How would the pressure setting of the illustrated self-contained, internal-pilot, piston- operated steam pressure-reducer be reduced to a lower set point? GS-0044

Correct Answer: Option B — The adjusting spring would need to have its compression load reduced by rotating the adjusting screw counter-clockwise further out of the adjusting spring chamber.

To reduce the set point of a pilot-operated pressure-reducing valve, the compression on the adjusting spring must be decreased. Rotating the adjusting screw counter-clockwise moves it out of the spring chamber, reducing the downward force on the diaphragm, which allows the valve to throttle at a lower downstream pressure.