Adjustment of hose connection pressure reducing valves should be performed according to which guidelines?

• A. Authorities Having Jurisdiction guidelines.
• B. Insurance Underwriters guidelines.
• C. Manufacturers guidelines.
• D. NFPA 14

Answer: (C)

Adjustments for hose connection pressure reducing valves must follow the device’s own instructions because each valve model has specific set pressures, tolerances, and procedures. The manufacturer provides the exact steps to adjust, the correct residual pressure at the intended flow, required test methods, and safety notes. If you divergent from those guidelines, you risk setting the valve too high or too low, which can damage hoses, fittings, or the system, or compromise the available flow for firefighting. NFPA 14 gives general requirements for testing and maintenance, but it does not specify how to adjust a particular valve. AHJ or insurer guidelines aren’t the authoritative source for the device-specific adjustment procedures. So, the correct practice is to rely on the manufacturer guidelines.