HVAC Metering Devices Practice Test

The EEV is electronically driven and controlled; what major function does it share with a TXV?

Maintains system pressure

Restricts refrigerant flow

The electronic expansion valve (EEV) shares the function of restricting refrigerant flow with the thermal expansion valve (TXV). Both devices are integral to refrigerant management in HVAC systems, ensuring that the proper amount of refrigerant enters the evaporator based on the demand for cooling.

By controlling the flow of refrigerant, the EEV and TXV help maintain the desired temperature in the evaporator and enhance the system's overall efficiency. While the EEV uses electronic controls to adjust the flow more precisely in response to system conditions, the TXV relies on thermal sensing of the refrigerant’s superheat. This shared function is crucial for optimizing performance across varying load conditions in the HVAC system.

Regulates temperature

Filters contaminants