Question 60Refrigeration & AC - QMED

The correct answer is C. The expansion valve designed to maintain a constant evaporator pressure rather than a constant evaporator superheat is option C. This type of expansion valve is known as a pressure-regulating or pressure-limiting expansion valve. It is designed to maintain a specific evaporator pressure by automatically adjusting the refrigerant flow, which helps to prevent excessive pressure buildup in the system. The other options, A, B, and D, are typically used to maintain a constant superheat at the evaporator outlet, which is important for efficient system operation and to prevent liquid refrigerant from entering the compressor.