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Answer Posted / rabindra ojha
pneumatic control valve operated by air.to operate a cotrol
control valve requared accesories are (air, i/p,
positioner,regulator).i/p inlet air is 1.5 kg/sq.cm and
signal is 4 to 20 ma.i/p output is 0.2 to 1 kg/sq.cm.when
command is given corresponding output of i/p is gone to
positioner.its output go to control valve to operate the
control valve. positioner works on flaper nozzle principle.
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