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Suppose the illustrated pneumatically operated diaphragm actuated control valve is used to control the fuel oil outlet temperature of a steam-heated heavy fuel oil heater by controlling the steam flow. What would be the result if there was a complete loss of pilot air being delivered to the valve actuator? Illustration GS-0051
A) The valve would fail in the fully closed position, most likely resulting in a low fuel oil temperature alarm condition.
B) The valve would fail in the exact position just before the loss of pilot air. The fuel temperature will fluctuate with changes in fuel demand.
C) The valve would fail in the fully open position, most likely resulting in a high fuel oil temperature alarm condition.
D) It is not possible to predict how the valve would respond to a loss of pilot air.
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Illustration GS-0051

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