What type of valve is used to manage high-pressure situations in HVAC systems?

A pressure relief valve is specifically designed to manage high-pressure situations in HVAC systems by automatically releasing pressure when it exceeds a predetermined level. This function is crucial to maintaining safety and preventing potential damage to the system. In high-pressure scenarios, excess pressure can lead to catastrophic failures, such as ruptures or explosions, so the pressure relief valve serves as a protective mechanism to divert the excess pressure safely away from the system.

In contrast, a flow control valve regulates the flow of refrigerant or other fluids but does not directly address pressure issues. An expansion valve is primarily responsible for controlling the flow and pressure of refrigerant in refrigeration and air conditioning, while an isolation valve is used to control the flow of fluid and isolate sections of a system for maintenance or repairs, but it does not provide the same level of safety in high-pressure situations as a pressure relief valve does. Therefore, the pressure relief valve is the most suitable choice for managing high-pressure conditions in HVAC systems.