MIL-DTL-82068D
3.7.4.1 Sizes A and B. Size A and size B pesticide sprayers shall be furnished with a
12-volt electrical system, including a starter, battery charging generator of not less than 5 Ampere
rating, regulator, ammeter; and a dry-charged (less filling of electrolyte) or maintenance-free
battery as specified (see 6.2).
3.7.4.1.1 Size C. Size C pesticide sprayers shall be furnished with a magneto type
ignition system, including manual cranking or pull-rope starting capabilities.
3.7.4.2 Electromagnetic radiation suppression. When specified (see 6.2), electro-
magnetic radiation from the sprayer shall be suppressed to conform to the recommended limits of
SAE J551-1.
3.7.5 Pesticide pump. The pump shall be a positive displacement piston type with not
less than two ceramic or porcelain-lined cylinders. Piston cups, o-rings, valve seats, disks, and
cylinder wearing surfaces shall be capable of not less than 100 hours of pumping pesticide
(see 4.5.3), without deterioration resulting in breakage or leakage. Valve cages, if required
(see 6.2), and valve springs shall be stainless steel. Valve seats, disks, and or poppets shall be
the manufacturer's current design and shall be capable of sustaining a minimum of 100 hours of
operating time. Bearings designed for a minimum of two years of service shall be used.
Pressure-lubricated bearing surfaces shall be protected from dust, dirt, and abrasive
contaminants.
3.7.6 Piping system. The piping system shall be designed for continuous circulation of
pesticide from the pesticide storage tank through the pump suction strainer, pump, and pressure-
regulating valve assembly, to the distribution piping, with surplus flow return to the tank.
Discharge into the tank shall be designed to prevent entrainment of air. Takeoffs shall be made
from the high pressure section of the piping system to supply the hose reel, the tank refiller
assembly, and the spray boom connections. Points of connection for hose reel, refiller assembly,
and spray boom shall be provided with means for individual disconnection. A pump suction line
strainer with removable basket shall be installed in an accessible location.
3.7.6.1 Bypass pressure-regulating valve assembly. A pressure regulation system
designed to control pressure fluctuations to less than 50 psi shall be provided. The bypass
pressure-regulating valve assembly shall consist of an adjustable unloading-type pressure
regulator, or an adjustable bypass pressure-regulating valve with a pressure-reducing valve when
required (see 6.2), and shall be provided with an inlet connection from the pump, a discharge
connection to the high pressure section of the piping system, and a surplus pesticide overflow
discharge connection to the storage tank. An easily adjustable pressure control shall be
incorporated for maintaining the operating pressure of the high pressure piping section at any
desired pressure over the operating pressure range of the equipment furnished. The pressure
control shall be self-locking, or shall be provided with a locking device to prevent movement
caused by vibration.
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