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Here are the steps to calibrate a pneumatic
actuator valve for optimal performance:
Preparation: Ensure the valve is installed
correctly and the pneumatic actuator is connected properly. Check the air
supply system to make sure it provides stable pressure and clean air.
Zero - point calibration: With the valve in
the closed position, adjust the zero - point of the positioner or controller.
This is usually done by setting the output signal of the controller to the
minimum value that corresponds to the closed - valve position.
Full - scale calibration: Supply the
maximum air pressure to the actuator to open the valve fully. Then, adjust the
full - scale setting of the positioner or controller so that the valve reaches
its maximum opening position as indicated by the process requirements.
Intermediate - point calibration: Check and
adjust the valve position at several intermediate points between the fully
closed and fully open positions. This ensures that the valve responds
accurately and linearly to the control signals within its entire operating
range.
Fine - tuning: Observe the valve's
performance during actual operation and make any necessary fine - tuning
adjustments to optimize its response time, accuracy, and stability.
Documentation: Record all the calibration
settings and results for future reference and maintenance.
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