Answer / malik shams-ul-arfeen

3 element control on boiler controls Drum Level through
control applied on feed water control valve.
3 elements are

1) Drum Level (Master)
2) Feed Water Flow.
3) Steam Flow.

Formula applied on it is. C = A - B.
Where,

C = Control output to Feed Water CV.
A = Feed Water Flow
B = Steam Flow.

U Can contact at msaarfeen@hotmail.com.

Answer / vijayaprakash

question is not clear?
But i thought this is three element boiler drum level
controller.

this controller inputs having drum level, steam flow and
feed flow . it controls output feed water control valve.

where do you give the 4-20 ma i/p in a MIL control valve?

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