In an automatic expansion valve system, constant pressure is maintained at the:

In an automatic expansion valve system, the constant pressure is maintained at the evaporator inlet. This is essential because the primary function of the automatic expansion valve is to regulate the flow of refrigerant into the evaporator, ensuring that the pressure remains stable.

By maintaining a constant pressure at the evaporator inlet, the system can effectively control the refrigerant expansion process, promoting efficient heat exchange as the refrigerant absorbs heat from the surrounding environment. This is critical for proper evaporator function, as it allows the refrigerant to evaporate at the desired temperature and pressure, optimizing the cooling performance.

Maintaining constant pressure at this point also ensures that the system can respond efficiently to varying load conditions, as the automatic expansion valve adjusts the refrigerant flow based on demand. This dynamic regulation helps maintain system efficiency and prolongs the lifespan of the components by preventing issues like flooding or starvation of the evaporator.