Action mode: power on/ power off
Power on: when there is no signal current, valve closed, as the increasing of signal current from 4—20mA (0—10mA), valve board slowly open
Power off: when there is no signal current, valve open, as the increasing of signal current from 4—20mA (0—10mA), valve board slowly close
Normal condition, users did not request, the valve is produced with power on 4—20mA (0—10mA)
Action principle: current from operator, get into electric actuator, make it output a corresponding corner, drive connecting rod, crank , rotate the valve board. As rotary valve board change the flow section, control the media flow and pressure
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