When axial check valve is closed, sealing surface can only rely on medium pressure to seal, that depend on medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the sealing surface sealing, it is the seal, most is adopt compulsory seal gate valve, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing. Valves of this class shall generally be installed vertically in piping.
Driving mode of the cast steel pneumatic knife type gate valve : manual, sprocket, electric, pneumatic, hydraulic, bevel gear, electric control hydraulic and pneumatic driving mode. Knife-type gate valve shape: bright rod, dark rod two kinds. Knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, fluorine, etc.
Seal of the pneumatic knife gate valve factory price: hard seal, soft seal, single seal, double seal and other materials seal.
Ultra-thin knife type gate valve with its small size, small flow resistance, light weight, easy to install, easy to disassemble and other advantages completely solve the common gate valve, plate gate valve, ball valve, globe valve, regulating valve, butterfly valve and other valve flow resistance, heavy weight, difficult to install, large area and other difficult problems. Knife gate valves have been replaced by a large number of universal cut-off and regulating valves. The world's largest use of knife gate valves is the United States and Japan.
 The service range of pneumatic knife type gate valve is:
1. Mining, coal washing and iron and steel industry -- used for coal washing pipelines, filter slurry pipelines and ash discharge pipelines;
2. Purification device -- used for waste water, mud, dirt and clarified water with suspended matter;
3. Papermaking industry -- used for any concentration of pulp, mixture of materials and water;
4. Power station deashing -- used for ash slurry.