What is the function of the plate positioner?
36.6 Positioning Positioners The main purpose of having a positioner is to guarantee that the valve does in fact move to the position that corresponds to the value of the controller output.
How do you calibrate the positioner on a control valve?
An Overview of Step-by-Step Calibration of Control Valve Positioner
- The measurable pressure range is shown on the supply gauge.
- Set the input value to the lowest reading value.
- Further slowly adjust the nozzle pin to get zero value.
- Then slowly increase the input pressure value to 3psi, and check if you get zero output.
What does stroking a valve mean?
In valve stroking, a pneumatic signal that represents the throttling range of the valve is applied to the actuator. Typically, this is an air pressure signal of 3 to 15psig.
How do you calibrate a valve control?
Check the manual operation of the valve using the hand wheel. Stroke the valve either from local or from DCS as applicable. Confirm the valve travel from local. Calibrate the Valve with the inbuilt option like “Auto Calibration” available in the valve positioner.
How do you calibrate a control valve?
- Take the work permit from shift in-charge.
- Checking for valve accessories any damage for DVC feed back, guage, air regulator and filter.
- Check the pressure regulator guage and set it according to bench set.
- Check the positioner cam alignment ,cam alignment should be matched with travel length.
How do you check a valve for a stroke?
Control Valve Stroke Test Procedure
- Assume the valve is a 4-20mA operated pneumatic valve.
- Connect the universal calibrator (or source) to the input of the valve.
- Connect the multimeter at the valve position feedback output as shown in above the setup figure.