In HVAC systems, the pressure relief valve is a crucial device used to prevent equipment damage or explosion accidents in case of abnormal high pressure. Its function is to automatically open and release excess pressure when the pressure exceeds a set threshold.

Pressure relief valves are usually installed on the high-pressure side of the HVAC system, such as air conditioning condensers and refrigeration units. When the pressure in the system rises above the valve's set pressure threshold, the valve opens, releasing excess refrigerant or air to the outside environment. This ensures the normal operation of the system and protects equipment from damage caused by excessive pressure.

In addition to HVAC systems, pressure relief valves are widely used in other fields, such as automobile engines, compressors, steam boilers, etc. In these systems, pressure relief valves also play an important role in protecting equipment and personnel safety.

It should be noted that although pressure relief valves can effectively protect equipment and personnel safety, they are not devices that can be used casually. Installation and adjustment of the pressure relief valve must follow certain regulations and standards to ensure its normal operation and reliability. Improper installation or adjustment may cause the valve to fail to open or be too sensitive, resulting in unnecessary shutdown or malfunction during normal operation.

In conclusion, the pressure relief valve is a crucial device in HVAC systems that effectively protects equipment and personnel safety. Its role and necessity must be considered during HVAC system design and installation, and installation and adjustment must comply with relevant regulations and standards to ensure the normal operation of the system and personnel safety.