Question 149Steam Plants - 1st Asst/Chief70% to pass
What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve?
AI Explanation
The correct answer is A) The principle by which blow down is accomplished.
The primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve is the principle by which the blow down (reduction in pressure after the valve has opened) is accomplished. In a nozzle reaction valve, the blow down is achieved through the nozzle reaction, while in a huddling chamber valve, the blow down is accomplished through the pressure differential created in the huddling chamber. This fundamental difference in the blow down mechanism is the key distinction between these two types of safety valves.
The other answer choices, B, C, and D, are not the primary operational difference, as they focus on other valve characteristics rather than the mechanism of blow down.
Related Questions
#147 Testing boiler water for chloride content will indicate the amount of _______________.#148 Which of the following would indicate a moderate leak in the desuperheater? #150 Which of the listed types of safety valves is shown in the illustration? Illustration SG-0018 #151 When excessive static boiler pressure has resulted in the initial lift of the valve disc, a huddling chamber safety valve will continue to lift open as a result of _______________.#152 On a boiler safety valve, the blow down adjusting ring is locked in place by a _______________.