Which safety device prevents overpressure in a refrigeration system?

The pressure relief valve is specifically designed to safeguard a refrigeration system by preventing overpressure conditions. This device operates by automatically releasing excess pressure that builds up within the system to a predetermined level. This is crucial because excessive pressure can lead to system failure or catastrophic damage, risking both equipment and personnel safety.

In refrigeration systems, maintaining the correct pressure is vital for efficient operation and safety. The pressure relief valve acts as a critical safeguard by ensuring that if the pressure exceeds safe limits—due to factors like a malfunctioning compressor or blocked lines—the built-up pressure is released, thus protecting the integrity of the system.

Other devices mentioned serve different functions. For instance, the thermostatic expansion valve regulates the flow of refrigerant based on the temperature of the evaporator but does not address overpressure issues directly. Similarly, the check valve is designed to allow flow in one direction and prevent backflow, while the solenoid valve controls the flow of refrigerant based on electrical signals but again does not provide pressure relief. Thus, the pressure relief valve is the dedicated safety device that prevents overpressure in refrigeration systems.