Hi Harsh84,
I need more context on your project to answer this question. Are you designing your own Back Pressure Regulator? If yes, you could consider this post from Paul Falkenstein:
"
If you are making your own BPR you should look at some of the feedback examples using PID,
your process variable is the Pressure measured at the sensor the control is the position of the valce probably 0-100% open and the controlling is through steps and direction in the stepper motor, this should be a start.
You can start with a simple Bang-Bang controller but there is often a much more complex nature to pressure regulation so PID is often used.
"
from:
How can you control pressure on a valve using voltage
This sounds like a good start.
Regards,
Mario_C