Which sequence lists outside control valves in order of preference from most to least preferred?

Which sequence lists outside control valves in order of preference from most to least preferred?

• A. Listed indicating valves, control valves installed in a cutoff stair tower or valve room, valves located in risers with indicating posts, and key-operated valves.
• B. Key-operated valves, valves located in risers with indicating posts, control valves installed in a cutoff stair tower or valve room, and listed indicating valves.
• C. Electric actuated valves, key-operated valves, and listed indicating valves.
• D. Manual gate valves first, then ball valves, globe valves, and finally check valves.

Answer: (A)

The sequence reflects how NFPA 14 prioritizes outside control valves for quick, reliable operation with clear status. Beginning with listed indicating valves is best because they are specifically listed for standpipe use and provide a visible indication of valve position, so responders can see at a glance whether the valve is open or closed. Next, control valves installed in a cutoff stair tower or valve room are protected and easy to access, which keeps them usable under adverse conditions. Valves located in risers with indicating posts offer some visibility but are deeper in the building and slower to reach. Least preferred are valves that require a key to operate, since needing a key delays action during an emergency.

The sequence reflects how NFPA 14 prioritizes outside control valves for quick, reliable operation with clear status. Beginning with listed indicating valves is best because they are specifically listed for standpipe use and provide a visible indication of valve position, so responders can see at a glance whether the valve is open or closed. Next, control valves installed in a cutoff stair tower or valve room are protected and easy to access, which keeps them usable under adverse conditions. Valves located in risers with indicating posts offer some visibility but are deeper in the building and slower to reach. Least preferred are valves that require a key to operate, since needing a key delays action during an emergency.