Answer Posted / senthil r.m

my dear,
when there is no positioner it is not called as control valve.i think u dont know about it.we will give 4 to 20 milliamps to the positioner accordin to tht the valve throttles b/w 0 to 100%.Tuning is different concept which i can give u details to go through it.senthilrmohan@gmail.com

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