Knife-type gate valve has the advantages of simple and compact structure, reasonable design, light materials, reliable sealing, light and flexible operation, small size, smooth passage, small flow resistance, light weight, easy installation, easy disassembly and other advantages. Gate valves, globe valves, regulating valves, butterfly valves, ball valves and other valves of heavy weight, large flow resistance, large area, difficult to install and other difficult problems, can replace the common cut-off valve and control valve, the working pressure of 1.0MPa-2.5MPa, Temperature -29-550 ℃ under normal circumstances. Knife gate knife gate has a shear function, scraping the sealing surface of the adhesive, automatically remove debris, stainless steel gate to prevent corrosion caused by the seal leak.