Knife gate valve - also known as knife gate valve, knife type slurry valve, from the 1980s into China. In less than two decades, its use has spread from the common to a wider range of industries. Coal preparation, gangue discharge and slag discharge from mine power plant. Development to urban sewage treatment, from the general industrial pipeline to the development of food, health, medicine and other professional pipeline system. Ultra-thin knife gate valve with its small volume, small flow resistance, light weight, easy to install, easy to disassemble and other advantages of the general gate valve, plate gate valve, ball valve, globe valve, regulating valve, electric butterfly valve valve class of valve flow resistance, large weight, difficult to install, large floor area and other difficult problems. After the emergence of knife gate valves, a large number of universal cut-off valves and regulating valves have been replaced.