What is a key function of a pressure relief valve in HVAC systems?

A pressure relief valve plays a critical role in maintaining safety and functionality within HVAC systems. Its primary function is to release fluid when a set pressure is exceeded. This is essential because excessive pressure can lead to dangerous situations, such as equipment failure or leaks, that could compromise system integrity or even pose safety hazards to people and property.

When the pressure in the system reaches a predetermined threshold, the pressure relief valve opens automatically to allow some of the fluid to escape. This action helps to regulate and lower the pressure, maintaining it within safe operating limits. Ultimately, this ensures the longevity of the HVAC components and the safety of the system as a whole.

The other options describe functions that do not align with the primary role of a pressure relief valve. For example, increasing fluid pressure, controlling temperature, or filtering particles are handled by different components in the HVAC system, such as pumps, thermostatic controls, and filters, respectively.