What is an Automotive Air Conditioning Expansion Valve?

[Micah]

Automotive air conditioning expansion valve, also known as a throttle valve, is a key component of the car air conditioning refrigeration system. It mainly consists of three parts: the valve body, temperature sensing bulb, and balance tube, functioning to throttle and reduce pressure. Before the refrigerant enters the evaporator, the expansion valve transforms the medium-temperature, high-pressure refrigerant liquid into a low-temperature, low-pressure wet vapor. The refrigerant then absorbs heat in the evaporator to achieve the cooling effect. The working principle of the automotive air conditioning expansion valve involves detecting and collecting multiple parameters such as superheat, the temperature difference between inlet and outlet air, return air temperature, and their set values. After processing by a microprocessor, it issues commands to control the opening degree of the electronic expansion valve to meet the system's load requirements.