Answer Posted / krishnakamesh @ j.e.
sdv means shutdown valve
bdv means blow down valve
Both are used in ESD (emergency shutdown) condition.
SDV: ( closed valve)
it was used in plant inlet & outlet places.whenever plant
was partially OR total shutdown condition, at that time
plant was not disturbed from/to another process,closed the
disturbed process through SDV".
BDV : (opened valve)
It was used in sudden flare OR pressurized
condition,relief that pressure( to avoid dangerous
condition) used this valve.
Both are operated with solenoid valve, with electrical supply.
any thing want more refer google
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