The knife gate has the function of cutting off the medium, so that the valve can be closed without being blocked by the medium. This valve is generally used to open and close the circulation of pulp, coal ash, chemical raw materials, sewage, food and other media. The pressure range is generally within 1.6MPa, the temperature is generally below 120℃, and special materials can be used instead of high temperature. The valve has the obvious advantages of light switch, reliable seal, good elastic memory and long service life. It can be widely used as regulating and intercepting devices in the pipelines of tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electric power, ships, metallurgy, energy systems and so on.