valve and Actuator

had coop program i oil and gas company and my university required case study on problem we encounter I could not find problem in construction of gas wells and i had suggestion for writing about the PVC pressure control valve they told me they used to have pneumatic actuator and now they have electric driven motor.
my question is this a good case and do you have other suggestion in construction of gas wells for mechanical engineer subjects .
we mainly work with piping valves, interesting Cathod protection induced current although it is mainly electric.
I am really in a mess please waiting for your help.the pages are 3 to 5


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