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What is the purpose of valve positioner. Explain 4 uses.
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Answer Posted / carl_ellis
What is the purpose of valve positioner. Explain 4 uses.
1) Use supply air pressure to ensure the correct valve
position through feedback control to overcome stiction or
forces on the valve plug.
2) Characterized the non-linear valve movement with respect
to the input signal, for instance, equal percentage or quick
opening
3) Provide position feedback to the control system via
conditioned process signal (4-20ma)
4) Provide adequate seat loading force to ensure tight
shut-off.
Carl Ellis
Measure First
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