Needle valve is a valve that can be accurately adjusted, and has a wide range of uses, such as the cutting distance for flame cutting, and the knob for adjusting the flame temperature is a needle valve. Instrument needle valve is an important part of the instrument measurement pipeline system, mainly has the globe valve and the ball valve, its function is to open or cut off the pipeline path. Needle valve spool is a very sharp cone, like a needle inserted into the seat, hence the name.