When selecting pneumatic - valve matters needing attention

Pneumatic control valve and control valve, by accepting conditioning control unit of the output control signal, from engine operation to change fluid flow. Pneumatic valve and valve general, the executing agency. If by their ticket enforcement agencies use the power, pneumatic control valve pneumatic control valve can be divided into pneumatic, electric pneumatic control valve, hydraulic pneumatic regulator three, in addition, according to its function and feature points of linear features, such as percentage and parabolic characteristics of three. 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 the concrete selecting pneumatic control valve, to do the following to consider: ( 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, when the temperature & ge; 250 ℃ should add the radiator. ( 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.