Knife gate valves mainly rely on the blade-shaped gates to cut off media. The fluid resistance of knife gate valves is small because the flow direction of media will not be changed with the direct medium channels in valve bodies. As the movement of gates is perpendicular to the direction of media in the open/close operation, knife gate valves own small torque and are labor-saving compared to globe valves. And media are not restricted in the flow directions, which can flow from both sides of knife gate valves in any direction to achieve the purpose of applying. Knife gate valves are suitable for situations with viscous particles and are often used in beverage, paper making, pulp, industrial sewage, urban sewage treatment, chemical plant, bulk material transportation and other industries.