Answer Posted / parag pathak
Control Valve is final control element of clost loop. So
signal coming to control valve will be in pneumatic form
but depends on size of Valve. It can be 3-15 PSI or 0.2 -
1kg/cm2 but it is not fixed. There is one instrument called
Positioner which will convert 3-15 PSI signal to desired
siganl depending on Control valve.
For any Contol Valve signal will come from Control room in
the form of 4-20 mA. this 4-20 mA signal was converted to 3-
15 PSI signal by instrument called I/P converter. This
siganl will go to positioner and the positioner o/p is
given to valve actuator to get desired opening and closing.
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