The final
lever operated butterfly valve in India. In operation, the valve is completely open or closed while the disc is turned around 1 / 4 turn. The "butterfly" is a steel disc established on a rod. When the valve is closed, the disc is formed in order that it absolutely blocks off the passageway. The valve can also be opened incrementally to throttle float.
The automobile fuel pedal uses this valve to control the air that comes in from the outdoors through air filters. When the gas pedal is fully pressed to the ground, the valve opens absolutely, permits the air to return into the carburetor. The air blends with the gasoline, enters into the combustion chamber where they're ignited.