \Tap"pet\, n. (Mach.)
   A lever or projection moved by some other piece, as a cam, or
   intended to tap or touch something else, with a view to
   produce change or regulate motion. --G. Francis.

   {Tappet motion}, a valve motion worked by tappets from a
      reciprocating part, without an eccentric or cam, -- used
      in steam pumps, etc.
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