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what is the basic working principle of I/P and Positioner in
any control valve.
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Answer Posted / ashok polampalli
I/P Converter , converts 4-20 mA signal from controller
to .2 to 1.0 Kg/cm2 pneumatic signal.
Positioner consist of air supply port , signal input port,
out put port.When positioner get in put signal ,it compare
with stem position and output is generated and signal
boosted sufficiently to operate the valve . It uses force
balance system.
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