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TM 10-4930-245-13&P
1-12. EQUIPMENT DATA.
GENERAL
Type:
MIL-N-52747D(ME), Type IA
Standard Service, with 2 inch quick-disconnect
coupler.
Weight:
8 lb (3.7 kg) Maximum
Maximum Dimensions:
10 inches L, 4 inches W, 9 inches H; not including Strainer Assembly and
Coupling.
Nozzle Disengagement Force:
10 to 32 lb
Environmental Conditions:
Operating Temperature Range: -25°F to + 140F.
Operating Relative Humidity: Zero to 100%.
Sand and Dust: Exposure to desert environment.
Storage Temperature Range: -50°F to + 150°F.
Section III. PRINCIPLES OF OPERATION
1-13. 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 flow from 15 to 125 psig
nozzle inlet pressure.
The nozzle position 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, the pressure difference at the nozzle outlet is reduced to zero and flow ceases. 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.
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