Definitions from Wiktionary (retaining valve)
▸ noun: (rail transport, mechanical engineering) 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).
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▸ noun: (rail transport, mechanical engineering) 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).
Similar:
check valve,
non-return valve,
one-way valve,
rack,
retainer,
unfading,
clasping,
dam,
hard,
keep,
more...
Opposite:
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▸ Usage examples for retaining valve
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▸ Wikipedia articles (New!)
▸ Words that often appear near retaining valve
▸ Rhymes of retaining valve
▸ Invented words related to retaining valve