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

Correct Answer: Option D — The pilot valve is upward seating and the main valve is upward seating.

Both the pilot and main valves are upward seating, meaning they open against the direction of fluid flow. This design ensures that the inlet pressure assists in keeping the valves closed, providing a fail-safe mechanism where the valves remain seated if the control pressure or spring force is lost.