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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q535 - General Subjects
874. Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a steam-heated heavy fuel oil service heater for a steam boiler. If there was an increase in demand for fuel by the boiler, what statement correctly represents how the valve would initially respond
Increased fuel demand initially lowers the fuel oil heater outlet temperature, decreasing bulb pressure and causing the thermostatic diaphragm to flex upward, which opens the pilot valve to admit more steam.
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