Answer / bunny

Valve positioner is an instrument used with automatic
control valves,not with a manual valve.An automatic control
valve open/close basicaly according to the control signal
from a controler(e.g a PLC),say,4-20MA.For every control
signal comming from the controler,there would be a
corrsponding position for the valve plug,which determines
the flow rate.But in practical applications,the valve
position might not get maintained by the controller action
alone.So if there is any deviation in that position,we need
to rectify that and for that we are using a valve
positioner.

As you are fresher in Instrumentation & control engineer.Then why should I select you?

1 Answers  

---

How to rerange a dp type level transmitter after installation?

1 Answers   NSH,

---

Guy's need your support,I want to measure closed tank level which is under vacuum -630mmHg using DP Transmitter, tank fluid density 1.38, Tank height is 7ft

4 Answers   icl,

---

our kks tagging is crossing more than 12 character please suggest how to take tags in the DCS

0 Answers  

---

Why hunting will occour in control valve?

6 Answers  

---

what is the conversion factor for nm3 to kg/hr in air flow

4 Answers  

---

DEAR SIR/MADAM MY NAME IS ARKAPROVA BHATTACHARYYA.I AM A FRESHER INSTRUMENTATION ENGINEER.CAN YOU PLEASE SEND SOME QUESTION PAPERS OF GRADUATE ENGINEER TRAINEE EXAM OF DVC(DAMODAR VALLY CORPORATION).MY EMAIL IDs ARE arka_aec@rediffmail.com.

0 Answers  

---

what is mean by hot loop and cold loop testing, whts different between both

2 Answers   Honeywell, PDO,

---

what is the input to be given digital temp controller during the the calibration time?

2 Answers  

---

how can loop single 4-20 ma to two isolation amplifier? i mean i have two isolation amplifier with 4-20 ma input and 1-5 v output.can i done series connection ?

1 Answers  

---

How many input(Analog and digital) and outputs(Analog and digital) are there in DELTA v DCS Version 7.0?

2 Answers  

---

What is wet leg condition and why is it used?

0 Answers  

---