Question 247General Subjects - Assistant Engineer

The correct answer is B) The adjusting spring would need to have its compression load increased by rotating the adjusting screw clockwise further into the adjusting spring chamber. To raise the pressure setting of the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducer, the compression load of the adjusting spring must be increased. This is achieved by rotating the adjusting screw clockwise, which pushes the screw further into the adjusting spring chamber and increases the spring's compression. This increased spring compression then raises the set point of the pressure-reducer. The other options are incorrect because reducing the spring compression (A and C) or increasing it by rotating the screw counter-clockwise (D) would lower the pressure setting, which is the opposite of the desired outcome.