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Control Valves Formulas

Calculate Control Valve Position

An electronic  loop controller  outputs  a signal of 8.55 mA to a direct-responding control valve (where 4 mA is shut and 20 mA is wide open).  How far open should the control  valve be at this MV signal level?

Control valve positioner calculation

We are solving this problem using standard 4-20mA conversion Formula. Click here for formula

To solve for percentage of stem travel (x) at 8.55 milliamps of signal current (y), we may use the linear equation developed previously to predict  current in milliamps (y) from signal value in percent (x):

controller output 4 to 20 mA calculation

Therefore, we should expect the valve to be 28.4% open at an applied MV signal of 8.55 milliamps.

We can also solve the problem using direct formula. Click here for formula

Also Read: Instrumentation Formulas

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4 comments

Suresh November 17, 2015 at 6:50 am

Very good

Reply
shaik January 12, 2016 at 1:49 pm

Very helpful ?

Reply
Ismail January 1, 2017 at 4:03 pm

Very very helpful and too much useful

Reply
Jabulani September 17, 2017 at 4:51 pm

Thank you very much for sharing your vast knowledge with us.

Reply

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