Answer / welcome4ujd

you can use fluke milliampre simulator tocalibrate a
controlvalve through i/p converter, ot by using a druck
pressure calibrator directly to the controlvalve positioner.

Answer / upendrae

we can use the 4-20ma source for calibration of the electro
pneumatic valves.

Answer / tarun

CONTROL VALVE HAVE MOSTLY 3 PART BODY,BONNET AND
ACTUTOR,CONTROL VALVE REQUIRED AIR SUPPLY 20 PSI OR 140KPA
AND SIGNAL 4TO20MA AND TOOLS AND STANDURD P.G OR DRUCK. SO
FINNALY WE USE ENOMET SOURSE, DRUCK, OR REGULATOR AND AIR
SUPPLY REQUIRED

Answer / murugesan

First ensure both I/P and positioner air supply are as
it should be before starting up control valve
calibration/stroke checking activity. Then take any of loop
or multifunction calibrator based on the instrument
availability in your plant for Ex 707Ex, UPS-III-IS, UPS-
II, UPS-IS, DPI610 IS (connect series with 24 VDC supply),
UNOMAT and 725Ex

And select “mA source with 24V DC” option and connect 4-
20mA source to I/P converter and simulate appropriate mA to
check the stroke. Normally control valve stoke checking is
called as control valve calibration.

Answer / rushikesh s gaddpawar

CONTROL VALVE CALIBRATATION MANLY USE MA POWER SUPPLY
SOURSE TO CALIBRATE CONTROL VALVE

Answer / balu

WE CAN CALIBRATE IT THROUGH A MILLI AMPS FEEDER IN PRESENT
DAYS

Answer / ali faozy

if the control valve has i/p &postioner we need [ 4 to 20 ]
milliamper dc source , 140 kpa air supply for i/p and 700
kpa for positioner [depending on positioner supply
recommendation]
we need also to calibrate the strock indicator for fully
open and fully close positions
if the control valve has no i/p & positioner then we need
air signal source of [20 to 100]kpa depens on control valve
design
and 700 kpa air supply for valve supply

Answer / shabbir ahmad mughal

we use loop calibrater and miliampere source for
(pst)partial strok testing or calibration of control valve

How to calibrate H2s Dectector

0 Answers   KOC,

send me HPCL paper

6 Answers   HPCL, Shuiba Hotel,

what is dry leg and what is wet leg?

3 Answers  

why we use 4-20 mA to do calibration of the instruments.why we cant use 0-20 mA?

8 Answers   Emerson, IEM,

Are Coils of Electromagnetic flowmeter in direct contact with fluid material

4 Answers   TATA,

Is it possible to drill additional gland hole in EExd or EExe JBs? What are the points to take care?

2 Answers  

How to calibrate and check thermal mass flow meter of Make thermal instrument company inc model 60?

1 Answers   Wood Group,

if we put any thermocouple on a table in a room without any connection,what temperature should it show.

3 Answers  

units for vibration in power plant

1 Answers  

I want to know about DDCMIS in detail ? please explain it. Also give name of reference books in which it is explained in detail in very simple manner.

0 Answers  

If a control valve is hunting means means if we are giving 50% to the cv, the cv will open at 51% then slowly slwoly it will reaches 49% , then it will reaches again 50%, this type of action occured frequntly.. so what to do for solve this problem. The possible cause is in volume booster or positioner's relay.. positioner is double acting .. and make siemens..sipart.The cv is double acting and mounted for anti surge operation, it having 4 nos. volume booster, one sov, one positioner, etc..?

2 Answers   Gujarat Fluorochemicals Limited (GFL), Shell,

how to calculate the temp. of RTD&Thermocouple when we got some mV r Ohms?if anybody has d chart pls mail the chatrs to me...

1 Answers