self-lapping

形容词 adj.

英文释义

形容词 adj.
  1. Of a valve, especially for brakes, maintaining the force of pressure selected by a control. not-comparable
    — [...] Mr. Grierson remarks that on the L.P.T.B. tube stock in general the electro-pneumatic brake is in use, but that the new 1938 stock is fitted with the self-lapping electro-pneumatic brake, which is under the control of an automatic mercury-operated retardation controller when normal service stops are being made.

词源

From self- + lapping.
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