Technique 3) pneumatic control valve selection

first, the choice of control pneumatic valve
at present, the main use is commonly used in the project control pneumatic valves are: electromagnetic pneumatic and electric pneumatic valves. But their defects in use, such as solenoid pneumatic valve easy to jam, hand is the long-term maintenance, water resistance and water though, but because of the demand for the necessary control circuit, therefore, the life of the erosion resistance of steam electric pneumatic valve, is also the main problem in promotion.
2, how to maximize the pneumatic valve to overcome the influence of size
in any electric solenoid pneumatic valve, pneumatic valve size will not only cause leakage, serious and even affect the normal operation of the pneumatic valve, so how to eliminate the scale effect, is a common concern of the industry. Process control range of pneumatic valve is too large, you can't remove them here, I hope this information is information, look at yourself. However, due to the design and different filler material or poor performance, by the pneumatic control valve, can be summarized its own rules of actuators are used: and in the process of the process variables of death there will deviate from the original set point. As a result, the output of the controller must raise enough to overcome dead zone, only the corrective action will happen. , (1) the main factors that affect the dead zone. Friction, stroll, pneumatic valve spindle rotation, the amplifier is dead. In friction with kinds of control pneumatic valve is not the same as sensitive, such as high load caused by friction spinning pneumatic valve seat is very sensitive, so the instructions. But for some seal type, high load seat closed, in order to obtain the necessary results. This pneumatic valve design is very poor, therefore, it is easy to cause the dead zone, this is the process of variation is obvious, only is decisive. (2) the wear and tear. In normal use, pneumatic valve wear is inevitable, but the wear of lubrication is one of the most powerful. In addition, the load can lead to irritability seal wear, these are the main factors that lead to growing friction. The result is a pneumatic control valve (3) the damaging effects of performance, control pneumatic valve fill the friction is the main source of friction, different filler used, friction caused a big difference. (4), to the implementation of the different types of institutions also has a basic friction effects, generally speaking, the spring thin film actuator is better than piston actuator.
the third, the locator design problems
the author from the design, actuators and locator design preliminary idea and must be taken into consideration. How to design a good location? He must know important feature, is a high gain device. Gain is consists of two parts: static gain and dynamic gain. The static gain improvement method is to design a preamplifier. For example, the nozzle - Baffle device. Later, the friend asked how to get dynamic gain? Generated by power amplifier, it is a slippery pneumatic valve power amplifier ( General) 。 The static and high gain, high performance of any change in the process of pneumatic valve components with high dynamic positioning reduced the comprehensive performance of the best degree.