Choke Valves are valves that lift a solid cylinder up and down which is placed around or inside another cylinder, which has, holes or slots. The design of a choke valve means fluids flowing through the cage are coming from all sides and that the streams of flow collide with each other at the center of the cage cylinder, thereby dissipating the energy of the fluid through flow impingement. The main advantage of choke valves is that they can be designed to be totally linear in their flow rate. Heavy-duty industrial choke valves are used in the oil industry and for highly erosive and corrosive purposes. Choke valves are important for carbureted gasoline engines because small droplets of gasoline do not evaporate well within a cold engine.