#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"
  subtype:  #throttle  #ball_valve  #butterfly_valve  #choke  #clack_valve  #exhaust_valve  #intake_valve  #poppet_valve  #safety_valve  #slide_valve
  part:  #handwheel  control consisting of a wheel whose rim serves as the handle by which a part is operated
  part:  #handwheel.wheel  a wheel worked by hand

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