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Question
WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
 Question Submitted By :: Febeena
I also faced this Question!!     Rank Answer Posted By  
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 1
we can calibrate the control valve by using source meter
which is used to give 4 to 20 ma source to I/P , if any
error in the I/P ,we can adjust the zero or span of I/P.if
any error in the valve position ,adjust the zero or span in
the posisner of the control valve.
 
Is This Answer Correct ?    185 Yes 15 No
Ravi Sankar
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 2
actuater. 
Is This Answer Correct ?    31 Yes 148 No
Bhuban
 
 
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 3
solenoid 
Is This Answer Correct ?    14 Yes 148 No
Kamran
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 4
flapper nozzle 
Is This Answer Correct ?    10 Yes 128 No
Ghazi
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 5
pneumatic calibrator 
Is This Answer Correct ?    75 Yes 49 No
Bill
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 6
If the signal is directly connected to EP then we can use
source meter and adjusting the zero and span by giving 4
and 20 mA. If there is I/P then also this method is
applicable. Now if the pneumatic signal to the positioner
is in standard form and not working properly then we can
adjust the valve positioner for proper working..
 
Is This Answer Correct ?    93 Yes 6 No
Aby
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 7
It is simply by using a source meter or loop calibrator.
Inject 4-20mA to the current-pneumatic converter and check
the response of the valve. If you notice that an error
occurs,you can adjust zero or span at the control
positioner...
 
Is This Answer Correct ?    73 Yes 6 No
Shan
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 8
The calibrate the control valve used for mA Source
Meter .mA Souce apply for I/P Converter so Opening Closed
for Control Valve .At the opening closed time measured for
position note.Supposed opening for Valve positioner 50% ma
13.5 So adjust the Zero or Span Calibration to Control the
ositioner
Chart
% Actual Value Error Zero/Span
0 4.7mA 0.7 4mA
25 8.5mA 0.5 8mA
50 12.0mA 0.0 12mA
75 16.4mA 0.4 16mA
100 20.5mA 0.5 20mA
 
Is This Answer Correct ?    78 Yes 8 No
V.suresh Kumar Instrumentation
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 9
For the calibration of a control valve a loop calibrator or
a pressure calibrator can be used between 3-15psi.Check the
valve position for 3psi which is to be 0 for a NC type
valves.In such manner check the valve positon for various
ranges(6psi,9psi,12psi & 15psi).the valve positon shoul be
0 for 3psi and 50% for 9 psi and completely opened for
15psi.
The same procedure is applicable for NO type valves.The
valve is open for 3 psi and completely closed for 15psi.
Any errors occured may be rectified by Zero span adjustment.
 
Is This Answer Correct ?    50 Yes 3 No
Chek Mohidein
 
  Re: WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?
Answer
# 10
ma FEEDER IS USED FOR CALIBRATING THE CONTROL VALVE AND
GENERALLY WE ARE ADJUSTING VALVE POSITION 0%,25%,50%,75%
and 100%AT 4,8,12,16 and 20ma.
 
Is This Answer Correct ?    30 Yes 7 No
Veerababu
 

 
 
 
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