Which statement best describes PRVs in high-rise buildings?

• A. They are never used in high-rise buildings
• B. They help regulate water pressure in the system
• C. They are used only in gas systems
• D. They must be visually monitored hourly

Answer: (B)

The main concept is that pressure-regulating valves in high-rise buildings serve to keep the water pressure entering the fire-protection system within a safe, design-specified range. In tall buildings, the municipal water supply can be much higher than what the sprinkler system is designed to handle, and pressures can vary with elevation. A PRV lowers that incoming pressure to a level the system can tolerate, protecting sprinkler heads, piping, and valves from overpressurization, reducing the risk of leaks or damage, and helping ensure consistent performance on all floors. They’re part of water-based fire protection design, not limited to gas systems or require hourly visual monitoring.