when the operation engineer told you that he gives the
control valve order to open but there is no response !
what will you do ?
and if you found that there is astuck , what will you do ?
(note : it is apanumatic valve )
Answers were Sorted based on User's Feedback
Answer / chitturi bhaskara rao
1.First measure 4-20mA in field side if cannot get 4-20
then check AO card , if u got 4-20 in field side then check
positioner ,
2. make sure thatt sufficent air supply i,e 3 to 4 bar at
inlet of positinoer.
3.If all correct still valve nvr moves then remove
positionner from the valve and supply the air directly to
actuator ( to 4 bar max) then valve moves smoothly then
check angle of postioner while ur fixing positoner on
control valve .
4 if valve nvr moves smoothly means in side valve jam need
to send over haul
Is This Answer Correct ? | 20 Yes | 0 No |
Answer / maneesh
after doing all the priliminary inspection if u found the
valve is struck, u can directly give the air supply to the
actuator not:direct applying og air supply may diamage the
valve it should be done with sufficiant care.if the struck
is minor by repeaded giving of supply air will slowly
remove the struck.agfer this still its struck u can remove
the valve from the praocess line and chel the valve body
whether any solid material bloks the way.if that u can
clean and fix it back
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / b.kumaran
after doing all the priliminary inspection if u found the
valve is struck, u can directly give the air supply to the
actuator in a repeated manner.if the struck
is minor by repeaded giving of supply air will slowly
remove the struck.still its struck then loosen the body
bolts and try to open by the above method. If still there is
a struck up then u can remove the valve from the process
line, dismantle and clean the valve body whether any solid
material bloks the way.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / 808
Simulate 4-20mA it with a DMM at control valve. If it works
there, then check wiring.
Is This Answer Correct ? | 1 Yes | 3 No |
Answer / aatif alvi
check if the proper volatage i.e 4-20ma is changing the the
operation engineer changes he valve position. if it is
changing the the problems might be with the solonoid..some
times moving the solinoid with screw driver makes it work
again,, as it got stuck due to rusting.
Is This Answer Correct ? | 1 Yes | 4 No |
how to install the Ph and Conductivity analyser? is there are any procedures which has to be maintained.
What is the Working principle of Dozing valve?
In close vessel/ drum why we use d.p. transmitter of -ve range i.e. (-)500 to 0 mmwc.
hi i'm an Instrumentation student,i have one doubt that we can call- > computer science as CS > Information science as IS > Electronics & communication as E & C In the same way what is short term for Instrumentation....?
Which of the following instruments consumes maximum power during measurement?
-/5A. What is the meaning and limitations of this in energy meter constant. It is a 3 phase LT Energy Meter. If this Energy Meter is connected through a CT of ratio 200/5 Amps, then what is the multiplying constant and how its will be calculated.
As an industrial instrument technician what we have to know?
Where we cant instal mass flow meter.
I have a close vessel tank which is under vaccum when in running condition so pl. Provide it's range for dp type tx whose flange to flange distance is 440 mm and density is 1
State four different types of flow measurement.
what is the difference between Digital output DO signals /Commands for start/stop and Solenoid valves ??
What is the use instrument barriers? Can you give me review materials about this?