Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during that if air fail then what will be the condition of valve ( open or close ) ???
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Answer Posted / prem
Since SOV is energized theoretically valve will not close. To depressurize the actuator/valve SOV must de energize to open the vent port.
In Other whand,if pneumatic source become empty and no back up supply, Valve will close gradually due to loss of instrument air supply even though SOV is energized.
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