Which component in a sprinkler system is used to reliably lower water pressure to prevent damage?

• A. Water meters
• B. Frame arms
• C. Pressure-reducing valves
• D. NFPA 13

Answer: (C)

Controlling water pressure is essential in low-rise residential sprinkler systems because supplies can be much higher than what the piping and sprinklers are designed to handle. A pressure-reducing valve is the component that reliably lowers and regulates that pressure to the system’s design level, protecting pipes, fittings, and sprinkler heads from over-pressurization and reducing the risk of damage or water hammer. Installing it at the service entry ensures the system sees a consistent, appropriate pressure for proper operation.

Water meters measure how much water flows, not the pressure. Frame arms are parts that support or position components and don’t reduce pressure. NFPA 13R is the standard that governs design and installation, not a physical device.