The control valve for sprinkler system may be located at the system or outside the building. This valve should always be a(n)

• A. Indicating type valve
• B. Non-indicating valve
• C. Locking type valve
• D. Ball valve

Answer: (A)

The essential point is that the main control valve for a sprinkler system must show its position so you can tell at a glance whether it is open or closed, regardless of whether the valve is inside the building or outside. An indicating type valve provides a visible status indicator on the valve itself, so responders, inspectors, and building staff can quickly confirm if water is being supplied to the system. This visibility is crucial for safety and for proper operation during maintenance or emergencies.

Non-indicating valves do not reveal their status, which can lead to confusion or errors. Locking type valves address tampering but don't guarantee that you can see the valve’s position. A ball valve is a valve design; while common, it does not inherently provide the necessary visible indication of whether the valve is open or closed.