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Why the Air Tank Accumulators required for the single acting
actuators SDV's or BDV's as I see in some Schematic diagrams
of ROTORK ??
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Answer Posted / ayaz
Sdv or bdv work on demand of emergency, so we use the fail safe position
1-when any electrical or pneumatic supply fail the valve will be go on safe position
2- when use double action means two side supply produce not a spring to close.
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