Features of the pneumatic knife type gate valves-jlsvalve.com

Features of the pneumatic knife type gate valves

Pneumatic knife type gate valve is the use of pneumatic actuator control valve, so as to achieve the opening and closing of a valve valve. It can be divided into two parts, the upper part of the pneumatic actuator, the lower part of the valve.
Pneumatic knife gate valve factory price from the 1980s into China. In less than 20 years, the scope of its use from the general field to a broader range of industries. Coal preparation, gangue discharge and slag discharge from mining and power plant. Developed to urban sewage treatment, from the general industrial pipeline to food, health, medicine and other professional pipeline system. Ultra-thin knife 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 Knife type gate valves have been replaced by a large number of universal cut-off and regulating valves. Today, the world's largest use of knife gate valves is the United States and Japan.


The opening and closing parts of the cast steel pneumatic knife type gate valve are the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. Gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces form wedge, wedge Angle with the valve parameters, usually 50, wedge knife gate valve gate can be made as a whole, called the rigid gate; Also can type pneumatic knife gate valve can produce a small deformation of the ram, and to improve its manufacturability, make up for the sealing surface Angle in the process of our processing deviation, the gate is called elastic disc type knife gate 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 seal face seal, this is the seal. Most type knife gate valve is made mandatory sealing, the valve is closed, to rely on outside force forced the ram pressure to the valve seat, to ensure the sealing surface sealing of the stainless steel pneumatic knife type gate valve.


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