What does NFPA 13 state about using pressure reducing valves in sprinkler systems?

NFPA 13 addresses the use of pressure reducing valves in sprinkler systems by emphasizing their role in managing water pressure, particularly at the sprinkler heads. The correct choice indicates that pressure reducing valves may be used to ensure that adequate pressure is maintained at the sprinklers while preventing any exceeding of established pressure limits. This is crucial because too much pressure can lead to system failure, such as damaging sprinkler heads or causing excessive water discharge.

The standard allows for the use of these valves in a way that promotes operational efficiency and safety within the sprinkler system, facilitating optimal performance where variable pressures may affect coverage or cause operational issues.

In contrast, the other options do not correctly reflect the guidelines provided in NFPA 13. Some mistakenly rule out the use of pressure reducing valves altogether or misrepresent their purpose, focusing instead on maintaining high pressure or limiting their application to special hazard systems, which isn't aligned with the broader guidance of the standard concerning effective risk management in various sprinkler system types.