Needle Valve Drawing

needle valve
A needle valve is a type of valve having a small port and a threaded, needle-shaped plunger. It allows precise regulation of flow, although it is generally only capable of relatively low flow rates.
Adjustment on a carburetor used to set proper fuel/air mixture. Some carburetors have separate needle adjustments for low and high throttle. Typically, turning the needle clockwise (screwing in) leans the mixture (less fuel), and vice versa.
A valve closed by a thin tapering part
This is used to tune the fuel to air mixture on the engine carburetor. On most engines, the needle is turned clockwise to lean the mixture, and counterclockwise to richen.

drawing
The art or skill or making such pictures or diagrams
A picture or diagram made with a pencil, pen, or crayon rather than paint, esp. one drawn in monochrome
The selection of a winner or winners in a lottery or raffle
the creation of artistic pictures or diagrams; "he learned drawing from his father"
an illustration that is drawn by hand and published in a book, magazine, or newspaper; "it is shown by the drawing in Fig. 7"
a representation of forms or objects on a surface by means of lines; "drawings of abstract forms"; "he did complicated pen-and-ink drawings like medieval miniatures"