throttle valve

noun
a valve for throttling the working fluid of an engine, refrigerator, etc.

Origin:
1805–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To throttle valve
Example sentences
The throttle control failure caused the astern throttle valve to fully open,
  resulting in increased steam flow.
Both the needle valve and the throttle valve are used to adjust the gas
  pressure in the source.
Speed or power is then changed by signals to the throttle valve through a
  governor or actuator.
Repeated throttle valve adjustments have not been successful in stopping the
  valve closures.
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