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TM 10-4930-243-13&P
Section III. PRINCIPLES OF OPERATION
1-10. SYSTEM TECHNICAL PRINCIPLES OF OPERATION.
The CCR nozzle delivers pressure-regulated fuel to the closed-circuit adapter, the collar moves forward, locking the
nozzle in place. The vehicle adapter contains an orifice sized to provide a predetermined fuel flow rate.
In addition to regulating fuel delivery pressure, the CCR nozzle serves as a fuel on-off valve. The valve is operated
manually to either the closed or the flow (open) position. The internal poppet is then seated closed, shutting off flow.
Fuel flow is initiated by pushing forward on the handle latch, releasing the handle, then moving the handle up to the flow
position. This unlocks the internal valve poppet and diaphragm allowing the fuel regulator to start fuel flow.
The fuel supply pressure exerts a force on the diaphragm assembly at the back of the poppet. This force is balanced by
a calibrated regulator spring to maintain a valve opening which provides a nominal discharge pressure of 15 psig from
the nozzle.
The nozzle flow indicator, attached to the back end of the poppet, provides a red indicator when the nozzle valve is
closed. This indicator is visible to the operator at the center of the end cover.
When the refueled tank is filled, back pressure closes the nozzle poppet and flow ceases. When the nozzle handle is
returned to the closed position, the handle latch locks the handle in the closed position. The nozzle is removed from the
adapter by pulling the collar away. Before removal from the vehicle adapter, the nozzle handle should be returned to the
closed position If, in an emergency situation, the nozzle is not returned to the closed position before removal, the dry
quick-disconnect action of the nozzle will close its internal valve automatically.
When servicing a vehicle not equipped with a CCR adapter, the gravity fill adapter is attached to the discharge end of the
CCR Nozzle. After attaching the adapter nozzle, the CCR Nozzle handle is moved to the open position. The gravity fill
adapter discharge end is inserted into the vehicle and the handle is moved forward to start the fuel flow. Releasing the
handle will stop the fuel flow.
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