how pressure reduce through pressure control valve? suppose
we have to reduce 20 kg pressure to 10 kg pressure , then
what we do ? open the valve or close the valve , initially
it is 20 % is upon ( for ur knowledge ).
Answer Posted / senthil r.m
My dear,
In control valve we ll compare the setpoint(operator interference value) and the actual pressure on the line.this deviation is given to the control valve.When the error is positive(means pressure is high),the C/V starts closing and when the error is negative(means pressure is low),the C/V opens and maintains the pressure.
One more thing,why u need to fix the low limit of control valve to open 20%.Depending on the deviation the controller controls the process pressure.
Finally,the controller tuning is must for this control.play with the gain and integral time and deadband to make steady process..
Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
what is cold loop? difference between hot and cold loop?
what is intrinscily safe system and where we use?
Hi Friends i am going to write BARC written test by this month 20th (20-5-2008). So please if any body knows the details about this or having previous question papers pls mail me to kkumarei@gmail.com. For Suggestions give one message to 9962122264
What is Span Error
1.what is the power consumption of three element drum level control in sugar industries? 2.how to reduce that?
Explain why plc require in analog input 4-20amp & 0-10 volt?
Why we are using reverse action in displacer types level transmitters on some Vessels?
Questions on flow meters,few questions on HART protocol,
Specify eight technical requirements that you would consider important, when deciding upon a particular control valve?
Can any one send me IOCL instrumentation question papers.. i dont know the pattern of the questions and what to prepare can any one help me on this .. my email id is anwarnishil@gmail.com
How to work temperature gauge?
Why all the drains(Gland sealing,ESV,Casing inlet etc) are directly connected to the flash tank instead of hotwell of the condensor in the power plant? My Email Id:naba02222@gmail.com
which type of signal used in instrument?
what is performance test.need defination
describe flow nozzel principle?