a Pressure Relief Valve (PRV) is a safety device designed to protect a pressurized system or vessel from exceeding its maximum allowable pressure. The primary function of a PRV is to automatically release excess pressure from a system when it reaches a predetermined set point, thereby preventing potential equipment failure, explosions, or other hazardous situations.

PRVs are commonly used in various systems, including plumbing, heating, ventilation, air conditioning (HVAC), and fire protection systems. They are essential components in ensuring the safety and integrity of pressure vessels, pipelines, and other pressurized equipment.

Key characteristics of PRVs in commercial construction include:

1. Set Pressure: The specific pressure at which the valve is designed to open and relieve excess pressure.

2. Capacity: The rate at which the valve can discharge fluid, ensuring that pressure does not exceed safe levels.

3. Material: Constructed from materials compatible with the system's fluid and operating conditions, such as stainless steel, brass, or other corrosion-resistant materials.

4. Compliance: Must adhere to relevant Australian standards and regulations, such as AS 1271 for safety valves, to ensure proper performance and safety.

5. Maintenance: Regular inspection and testing are required to ensure the PRV functions correctly and reliably over time.