There are many types of regulating valve body, commonly used 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 Due to the media 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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