Dictionary
Words, grammatical forms and meanings linked to the ontology.
retaining valve en · NOUN
Meanings
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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).
Forms
Synonyms
retainer