self-lapping

Definitions

Of a valve, especially for brakes, maintaining the force of pressure selected by a control.

not-comparable

Examples

“[...] 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.”

“Thus, in the newer locomotives for the Great Northern line, the Woodward governors are adapted for air (not solenoid) control⟳ and continuous engine speed⟳ control⟳ through a self-lapping valve replaces the individual-speed steps, allowing operation in multiple with English Electric and Birmingham diesels.”

CEFR level