Several issues to consider in choosing pneumatic control valve

Pneumatic control valve of the valve body is a lot of more phyletic, the commonly used types of the body is through single-seat, direct two-seater, angular, diaphragm, small flow rate, tee, eccentric rotating, butterfly, sleeve, spherical, etc. In order to make the pneumatic - valve to work properly, with the implementation of the mechanism to produce enough output force to guarantee high sealing and opening of the valve. In specific choices, to do the following: ( 1) Mainly based on the selected valve core shape of flow characteristic and factors such as unbalanced force. ( 2) Wear resistance when fluid medium is suspending liquid containing high concentrations of wear particles, the interior of the valve material is hard. ( 3) Corrosion resistance due to the corrosive medium, to choose structure simple valves. ( 4) The medium temperature, pressure, when the medium temperature, high pressure and large, should choose the valve core and valve seat materials by temperature, pressure changes small valves, should add the radiator when the temperature is 250 ℃ or higher. ( 5) Prevent flash flash and cavitation and cavitation produced only in a liquid medium. In actual production process, flash and cavitation will form the vibration and noise, shorten the service life of the valve, therefore when selecting valves should prevent the valve from flash and cavitation.