Question 249General Subjects - Assistant Engineer

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.