Pneumatic diaphragm regulating pneumatic valve selection skills recommended

While selecting a pneumatic diaphragm regulating pneumatic valve, puzzled how many technical personnel, should not only consider the performance, also want to concern to the price problem. So while selecting a pneumatic diaphragm regulating pneumatic valve, how to choose to give attention to two or morethings arrives above those problems? Today, pneumatic diaphragm regulating pneumatic valve selection problem, small make up recommend a few selection technique for your reference.





a, according to the working condition of type
pneumatic diaphragm regulating pneumatic valve by pneumatic valve and pneumatic diaphragm actuator of two parts, according to the pneumatic valve body structure classification, pneumatic diaphragm regulating pneumatic valve can be divided into direct single-seat pneumatic valve, two-seat regulating pneumatic valve, pneumatic valve and pressure Angle adjustment in accordance with the requirements of site condition, optional roughly determine the choice of the structure of the pneumatic valve adjustment.








2, according to security selection
usual pneumatic diaphragm regulating faintly pneumatic valve pneumatic valve and open her breath valve in two forms. According to the requirements of different production process, to be interrupted when the signal pressure regulating pneumatic valve is in open or closed position, to process the harmfulness caused by size. If less harmful when the pneumatic valve in the closed position, choose gas drive pneumatic valve, pressure signal is interrupted, make regulating pneumatic valve in the closed position, on the contrary, choose air breath valve. Also, according to the pressure to select is greater than the actual pressure value when using at least one standard grades of nominal pressure pneumatic valve body.








3, according to the flow characteristic selection
in the design of the automatic control system in the process of choosing pneumatic diaphragm regulating pneumatic valve flow characteristics should be considered. The properties of the ideal typical linear flow characteristics, such as percentage flow characteristics ( Logarithmic flow characteristic) , quick opening four flow characteristic and parabolic flow characteristics.








4, regulate the choice of pneumatic valve diameter
should be based on the known fluid required to calculate the flow coefficient CV value, then according to the product technical parameter table to select suitable regulating pneumatic valve diameter. When calculating the CV value must pay attention to the liquid, gas, water vapor and other difference of steam.





5, according to the medium category selection


different media for the pneumatic valve body structure, the material also is not the same, while selecting a pneumatic diaphragm regulating pneumatic valve, factors such as temperature, corrosive medium also decides the selection of pneumatic valve body material, conventional pneumatic valve WCB material, can be used for a variety of working condition of weak corrosive medium, such as water, air, oil, etc. Has a strong corrosive medium, you may need to consider using stainless steel material pneumatic valve body, plastic material, glass fiber reinforced plastic material or metal lining material ( Such as fluorine plastic, rubber, etc. ) 。


the above a few pneumatic diaphragm regulating pneumatic valve selection technique, is derived from the model selection of the actual experience sharing, there are shortcomings of welcome to supplement and correct.