Identify the type of valve required by NFPA 11 for water and foam solutions.

Identify the type of valve required by NFPA 11 for water and foam solutions.

• A. Globe valve.
• B. Ball valve.
• C. Check valve.
• D. Indicator type.

Answer: (D)

NFPA 11 requires valves in water and foam solution piping to show their position so operators can verify, at a glance, that the valve controlling the foam/water flow is open or closed during operation and testing. An indicator-type valve includes a visual indicator or mechanism that moves with the valve, clearly showing its status. This visibility is what NFPA 11 mandates, because it helps ensure the foam proportioning system operates correctly and that valve status isn’t assumed. Other valve types like globe, ball, or check valves perform flow control but do not inherently provide a clear, built-in indication of whether they’re open or closed unless an external indicator is added, which is why the indicator type is the correct choice.

NFPA 11 requires valves in water and foam solution piping to show their position so operators can verify, at a glance, that the valve controlling the foam/water flow is open or closed during operation and testing. An indicator-type valve includes a visual indicator or mechanism that moves with the valve, clearly showing its status. This visibility is what NFPA 11 mandates, because it helps ensure the foam proportioning system operates correctly and that valve status isn’t assumed. Other valve types like globe, ball, or check valves perform flow control but do not inherently provide a clear, built-in indication of whether they’re open or closed unless an external indicator is added, which is why the indicator type is the correct choice.