What is the purpose of the fuel pressurizing valve?

• A. Regulates overall system pressure
• B. Divides flow into primary and secondary manifolds of the duplex nozzle
• C. Provides priming fuel for startup
• D. Shuts off fuel during shutdown

Answer: (B)

In a duplex nozzle setup, fuel must be fed to two separate spray paths—the primary and the secondary manifolds. The fuel pressurizing valve is responsible for dividing the incoming pressurized fuel between these two paths and adjusting the distribution as engine demand changes. This ensures the primary path receives enough fuel for reliable ignition and flame stability, while the secondary path provides additional spray as needed for fueling at higher power or different operating conditions. Proper division of flow between the two manifolds helps maintain stable combustion and efficient operation across the full range of engine power. It isn’t mainly about regulating overall system pressure (that’s done by a regulator), nor is it primarily a startup priming device or a shutdown shutoff valve.