Pneumatic control valve flow characteristic

Pneumatic control valve flow characteristics choose pneumatic control valve is mainly divided into two major categories of electric pneumatic control valve and pneumatic pneumatic control valve. Pneumatic control valve flow characteristics, it is to point to in under the regulation of differential pressure constant on both ends of the valve, the medium flows through the pneumatic control valve of the relationship between relative flow and its opening. Pneumatic control valve flow characteristics have a linear features, such as percentage and parabolic characteristics of three. The meaning of three kinds of injection flow characteristic is as follows: 1. Percentage of features, Logarithmic) Percentage of properties such as: the relative stroke 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, part of changing flow ratio 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) : the 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, parabolic features: two proportional to change flow according to the schedule, with linear and roughly equal percentage in the middle of the properties. Electric pneumatic regulator daily small problem of electric pneumatic - valve servo amplifier normal working state is likely to have the following three conditions: ( 1) No input signal, the output voltage not to be. （ 2) Open loop dead zone current & le; 160μ 一个( Ⅱ type for 100 & mu; 一) 。 （ 3) The input signal of > 240 & mu; 一个( Ⅱ type for 150 & mu; 一) When the output load voltage for? 205～220V? AC。 （ 4) Basic symmetric output voltage.