#valve  control consisting of a mechanical device for controlling the flow of a fluid
  supertype:  #controller__control  a mechanism that controls the operation of a machine; "the speed control on his turntable was not working properly"; "I turned the controls over to her"
  part:  #handwheel  #handwheel.wheel
  subtype:  #throttle__accelerator__throttle_valve  a valve that regulates the supply of fuel to the engine
  subtype:  #ball_valve  any valve that checks flow by the seating of a ball
  subtype:  #butterfly_valve__butterflyvalve  a valve in a carburetor that consists of a disc that turns and acts as a throttle
  subtype:  #choke  a valve that controls the flow of air into the carburetor of a gasoline engine
     subtype:  #automatic_choke  a choke that automatically controls the flow of air to the carburetor
  subtype:  #clack_valve__clackvalve__clack__clapper_valve__clappervalve  a simple valve with a hinge on one side; allows fluid to flow in only one direction
  subtype:  #exhaust_valve__exhaustvalve  a valve through which burned gases from a cylinder escape into the exhaust manifold
  subtype:  #intake_valve  a valve that controls the flow of fluid through an intake
  subtype:  #poppet_valve__poppet  a mushroom-shaped valve that rises perpendicular from its seat; commonly used in internal-combustion engines
  subtype:  #safety_valve__relief_valve__escape_valve__escape_cock__escape  a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
  subtype:  #slide_valve__slidevalve  valve that opens and closes a passageway by sliding over a port

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