Can a pneumatic control valve work without positioner?
Answers were Sorted based on User's Feedback
Answer / carl_ellis
Yes, a pneumatic actuator can drive a valve without a
positioner.
In the HVAC world it's done all the time because the service
conditions (temperature/pressure/wear factor) for, say, a
chilled water valve does not necessarily demand the
precision control that a positioner offers.
An I/P (a current to pneumatic transducer) is used to
convert a 4-20mA control signal to a pressure control signal.
The service required in heavy process industries is usually
sever enough that a positioner is used on a control valve.
Company and industry practice will determine the use of a
positioner.
Is This Answer Correct ? | 5 Yes | 1 No |
Answer / ajaya kumar behera
Yes we can only fully open/close by changing instrument air supply from header valve
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / tickno
yes it can ,but if the bench set of CV is on range 3-15 psi(instrument standadt unit,conversion from 4-20mA to 3-15 psi)
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / vergel
No, that is why i call a control valve, we need positioner to control the position of the actuator, if its a simple on off valve, no need for positioner...
Is This Answer Correct ? | 1 Yes | 4 No |
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