Can be operate control valve without positioning if yes ? how and why?

Can be operate control valve without positioning if yes ?
how and why?

Question Posted / horil87

4 Answers
7228 Views
Focus, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Can be operate control valve without positioning if yes ? how and why?..

Answer / varun bhardwaj

With out positioner we can operate small size of valves,
but for large sizes of valves , we required Positioner.
Due to force balance principle, the positioner give us a
better accuracy than with out positioner.

Is This Answer Correct ?

6 Yes

1 No

Can be operate control valve without positioning if yes ? how and why?..

Answer / sanjoy panda

Without position-er all the control valve operate but it operating criteria is not satisfy our requirement. Error will be produced very large, and response will be very slow . To avoid on those error we have to use position-er.

Is This Answer Correct ?

4 Yes

0 No

Can be operate control valve without positioning if yes ? how and why?..

Answer / ravi

Without positioner control valve will become on off valve because position feedback dose not transist.

If control valves are able to operate within 3 - 15 psi, that case can possible though I/p converter .

Is This Answer Correct ?

1 Yes

0 No

Can be operate control valve without positioning if yes ? how and why?..

Answer / sunny

No without positioner we canot operate control valve

Is This Answer Correct ?

4 Yes

7 No

Post New Answer

More Instrumentation Interview Questions

what is the deference bitween DCS and PLC SCADA HMI System for Power Process Industry.

1 Answers UltraTech,

My question may be very basic or childish but this question still persists in me, someone plz help me 1.why do we go for differential equations to analyze a system? 2.why do we solve it using matrices, is there any specific reason for using matrices other than the stories like it is simple,faster etc.

2 Answers

what is intools software

2 Answers

Shall we get the reading on level transmitter only by termination,without commissioning?

1 Answers

What is instrumentation measurement?

0 Answers

in a power plant main steam flow is volumetric or mass flow? is it required compensation?

1 Answers Wartsila,

in transmiters(rose mount) how to check output 4-20ma ? and input 24v? i need exact explanation?

2 Answers Adhunik,

How to Calibrate Level Troll in field

0 Answers

Can 2 transmitters be connected to Integral orifice meter taps? Does an integral orifice comes with 2 set of taps?

1 Answers

how many types of thermocouple cable are? give the name of each type.

1 Answers Fabco,

My rtd working well at the same time r/i converter is not working properly.when power is given to rtd..it is giving 30mA and getting 2.4 mA if i remove the compensate leads No matter how many ohms.why it is happening like so?what is the solution?rtd range-0-200deg c& 4-20 mA o/p.please give me solutiin anyone......

1 Answers

what is the working principle of hydra step(electronic level indicator)?

2 Answers Bengal Energy, Lanco,

For more Instrumentation Interview Questions Click Here