In a wet system, pressure gauges are normally found on which valve?

In a wet system, pressure gauges are normally found on which valve?

• A. Main Control
• B. Alarm Check
• C. Drain Valve
• D. Isolation Valve

Answer: (B)

In a wet pipe sprinkler system, you want to monitor the pressure at the point where the system is pressurized and able to signal when water is flowing. The alarm check valve sits right at the threshold between the supply and the system and is the component that prevents backflow while enabling the alarm when a sprinkler head releases water. Placing a pressure gauge there gives a reliable reading of the system’s actual pressure, helping you detect leaks, clogged lines, or valve issues quickly. Draining, isolating, or simply controlling the main supply are different functions, so gauges aren’t placed there for routine pressure monitoring—the drain valve is for emptying, the isolation valve for sectional work, and the main control valve is a shutoff, not a representative pressure-reading point.

In a wet pipe sprinkler system, you want to monitor the pressure at the point where the system is pressurized and able to signal when water is flowing. The alarm check valve sits right at the threshold between the supply and the system and is the component that prevents backflow while enabling the alarm when a sprinkler head releases water. Placing a pressure gauge there gives a reliable reading of the system’s actual pressure, helping you detect leaks, clogged lines, or valve issues quickly. Draining, isolating, or simply controlling the main supply are different functions, so gauges aren’t placed there for routine pressure monitoring—the drain valve is for emptying, the isolation valve for sectional work, and the main control valve is a shutoff, not a representative pressure-reading point.