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

Correct Answer: Option B — The adjusting spring would need to have its compression load increased by rotating the adjusting screw clockwise further into the adjusting spring chamber.

In a pilot-operated pressure-reducing valve, the adjusting spring exerts a downward force on the pilot diaphragm. Rotating the adjusting screw clockwise increases spring compression, requiring higher downstream pressure to lift the pilot valve. This increases the set point, allowing the main valve to maintain a higher regulated pressure.