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Reading: Calculate Control Valve Stem Position
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Inst Tools > Blog > Control Valves > Calculate Control Valve Stem Position

Calculate Control Valve Stem Position

Last updated: April 20, 2019 1:18 pm
Editorial Staff
Control Valves Formulas
6 Comments
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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?

Calculate Control Valve Stem Position

Calculate Control Valve Stem Position

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):

Valve Position Find

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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6 Comments
  • Suresh says:
    November 17, 2015 at 6:50 am

    Very good

    Reply
  • shaik says:
    January 12, 2016 at 1:49 pm

    Very helpful ?

    Reply
  • Ismail says:
    January 1, 2017 at 4:03 pm

    Very very helpful and too much useful

    Reply
  • Jabulani says:
    September 17, 2017 at 4:51 pm

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

    Reply
  • AMIT KUMAR says:
    October 16, 2024 at 4:19 pm

    Where did these 16 values ​​come from?

    Reply
  • AMIT KUMAR says:
    October 16, 2024 at 4:21 pm

    Y% = X-4
    ——- .100
    16

    Where did these 16 values ​​come from

    Reply

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