The needle valve is a valve that can be adjusted accurately and has a wide range of uses, such as the cutting distance for flame cutting. The knob for adjusting the flame temperature is the needle valve. Instrument needle valve is an important part of the instrument measurement pipeline system. It mainly includes stop valves and ball valves. Its function is to open or cut off the pipeline passage. The valve core of the needle valve is a very pointed cone, which is inserted into the valve seat like a needle, hence the name.