Pneumatic control valve error verification method
1. Pneumatic control valve Basic error verification
The specified input signal is input actuator (or positioner) steadily in the direction of increasing or decreasing, the corresponding stroke value of each point is measured, and the error of each point between the actual “signal-stroke” relationship and the theoretical relationship is calculated, and the maximum value is the basic error.
2. Pneumatic control valve return difference verification
The maximum difference between positive and negative travel measured on the same input signal is the return difference.
3. Pneumatic control valveConsistent deviation verification
Consistent deviation method is the same as 1. The basic error at the off-line of the signal is the starting point deviation, and the basic error at the line of the signal is the terminal deviation.
