Question 362Motor Plants - Assistant Engineer
70% to passThe temperature at which an adjustable bellows type thermostatic valve operates is determined by _______________.
Avarying air loading pressure to the bellows
Bchanging the spring compression opposing the bellows
Cchanging the position of the actuating bulb
Dreplacing the bellows with a heavier spring
AI Explanation
The correct answer is B) changing the spring compression opposing the bellows. In an adjustable bellows type thermostatic valve, the temperature at which the valve operates is determined by the compression of the spring that opposes the expansion of the bellows. Increasing the spring compression raises the temperature setpoint, while decreasing the compression lowers the setpoint. This allows the operator to adjust the valve's temperature response as needed. The other answer choices are incorrect because they do not directly influence the valve's temperature setpoint in the same way as adjusting the spring compression.
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