MIL-PRF-52747F(AT)
mittens can easily couple it to a vehicle adapter and operate it (see 4.4.2). If the nozzle's
installation requires that its bottom surface be used as a handhold during removal or installation,
a nonslip grasp surface (e.g., grooved, knurled, or frictional) shall be provided (see 4.4.2). The
nozzle shall be suitable for operation under all possible operating conditions from 0 to 115
gallons per minute (gpm) flow rate and 0 to 125 pounds per square inch (psi) nozzle inlet
pressure. The nozzle shall withstand an internal pressure of 225 psi without damage. With the
nozzle connected to a closed-circuit adapter and the flow control valve in the open position, it
shall be possible to visually determine when the regulator has shut off fuel flow (see 4.4.4.1,
4.4.4.2, and 4.4.4.15).
3.6.1 Coupler. The nozzle shall include a quick-disconnect, automatic-shutoff coupler
suitable for connecting the nozzle to any adapter conforming to Drawing 13219E0479
(see 4.4.2). The coupler shall automatically engage the adapter with a mechanical lock which
eliminates the need for the operator to maintain any continuous manual holding force. When the
nozzle is not coupled to an adapter, a seal which functions automatically shall make it impossible
to initiate or maintain flow through the nozzle. Fuel spillage shall not occur when the nozzle is
uncoupled from the adapter when the fuel flow control valve is closed. Fuel spillage shall not
exceed 10 cubic centimeters (cm3) when the nozzle is uncoupled from the adapter while flowing
at the maximum flow rate (see 4.4.4.5, 4.4.4.6, and 4.4.4.7). The coupler shall include a dust
plug or cap to prevent dust from entering that portion of the nozzle which engages the adapter.
The dust plug or cap shall be adequately secured to the nozzle to prevent loss and shall withstand
a pull test of 75 pounds (lbs).
3.6.2 Pressure regulation. The nozzle shall include an integral means to regulate the
pressure at the interface between the nozzle and a closed-circuit adapter. The pressure regulator
shall maintain the interface pressure of 15 pounds per square inch gauge (psig) nominally for
nozzle inlet pressures from 20 to 125 psi (see 4.4.4.3). When the nozzle is connected to a closed-
circuit adapter discharging through a fixed orifice, the pressure regulator shall function as a
means of flow regulation. When the nozzle is tested as specified in 4.4.4.3, 4.4.4.16, and
4.4.4.19, the regulated flow shall be within the limits required. When the nozzle inlet pressure is
less than that required to produce an interface pressure of at least 15 psig, the pressure regulating
device shall remain in the full open position.
3.6.3 Flow control valve. The nozzle shall include a flow control valve which allows
manual control of the flow rate from no flow to full flow. The movement of the flow control
valve forward, will activate the flow rate from no flow to full flow. The flow control valve shall
remain in the full closed or full open position as selected by the operator without the need of
maintaining a continuous manual holding force. The flow control valve shall be protected from
accidental actuation by providing the valve with interlocks so that extra movement or the prior
operation of a related or locking control is required. The minimum clearances shall be a hand
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