The deadline valve is suitable for cutting or adjustment and throwing. Because the valve stems of this type of valve are relatively short, and they have a very reliable cutting function, and due to the changes in the valve seat pass and the stroke of the valve petals, it is very suitable for adjusting the flow. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.