Question 255General Subjects - Assistant Engineer

The correct answer is C) Popping pressure is adjusted by rotating the adjusting ring. The popping pressure of a safety valve is the pressure at which the valve will open and release pressure. For the illustrated huddling-chamber safety valve, the popping pressure is adjusted by rotating the adjusting ring, not the release nut. Turning the adjusting ring clockwise increases the popping pressure, while turning it counterclockwise decreases the popping pressure. The other answer options are incorrect because the release nut is not used to adjust the popping pressure on this type of safety valve. The release nut is used for other functions, such as manually opening the valve, but does not affect the pressure setting.