Control valve, also known as control valve, by adjusting the control unit to receive the control signal output, with the help of power to change the fluid flow. Regulating valve generally by the implementing agencies and valves. If you press the actuator used by its power, the control valve can be divided into pneumatic control valve, electric control valve, hydraulic control valve three, that compressed air as the power source pneumatic control valve to electric power source of electric Control valve, liquid medium (such as oil, etc.) pressure-powered electro-hydraulic valve, in addition, according to their functions and characteristics of points, linear characteristics, such as percentage characteristics and parabolic characteristics of three. Field bus-type control valve. There are many types of valve body, commonly used body types through a single seat, through two-seater, angular, diaphragm, small flow, tee, eccentric rotation, butterfly, sleeve, spherical and so on. In the specific choice, the following considerations can be made: (1) The shape of the valve spool is mainly based on the selected flow characteristics and unbalanced forces and other factors to consider. (2) Abrasion resistance When the fluid medium is a suspension containing high concentration of abrasive particles, the internal material of the valve should be rigid. (3) Corrosion resistance As the media is corrosive, try to choose a simple structure of the valve. (4) Medium temperature, pressure When the medium temperature, high pressure and changes, should use the valve core and valve seat material by temperature, pressure changes in small valves. (5) to prevent flash and cavitation flash and cavitation only produce liquid medium. In the actual production process, flash and cavitation will form vibration and noise, shorten the life of the valve, so the valve should be selected to prevent flash and cavitation.
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