In a duplex nozzle, what component is used to divide and pressurize primary and secondary fuel flow?

In a duplex nozzle, what component is used to divide and pressurize primary and secondary fuel flow?

• A. A pressurizing valve or a flow divider.
• B. A secondary fuel pump.
• C. An electric valve.
• D. A venturi meter.

Answer: (A)

Duplex nozzle performance hinges on how the fuel from the high-pressure line is split into two controlled paths and kept at the right pressure for each path. A flow divider handles the actual division and helps establish the proper pressure relationship between the primary and secondary streams, and a pressurizing valve (or the divider itself designed to provide pressure) maintains the necessary pressure for the secondary circuit. This arrangement ensures both streams spray correctly and mix to power stable combustion across operating conditions. The other options don’t accomplish both division and the required pressurization: a secondary fuel pump would supply fuel generally but isn’t the nozzle’s internal splitter; an electric valve is a control element, not the divider; a venturi meter measures flow, not divide and pressurize the two fuel paths.

Duplex nozzle performance hinges on how the fuel from the high-pressure line is split into two controlled paths and kept at the right pressure for each path. A flow divider handles the actual division and helps establish the proper pressure relationship between the primary and secondary streams, and a pressurizing valve (or the divider itself designed to provide pressure) maintains the necessary pressure for the secondary circuit. This arrangement ensures both streams spray correctly and mix to power stable combustion across operating conditions. The other options don’t accomplish both division and the required pressurization: a secondary fuel pump would supply fuel generally but isn’t the nozzle’s internal splitter; an electric valve is a control element, not the divider; a venturi meter measures flow, not divide and pressurize the two fuel paths.