Question 50Refrigeration & AC - Assistant Engineer

The correct answer is C) head pressure regulating valve. In a refrigeration system, the head pressure regulating valve is used to maintain a consistent high-side pressure (head pressure) in the system. This helps ensure efficient operation of the compressor and prevents excessive pressure buildup, which could damage system components. The head pressure regulating valve automatically adjusts to changes in ambient temperature or load to keep the head pressure within the desired range. The other options are incorrect because a suction pressure regulating valve controls the low-side pressure, a thermostatic expansion valve controls refrigerant flow into the evaporator, and an evaporator pressure regulating valve is used to maintain a constant evaporator pressure.