The TXV maintains a fully fed evaporator by controlling the:

The thermostatic expansion valve (TXV) is crucial for the efficient operation of the refrigeration cycle by controlling the flow of refrigerant into the evaporator based on the superheat measurement. Superheat is the temperature of the refrigerant vapor above its saturation point at a given pressure. By maintaining the correct level of superheat, the TXV ensures that the evaporator operates at full capacity without flooding or starving.

When the evaporator receives the proper amount of refrigerant, it can absorb the maximum amount of heat, which is vital for effective cooling. If the superheat is too low, it indicates that there is too much refrigerant entering the evaporator, which could lead to liquid refrigerant returning to the compressor and causing damage. Conversely, if the superheat is too high, it suggests insufficient refrigerant flow, resulting in reduced cooling capacity. Therefore, by regulating the superheat, the TXV plays a critical role in optimizing the refrigerant flow and maintaining the evaporator in a fully fed state, ensuring efficient and effective operation of the HVAC system.