What is the primary function of a thermostatic expansion valve (TXV) in a refrigeration system?

The primary function of a thermostatic expansion valve (TXV) in a refrigeration system is to regulate the flow of liquid refrigerant into the evaporator to maintain a constant level of superheat at the evaporator outlet. Superheat is the temperature of the refrigerant vapor above its saturation temperature at a given pressure. Maintaining proper superheat ensures that only vapor refrigerant enters t....