What are the functional differences between XV, XCV, EIV, and UV in a PID diagram, and how are they defined?
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Question: What are the functional differences between the XV, XCV, EIV, and UV shut-off valves in a PID diagram, and how are they defined?
The XV universal cut-off valve; UV generally refers to a on/off valve for specific operating conditions (typical sequential control).
PID values usually have tag number descriptions on the first two pages; just check those descriptions