Which device is used to regulate refrigerant flow in a refrigeration system?

The expansion valve is a critical component in a refrigeration system specifically designed to regulate the flow of refrigerant. Its primary function is to control the amount of refrigerant that enters the evaporator from the high-pressure side of the system. By doing so, it maintains the optimal pressure and temperature necessary for the refrigerant to evaporate and absorb heat effectively from the environment or the space being cooled.

When the refrigerant leaves the high-pressure side of the system, it is in a liquid state and needs to be expanded to a lower pressure to facilitate cooling. The expansion valve accomplishes this by creating a pressure drop, allowing the refrigerant to cool and change states from liquid to vapor as it enters the evaporator. This process is essential for the cycle of heat absorption and removal that characterizes refrigeration systems.

This device plays a vital role in improving the efficiency of the system and ensuring that the refrigerant flows in a controlled manner, which is crucial for the overall operation of HVAC systems.