regulator

nouns

any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
regulator
is derived from
regulate
is a type of (narrower)
a mechanism that controls the operation of a machine
"the speed controller on his turntable was not working properly"; "I turned the controls over to her"
control, controller
an official responsible for control and supervision of a particular activity or area of public interest
regulator
is derived from
regulate
is a type of (narrower)
a worker who holds or is invested with an office
functionary, official
a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
governor, regulator