Question 249General Subjects - Assistant Engineer
70% to passIn 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
AThe pilot valve is upward seating and the main valve is downward seating.
BThe pilot valve is downward seating and the main valve is upward seating.
CThe pilot valve is downward seating and the main valve is downward seating.
DThe pilot valve is upward seating and the main valve is upward seating.
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.
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