Pipelines use butterfly valves, a class of rotational motion valves with a quarter-turn, to stop the flow of fluid. Butterfly valves are frequently mentioned as having the ability to control flow. Oil flow control valves, commonly referred to as Sensitrol Valves or Micro Valves, are utilised in many types of burners. These are manual valves that act as tight shutdown valves and limiting orifices to control the oil-to-air ratio. burners before turning off. High quality gun metal and brass were used to make this. To extend the life of micro valves, the inside tips are toughened, ground, and lapped.