Which valve is used to test a wet pipe system to prevent unseating and the alarm?

• A. Alarm bypass valve
• B. Drain valve
• C. Check valve
• D. Isolation valve

Answer: (A)

In testing a wet-pipe system, you want to verify the operation of the alarm and waterflow without actually discharging water from the sprinkler heads or triggering unintended alarm signals. The alarm bypass valve provides a dedicated path for test water that bypasses the main alarm and sprinkler discharge path. By using this valve at the inspector’s test connection, you can simulate flow and confirm the alarm circuitry and supervisory devices function correctly while keeping the rest of the system pressurized and the sprinklers idle. The other valves serve different roles (draining, preventing backflow, isolating sections) and don’t provide this controlled test path, which is why the alarm bypass valve is the appropriate choice for testing purposes.