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[von1987]

Can anyone describe to me the operation of a subsea christmas tree?? I need to evaluate the faults which will occur with subsea valves but I do not even have a clear picture on how they work, I have spent days on the internet but still have not found any detailed information. I would like to know the functions of a production master valve, annulus master valve, production wing valve, annulus wing valve, choke valve, pin valve and downhole safety valve. Do let me know if you know where I can find useful resources. Thank you.