triple valve

English

Noun

triple valve (plural triple valves)

  1. (rail transport) In railway air braking systems, a valve that performs three functions.
    • 1964 March, “Train braking - the next steps”, in Modern Railways, page 186:
      The basic equipment on each vehicle consists of the auxiliary reservoir, the triple valve and the brake cylinders. When the train pipe pressure is reduced, the triple valve spills air out of the auxiliary reservoir until its pressure becomes equal to that of the train pipe; this air is passed into the brake cylinders.
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