An electronic expansion valve (EEV) is a device used in refrigeration and air conditioning systems to control the flow of refrigerant. It adjusts the amount of refrigerant entering the evaporator based on the cooling demand, ensuring efficient operation. This precise control helps maintain optimal temperatures and improves energy efficiency. EEVs are typically controlled by a microprocessor that receives data from temperature and pressure sensors. This allows the valve to respond quickly to changes in system conditions, unlike traditional mechanical expansion valves. By optimizing refrigerant flow, EEVs contribute to better performance and lower energy consumption in HVAC systems.