#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

No statement uses or specializes valve; click here to add one.