Figure 4.18. Exhaust Diffuser.
a. Normal fuel flow. The fuel flow continues in the fuel
control from the main metering valve to the main system outlet port.
An external line carries the fuel from the port to the
flow divider and dumpvalve assembly. With the introduction of the
atomizing combustor configuration with dual orifice nozzles, a flow
divider dumpvalve assembly was installed to achieve correct fuel
atomization throughout the engine operating range.
The flow divider meters fuel to the engine nozzles
according to a predetermined schedule of secondary flow versus
primary flow. A dump valve is incorporated as an integral unit to
drain the fuel trapped in the manifold and fuel lines when the engine
is shut down. The flow divider and dump valve assembly is designed
to function with fuel pressure up to 1,200 psi with an ambient
temperature of 250 F (121 C) and a fuel supply temperature from 65
F
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