Based on ISA'a instrument tagging convention "XV" signifies a miscellaneous switching valve. XXVs and generally emergency isolation valves which woud typically operate in a shutdown or other emergency situation. This is opposed to other process switching valves which operate as part of normal operation
XXV
Definition
Emergency Shutdown Valve
XXV means Emergency Shutdown valve. Based on ISA'a instrument tagging convention "XV" signifies a miscellaneous switching valve. XXVs and generally emergency isolation valves which woud typically operate in a shutdown or…
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