Expansion valves are critical components in air conditioning systems that use refrigerants to cool the air.

Its function is to regulate the flow of liquid refrigerant from the evaporator to the condenser, where the refrigerant evaporates and absorbs heat from the air flowing through the evaporator. Expansion valves are responsible for maintaining a proper pressure difference between the evaporator and the condenser, allowing for effective heat transfer.

There are several types of expansion valves used in air conditioning systems, but one of the most common is the thermostatic expansion valve (TXV).

The TXV works by regulating the amount of refrigerant flowing into the evaporator, which in turn controls the amount of heat that is absorbed from the air flowing through the evaporator. The TXV uses a temperature bulb attached to the evaporator to sense the temperature of the refrigerant and adjust the valve opening accordingly.

Another common type of expansion valve is the electronic expansion valve (EEV).

The EEV uses a pressure sensor and electronic control to adjust the valve opening based on system operating conditions. This allows for more precise control of refrigerant flow and can improve the efficiency and capacity of the air conditioning system.

It is important to select the proper expansion valve for an air conditioning system based on its cooling requirements and system design parameters.

An incorrectly selected expansion valve can cause efficiency problems, temperature control problems, and damage to system components.

Therefore, it is advisable to have the advice of a technician trained in the selection and maintenance of expansion valves in air conditioning systems.