cryogenic application in oil and gas industries?

[alhnaity]

where are cryogenic valves used in oil and gas,petrochemical and power industries?

 

[TD2K]

In cryogenic processes

I'm not thinking there are many in power plants or Refineries typically.

Petrochemical plants cover a huge range. Ethylene plants for example have cold sections down to -160C which qualifies as cryogenic temperatures. Air separation plants would be another example though it doesn't fall into your categories in my opinion.

If you can be more specific what you are looking for you'll likely get more in-depth replies.

 

[bcd]

Liquified Natural Gas is another place cryogenic valves are used.