The knife gate valve opening and closing parts of the ram, the ram direction of motion perpendicular to the direction of flow, manual knife gate valve can only be fully open and fully closed, can not be adjusted and throttle. Gate two sealing surface, the most common mode of gate valve sealing surface formed two wedge-shaped wedge angle with the valve parameters, usually 50, the wedge type knife gate valve can be made into a whole , called the rigid gate; can also be made to produce small deformation of the gate, in order to improve their craft, to make up for the sealing surface angle deviation in the process, this gate is called the flexible gate type knife gate valve is closed the sealing surface can only rely on media pressure to seal, to rely on media pressure on the sealing surface of the ram pressure to the other side of the seat to ensure the sealing surface of the seal, which is self-sealing most of the knife gate valve is the adoption of compulsory sealed, the valve is closed, we must rely on external force to ram pressure to the valve seat to ensure that the sealing surface of the sealing valve in the pipe shall generally be horizontal mounting. Knife gate valve drive mode: manual, electric, pneumatic, hydraulic, bevel gear, electrical hydraulic and gas-liquid moving, etc.-driven approach. Knife gate valve shape: the next shot, the dark bar of two kinds; knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, lined, etc.; knife gate valve seal: seal, soft seal, single-sided seal. a variety of materials such as double-sided sealing seal. 
 From the 1980s, entering the country. In less than two decades, the scope of its expansion from the common areas to the broader walks of life. Coal from the mine plant to discharge refuse, slag. Development to the city's sewage treatment, food, health, medicine and other professional pipeline system from the general industrial pipe. The advantages of ultra-thin knife gate valve with its small size, small flow resistance, light weight, easy to install, easy to disassemble completely solved the ordinary valve, flat gate valve, ball valve, globe valve, regulating valve, butterfly valves, and other class valve the flow resistance of the gate, heavy, difficult to install, covers an area difficult. After the emergence of the knife gate valve, a large number of common cut class valves and regulating valve has been replaced by the Today, the maximum global amount of knife gate is the United States and Japan. 
 Shanghai Tang Yang, knife gate valve products are: Electric knife gate valve, the sprocket knife gate valve, pneumatic knife gate valve, bevel gear cutter valve, manual knife gate valve, ceramic knife gate valve, etc. .