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|  MIL-T-62032H
pressure servicing and closed-circuit fuel servicing nozzles. The control system shall include a
pump bypass valve, a pressure sensing venturi, dispensing hose reel shutoff valves, a
filter/separator water slug discharge control, and operating controls. The pressure sensing
venturi shall be located downstream of the filter/separator.
3.8.9.1 Pneumatic operation. The control system shall be pneumatically operated from
the truck air brake system. Safety provisions shall be incorporated that will prevent loss of air in
the air brake system in the event of failure of any portion of the control system. Components
which operate with fuel and vehicle air under pressure shall be so designed that leakage of fuel
into the air system or leakage of air into the fuel system cannot occur. Where possible,
components or valves which operate with only one medium (either fluid or pneumatic) shall be
used. The pneumatic power system shall be essentially a static system which releases air only
when the controls are operated and only to the extent necessary to purge the components. Under
no condition shall air be vented into the tank. The bottom loading system pneumatic and fuel
components shall be protected with screens, filters, or other devices to prevent contaminants
from entering critical components. All pneumatic controls shall be compatible and designed to
provide reliable operation in the available air pressure range.
3.8.9.1.1 Pneumatic lines. All pneumatic lines shall be of corrosion-resistant metal and
shall be secured to the tank or frame and protected from damage. All lines exposed to possible
ground or brush contact shall be protected with skid plates. All pneumatic lines that pass
through holes shall be grommeted against chafing.
3.8.9.2 Control panel. The pumping system shall incorporate a control panel on the
driver's side of the truck in the underslung compartment. The control panel shall be located
within easy reach and shall be clearly visible to an operator standing on the ground. The control
panel shall be easily removable or accessible from the rear for maintenance purposes. The
control panel shall contain the throttle speed selector control, selector valve control, dispensing
hose reel shutoff valve controls, underwing or pressure servicing nozzle pressure gage,
filter/separator differential pressure gage, contamination monitor differential pressure gage,
pump discharge pressure gage, and pumping compartment light switch. The controls shall be
arranged for the maximum convenience of the operator. All controls shall be protected from
damage and inadvertent operation.
3.8.9.3 Operating controls. The operating controls shall include a selector valve, a
throttle control, a deadman control, dispensing hose reel shutoff controls, and operating and
emergency controls for the automatic flow control valve.
3.8.9.3.1 Selector valve. A selector valve shall be the primary operating control of the
pumping system. The selector valve shall have positions for overwing, pressure servicing, and
defuel. The selector valve shall provide for automatic adjustment of the pumping system
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