#regulator  any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
  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:  #aperture  a device that controls amount of light admitted
  subtype:  #ballcock__ball_cock  floating ball that controls level in a water tank
  subtype:  #draft.regulator  a regulator for controlling the flow of air in a fireplace
  subtype:  #faucet  a regulator for controlling the flow of a liquid from a reservoir
     subtype:  #mixing_faucet  single faucet for separate hot and cold water pipes
     subtype:  #stopcock__cock__turncock  faucet consisting of a rotating device for regulating flow of a liquid
     subtype:  #water_faucet__waterfaucet__water_tap__watertap__tap__spigot__hydrant  a faucet for drawing water from a pipe or cask
  subtype:  #flywheel  regulator consisting of a heavy wheel that stores kinetic energy and smoothes the operation of a reciprocating engine
  subtype:  #peg  regulator that can be turned to regulate the pitch of the strings of a stringed instrument
  subtype:  #petcock  regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining
  subtype:  #register.regulator  a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device
  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:  #sluicegate__sluice_valve__floodgate__penstock__head_gate__water_gate__watergate  regulator consisting of a valve or gate that controls the rate of water flow through a sluice
  subtype:  #thermostat__thermoregulator  a regulator for automatically regulating temperature by starting or stopping the supply of heat
     subtype:  #cryostat  a thermostat that operates at very low temperatures
     subtype:  #pyrostat  a thermostat that operates at very high temperatures

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