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151. 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
Loss of pilot air releases the diaphragm, allowing the spring to force the valve to its fully open position, increasing fuel oil temperature and potentially triggering a high-temperature alarm.
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