English Explanatory Dictionary

retaining valve

English dictionary entry

Meanings

noun
  1. A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway).

Word forms

retaining valve retaining valves

Synonyms

retainer
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