Knife gate valve opening and closing pieces are, the movement direction of the gate perpendicular to the direction of the fluid, manual knife gate valve can be fully open and fully closed, can not be adjusted and the throttle. There are two gate sealing surface, the most common mode gate valve sealing surface to form two wedge-shaped, wedge-shaped angle with the valve parameters vary, usually 50, wedge knife gate valve can be made into a whole , called the rigid gate; can also be made to produce small quantities of the deformation of the gate in order to improve their craft, make up the sealing surface angle in the process deviations from this gate is called the flexible gate knife gate valve is closed , the sealing surface can only rely on media pressure to seal, which rely on the media pressure will gate sealing surface 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 used to force sealed, that the valve is closed, to rely on external pressure to force the gate to the seat, in order to ensure the sealing surface of sealing the valve in the pipe in the general category should be installed horizontally. Knife gate valve drive: manual, electric, pneumatic, hydraulic, bevel gear, electric hydraulic and gas-liquid moving, etc.-driven approach. Knife gate valve shape: the next shot, dark bar two; knife gate valve Material: cast iron, cast steel, carbon steel, stainless steel, fluorine, etc.; knife gate valve seal: seal, soft seal, single seal, sealed on both sides and other sealing materials. 
 Entering the country from the eighties. In less than two years time, its use expanded from the general to a wider field of industries. Coal from the mine plant, row gangue, slag. Development to the city's sewage treatment, industrial pipes from the general development of the food, health, medicine and other professional pipeline system. Thin knife gate valve with its small size, small flow resistance, light weight, easy to install and remove the advantages of a thorough solution to a common valve, flat gate valve, ball valve, globe valve, control valve, butterfly valve type door big flow resistance, weight, installation is difficult, and large area of ??difficult problems. Knife gate appears, cut class a lot of common valves and regulating valves have been the replacement. Today, global knife gate valve is the largest amount the United States and Japan. 
 Shanghai Tang Yang knife gate valve products are: electric knife gate valve, knife gate valve sprocket, pneumatic knife gate valve, bevel gear knife gate valve, manual knife gate valve, ceramic knife gate valve, etc. .