Question 253General Subjects - Assistant Engineer

The correct answer is D) Lowering the blow down adjusting ring further decreases the area of exposure to pressure after the valve pops and as a result, the valve blow down will decrease. The reasoning is as follows: The blow down adjusting ring controls the area of the valve that is exposed to pressure after the valve has popped open. Lowering the blow down adjusting ring decreases this exposed area, which in turn decreases the pressure force acting on the valve after it has opened. This reduced force results in a decreased blow down, or the pressure drop after the valve opens. The other options are incorrect because: B) is the opposite of the correct answer, as lowering the ring would decrease the exposed area, not increase it. C) is also incorrect, as lowering the ring decreases the exposed area, not increases it.