Which voltage is typically used to operate an electric expansion valve in a refrigeration system?

Electric expansion valves (EEVs) are commonly used in refrigeration systems to regulate the flow of refrigerant based on the cooling demand. The typical control voltage required for these valves is often 24 volts, either AC or DC.

Using 24 volts for operating electric expansion valves allows for safer operation and lower energy consumption compared to higher voltage options. Lower voltages are also more compatible with low-voltage control systems, which are prevalent in HVAC applications. This is advantageous for integrating with other control devices, such as thermostats and relays, that also operate on similar voltages.

In summary, the choice of 24 volts AC or DC for operating an electric expansion valve aligns with industry standards for safety, compatibility, and efficiency within refrigeration systems.