Which component is crucial for preventing overpressure in refrigeration systems?

The pressure relief valve plays a vital role in refrigeration systems by ensuring that excessive pressure does not build up within the system. When refrigerant is compressed, the pressure in the system can rise significantly. If this pressure exceeds safe operating levels, it can lead to equipment failure, leaks, or even hazardous situations. The pressure relief valve is designed to open at a predetermined pressure level, allowing refrigerant to escape and thereby relieving excess pressure. This safety mechanism protects the integrity of the refrigeration system and maintains optimal operational conditions.

The other components mentioned, while essential in their own right, do not directly serve the function of preventing overpressure. The expansion valve regulates the flow of refrigerant into the evaporator coil but does not manage system pressure. The condenser coil dissipates heat, and the evaporator coil facilitates the absorption of heat, but neither has the function of releasing excess pressure. Thus, the pressure relief valve is crucial for the overall safety and functionality of refrigeration systems.