A control valve which should go to the open position on control signal failure should be labeled FO - Fail Open. The control signal may be pneumatic, hydraulic or electric.
A control valve which should go to the open position on control signal failure should be labeled FO - Fail Open. The control signal may be pneumatic, hydraulic or electric.
A control valve which should stay put on the position on control signal failure should be labeled FL - Fail Last. The control signal may be pneumatic, hydraulic or electric.
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