What are use of positioner.
Answers were Sorted based on User's Feedback
Answer / magi
Exact positioning of the valve stem
To minimise hysterisis
To linerise a nonlinear system
To use in place where actuator cant produce sufficien force
to move the valve stem
Is This Answer Correct ? | 17 Yes | 0 No |
Answer / satish m. patel, bilimora
The valve positioner is used for following reasons.
1. quick action control valve.
2. valve hysteresis.
3. valve used on viscous liquids.
4. split range.
5. line pressure changes on valve.
6. valve bench set not standard.
7. reversing valve operation.
Is This Answer Correct ? | 16 Yes | 2 No |
Answer / sathis.b
we control the valve thru the positioner for the require
percentage we need.
for ex: if u want to open the valve 25%, the command give
from control room it will open or close thru' the
positioner also the forward or reverese of the valve
direction.
Is This Answer Correct ? | 10 Yes | 3 No |
Answer / vinesh prajapati ,guj. +919974
1) Reduces HYSTERESIS due to function at gland portion
2) Improves Linearity
3) Works as a volume booster and Thus improve the speed of
Actuator opretion
4) Works as a span amplifier when spring range of actuator
is not 0.2 to 1.0 Kg/Cm2
5) Required whenever spli range control is required
Is This Answer Correct ? | 5 Yes | 0 No |
Answer / vigneshkumar
Positioner:
A Positioner is like a proportinal Controller.The Set point is the control signal from the primary controller and the controlled variable is the Valve position.
Uses:
1.When the signal Pressure is not enough to operate the control Valve.
2.To make Split range between the valves.
3. It can be used to reverse the action of the actuator from air to open and to air to close & Vice Versa
4.To minimize the effect of Hystersis Effect.
5.To Minimize the Response time for the valve.
6.If the Actuator is spring less Positioner will be used.
7.If the Valve has high friction .
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / ddd
CONTINUOS FEED BACK /HYSTERSIS/BOOST UP AIR FOR OUTPUT
Is This Answer Correct ? | 1 Yes | 0 No |
How a pH sensor & analyzer work at waste water treatment plant, whats the principle & science is beyond this,How pH sensor sence & convert signal & move toward analyzer & analyzer show reading in percent? also what is temperature compensate option in analyzer
Dear Sir/Madam, I am attending an interview for ETs in BHEL. I have cleared my written test under Electronics (Instrumentation). This is the first time I am appearing for an interview. Can any one who has attended the interview earlier give me a clue to face the interview. With regards Sindhu
difference between null and deflecting instrument.
what is input and output cards of plc needs to be hot swappable mean
What is minimum distance between three thermocouples (2oo3) mounted on same pipe line (20")? Technically accepted by stright line mounted or circler mounted?
Is SmartPlant Instrumentation taking advantage of the quality assurance procedures within Intergraph?
why 8bit microprocessor referred as 2^16?
how to calibate level transmiter ?range -150 to +150.what is the zero and span?
Shall we get the reading on level transmitter only by termination,without commissioning?
What is electronics?
Draw a simple circuit for a well head control panel used to protect the well against fire, leak, blockage, ESD, & controls the operation of one downhole & one surface safety valve. Explain the operation and controls
what difeerent between HART and BRAIN?