How to correctly choose electric pneumatic valve type

at present, the commonly used in engineering control pneumatic valve is mainly: electromagnetic pneumatic and electric pneumatic valves. But they have defects in use, such as solenoid pneumatic valve easily by foreign bodies blocked, water resistance is big, must be long-term specialist maintenance, etc. ; And although there is no water resistance electric pneumatic valve, but due to the need to have the necessary control circuit, so that water vapor erosion prevention affect the service life is also the main problem in marketing.

locator design problem from the design of the original thinking, actuator and positioner design must be considered together. How to design a good locator? Knew from his important properties, must be a high gain device. The gain is composed of two parts: static gain and dynamic gain. To improve the static gain method is to design a preamplifier. Such as nozzle - - Baffle device. So have a friend to ask for dynamic gain? Generated by a power amplifier, the power amplifier is slippery pneumatic valve ( In general. Now someone has used the microprocessor to set the locator. It looks like after regulating pneumatic valve will talk tell us where he is broken. When doing maintenance is simple. Get to the point. At the same time has high static and dynamic gain high performance locator for pneumatic valve regulation of any given component provides lower process deviation degree of the best overall performance.
how to maximize the overcome scale effect on regulating pneumatic valve use
both solenoid pneumatic valve and electric pneumatic valve, scale not only can cause regulating pneumatic valve leakage, serious when even will affect the hardware to adjust the normal work of the pneumatic valve, so how to eliminate the influence of scale and issues of common concern to the personage inside course of study.
control pneumatic valve technology involves the range is too wide, can't give you say clear, here also hope this aspect of the content yourself to look up information. But in different design and the use of filler material actuator control pneumatic valve performance difference can be summed up its rule: there can make the dead area in the process, process variable deviates from the original set point. So the output of the controller must increase to enough to overcome dead zone, only the corrective action occurs. Main factors, which affect the dead area. Friction, shifting, pneumatic valve shaft torsional, amplifier dead zone. Various control pneumatic valve is sensitive to the friction is different, such as rotary pneumatic valve for pneumatic valve seat by the high load caused by the friction force is very sensitive, so take note when using. But for some seal type, high pneumatic seat load is necessary in order to obtain close ranks. Ha ha, so, the pneumatic valve designed is very bad, easy to cause a lot of dead zone, the impact on the process of the deviation degree is obvious, it is decisive. (2) the wear and tear. Regulating pneumatic valve wear during normal use is inevitable, but the lubrication layer of wear is the most powerful, according to our experiments confirmed that the lubrication rotary pneumatic valve action only after a few hundred cycles, lubrication layer can be used just brush (almost Exaggeration, writing an article or depressed. Additional stress caused by load can also lead to seal layer of wear, these are the main factors lead to friction increases. The result? Is to control the performance of the pneumatic valve in devastating! (3), packing friction is the main source of friction control pneumatic valve, the use of packing is different, there's a big difference caused by friction. (4), the type of actuator is different also has a fundamental influence on the friction, in general spring thin film actuator is better than piston actuator.