Answer Posted / gopal krishna
there are many control valves.but the most interesting control valve is pneumatic control valve as there will be i/p converter in control valve which takes the signal from plc i.e(4-20ma)and corresponding value of air will be used to operate the stem.now the stem position is taken feedback by positioner in control valve and checks it with the setpoint value.if matches its ok if not gives the compensating signal
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