The SGON Cast Steel Needle Valves is a kind of valve that can be precisely adjusted. It is widely used. For example, the cutting distance of flame cutting, the knob of adjusting the flame temperature is the needle valve. Instrument needle valve is an important part of instrument measuring piping system. It mainly consists of globe valve and ball valve. Its function is to open or cut off pipeline passages. The spool of the needle valve is a very sharp cone, like the needle inserted into the valve seat.