Three kinds of flow characteristic of electric pneumatic control valve

Electric pneumatic control valve is an important execution units in industrial automation process control instrumentation. As more and more high degree of automation, in the field of industrial electric pneumatic regulator is being more and more application in the field of all kinds of industrial production. Electric pneumatic control valve generally includes drive, receive the drive signal ( 0 - 10 v or 4 - 20MA） Adjusted to control the valve, can also according to the need of control, intelligent network control system, optimization control to realize remote monitoring. Electric pneumatic control valve flow characteristics have a linear features, such as percentage of properties and characteristics of parabola three: ( 1) Such as percentage of features, Logarithmic) Percentage characteristics such as relative trip and no linear relationship between relative flow in the process of every point unit running change caused by the flow of change is proportional to the flow of this point, the percentage of the flow rate change is equal. So it has the advantage of traffic hours, changing flow is small, large flow, the flow rate change is big, is also on the different opening, has the same accuracy. （ 2) Linear features, Linear) Linear characteristic of relative stroke and the relative flow into a linear relationship. Unit trip caused by the changes in the flow rate change is constant. Large flow, the flow relative changes little, traffic hours, flow relative change is big. （ 3) Electric pneumatic regulator parabola changes flow according to the schedule of two proportional to their general with linear and percentage in the middle of the properties, etc. Can be seen from the analysis of the above three kinds of characteristic, electric pneumatic - valve adjusting performance, characteristics such as percentage, for optimal, the control stability, good regulation performance. And parabolic characteristics than the linear characteristic of regulating performance is good, can according to the requirement of the application, choose any of them a flow characteristic.