What is the purpose of a pressure-reducing valve (PRV) in a sprinkler system?

• A. It indicates valve position remotely
• B. To regulate and maintain the correct system pressure at the design level for proper sprinkler operation
• C. It boosts water temperature
• D. It monitors air pressure

Answer: (B)

A pressure-reducing valve lowers high incoming water pressure to the level the sprinkler system was designed to operate with. By keeping the system pressure at the intended design level, it ensures the sprinklers produce the correct flow and spray patterns, providing reliable activation and effective coverage across the network. If supply pressure is too high, leaks, pipe and valve wear, and erratic spray can occur; if it’s too low, the system may not deliver sufficient water to control a fire. The valve is adjustable and placed to protect the system from excess pressure. It isn’t used to indicate valve position, boost water temperature, or monitor air pressure.