Question 249General Subjects - Assistant Engineer70% to pass
In the illustrated self-contained, internal-pilot, piston-operated steam pressure- reducing valve, what statement is true concerning the pilot and main valves? Illustration GS-0044
AI Explanation
The correct answer is D) The pilot valve is upward seating and the main valve is upward seating.
This is correct because in a self-contained, internal-pilot, piston-operated steam pressure-reducing valve, the pilot valve and the main valve are typically designed with upward seating configurations. This allows the valves to close against the pressure of the steam, ensuring a tight seal and effective pressure reduction.
The other options are incorrect because they do not accurately describe the seating configuration of the pilot and main valves in this type of pressure-reducing valve system.
Related Questions
#247 How would the pressure setting of the illustrated self-contained, internal-pilot, piston- operated steam pressure-reducer be raised to a higher set point? Illustration GS-0044 #248 How would the illustrated valve respond to a complete loss of charge from the remote bulb-to-control diaphragm power element if the valve is used as a temperature control valve for a steam-heated heavy fuel oil service heater? Illustration GS-0045 #250 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 a decrease in demand for fuel by the boiler, what statement correctly represents how the valve would initially respond? Illustration GS-0045 #251 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? Illustration GS-0045 #252 As it pertains to safety valves, what is the definition of blow down?