What is the term for the main water control valve in an automatic sprinkler system?

• A. Indicating Valve
• B. Control Valve
• C. Isolation Valve
• D. Main Valve

Answer: (A)

The main idea tested here is recognizing the valve that both controls water flow to the sprinkler system and provides a visible status of whether it is open or closed. That combination of function and status indication is what defines an indicating valve. In many automatic sprinkler setups, the main water control valve is equipped with a visible indicator and, often, a tamper switch, so you can quickly confirm its position and ensure the system can deliver water when needed. That specific terminology is used to highlight not just the valve’s role in starting or stopping flow, but also the built-in indicator that communicates its status. While “isolation valve” describes the function of shutting off flow, and “main valve” or “control valve” are more generic terms, they don’t name the feature that tells you the valve’s open/closed state, which is why indicating valve is the best choice.