Answer Posted / harsh zala
Yes, We can use control valve without a positioner. The
basic purpose of positioner is to supply required punemetic
air w.r.t 4-20 mA standard signal, you can say for example
3.2 kg/cm2 to 4 kg/cm2. and it also checks for the
appropriate vavle opening(feedback) and stops air supply
going to valve actuator.
Without Positiner we can use control valve,but we must have
i/p converter, which generally converts 4-20 mA signal to
0.2 -1 kg/cm2, so in that case valve will not opearate
fully . but it will opearate upto certain level.
So when positoner got fail and we dont have new one, and if
we require valve to be controlled upto certain level, we
can use i/p converter,
| Is This Answer Correct ? | 20 Yes | 6 No |
Post New Answer View All Answers
need instrumentation job completed 1 year trainee ship in mnc pesticide company. now in search of job
how to calculate control valve bonnet size?? or how to select its material?
What is ultrasonic flowmeter?
How the sizing of the analog signal cable is calculate?
What is the use of single seated valve?
Explain working principle of lvdt?
How to calibrate the flow transmitter
what is the vital subject for scoring bhel exam&what is the question pattern
What is modbus?
Why do we have earthing cable in branch cable and shield in the same cable?
i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......
What is PDS and PDMS ?
Why humidity limit is 30 to 55 % for raw material storage?
how pressure transmitter work, what is its principal to measure and how its generate signal. for pressure transmitterinstallation which precautions must be taken ??
What is the use of GMV in turbine?
