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Question
what is the basic working principle of I/P and Positioner in 
any control valve.
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
I/P is basiclly working on the flapper and nozzle
principle.And the positioner is working on the Forced
balance principle.
 
Is This Answer Correct ?    99 Yes 7 No
Ramana
 
Answer
# 2
I/P Converter , converts 4-20 mA signal from controller
to .2 to 1.0 Kg/cm2 pneumatic signal.

Positioner consist of air supply port , signal input port,
out put port.When positioner get in put signal ,it compare
with stem position and output is generated and signal
boosted sufficiently to operate the valve . It uses force
balance system.
 
Is This Answer Correct ?    46 Yes 10 No
Ashok Polampalli
 
 
 
Answer
# 3
It works on force balance principle. A coil is suspended
in a magnetic field on a flexible mount. At the lower end
of the coil is a flapper valve that operates against a
precision ground nozzle to create a backpressure on the
servo diaphragm of a booster relay. The input current flows
in the coil and produces a force between the coil and the
flapper valve, which controls the servo pressure and the
output pressure.Zero adjustment of the unit is made by
turning a screw that regulates the distance between the
flapper valve and the air nozzle. Span adjustmentis made by
varying a potentiometer,which shunts input current past the
coil.
 
Is This Answer Correct ?    41 Yes 5 No
M M Chotrani
 
Answer
# 4
mA ---> Kg/Cm2 ---> % Valve Open

4 ---> 0.2 ---> 0%
8 0.4 25%
12 0.6 50%
16 0.8 75%
20 1.0 100%
 
Is This Answer Correct ?    10 Yes 3 No
Mayank Rathod
 
Answer
# 5
I/P is input (requirement of process/operator) at which
valve needs to be operated.Positioner gives output
(feedback) to control loop about actual position of valve.
Conclusively-I/P-requirement, Positioner-job done
conformation
 
Is This Answer Correct ?    21 Yes 15 No
Rk Singh
 
Answer
# 6
it's work to forced balanced
principle
 
Is This Answer Correct ?    6 Yes 2 No
Chetan Jodatti
 
Answer
# 7
I/p converter is a heart of
control valve. Positioner is
like a blood circulation.
 
Is This Answer Correct ?    2 Yes 3 No
M.suresh
 
Answer
# 8
i/p means current to penumatic converter its gives 4-20ma
and hi regulate the penumatic pressur
 
Is This Answer Correct ?    2 Yes 8 No
Rahul D Bhoir
 
Answer
# 9
I/P works on Motion Balance and Positioner works on Force
Balance priciples
 
Is This Answer Correct ?    5 Yes 16 No
Parag Pathak
 
Answer
# 10
basic working principle on frequency circuit 
Is This Answer Correct ?    4 Yes 33 No
Aziz
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
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why 4ma show higher zero ? i have transmiter flow renge 0-1000 m3/h but 4 ma show in monitoring 200 m3/h and 20 ma show 1000 m3/h i want when 4ma show 0 m3/h and 20ma 1000m3/h   3
Why we are using 4-20 mA as Analog signal transmission other than 3 to 19 or 2 to 18 or 6 to 22 like wise ? What is the reason behind using 4 & 20 mA? Can anyone give proper technical reply ? Air-Liquide 4
what pressure transmitter? Bhel 8
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Why only negative 24 vdc supply give in vibration measuring system.   5
what is PID n give me brief info. about P&I&D.   2
hi this is noor i wnt know the procedure and precations errection for PRESSURE AND DP transmitters? how to take impusle line for level and flow?(water and steam) impulse line sizes? and type of material ? plz give me answer / reffer any website ? to me "mail2noor.hyd@gmail.com"   1
Where we r using split range and ratio controller? EID-Parry 1
In RTU Panel we are having several Analogue & Digital Inputs /Outputs. We are recently facing some problems over Analog inputs , which are not updating properly (But Digital Input are updating normally) Can any one tell me from where the problem is creating , we have checked PLC CPU card, Analog Input card & we reconfigured ,But still the issue is there. Issue : 1. Sometimes Analog values are updating & sometimes not. 2. Analog values are not updating normally , showing some wrong Values 3. Total dead (0 value) Analog values are Level & flow measurement from the field instruments. (But in field the instruments are working normally & Displaying the values normally in local display unit) This problem we are facing in our Water Plant. If any one experienced this same problem or having any ideas related to our issue PLS send your valuable Answers/Replies... L&T 6
A pressure differential gauge type of instrument has a manifold with 2 isolation valves (hp and lp),2 vents(1 each for hp and lp) and 1 equalizing valve. Determine the position of each valve(either fully closed or fully open) when troboulshooting to: 1. zero the transmitter. 2. determine if there is a block in the impulse line. 3. determine if the gauge is functioning properly. The process fluid is water.   1
how to check electrical health of vibration probe?   1
 
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