A-A-55748
3.9 Strainers.
Two strainers shall be provided. The two strainers shall be
of equal dimensions located at different points easily accessible in the
discharge line between the entry to the dip tube and the entry ports of the
cut-off valve. One strainer shall be provided in the cut-off valve. The
strainers shall be made of stainless steel, bronze, copper alloy, or any
material of equal or superior durability and corrosion resistance. The
strainers shall have sufficient structural strength or shall be mounted in
such a way that they will not be subject to accidental puncture or collapse.
They shall be easily removable and replaceable without special tools, and it
is preferable that they be pushed into place rather than screwed. Flow
through the strainers shall be from the outer surface inward. The strainers
shall allow easy passage of liquid.
3.10 Hose. Unless otherwise specified (see 7.2.4), hose shall be of
polychloroprene rubber, polyvinyl chloride or similar material and shall be
resistant to pesticide formulations or oils. A length 5 feet (1.5 m) with an
inside diameter between 0.25 to 0.375 inch (6.4 to 9.5 mm) shall be provided
with each sprayer. The hose shall have one or more plies of reinforcement
made from cotton duck, cotton yarn, or synthetic fiber, of at least two-end
yarn. The material shall be evenly and firmly woven and free from unsightly
defects such as dirt, knots and lumps, as well as from irregularities of
twist. The tube and cover shall be free from pitting and shall be uniform in
thickness. The reinforcement shall be lapped (not sewn) at least 0.5 inch
(13 mm) and shall be well frictioned on both sides with a rubber compound that
shall firmly join the plies to the rubber tube and cover and to each other.
3.11 Hose connect ions. Hoses shall be retained on connections or couplings
preferably by the worm-drive clamp. The connections shall have no sharp
edges and a minimum of extended projections liable to catch on clothing or
other objects. Threaded terminal connections shall have finished, hexagonal
faces or opposing flattened surfaces. Nuts of adequate strength and size may
be permitted if couplings are fabricated to enable air-tight and liquid-tight
joints to be made by thumb pressure at the highest designated operating
pressure.
3.12 Cut-off valve .
ruction.
3.12.1
All metal parts of the valve body shall be made of
brass, bronze, anodized aluminum, or stainless steel. The valves shall be
so constructed that inner and outer parts are readily accessible for frequent
cleaning without the use of special tools.
3.12.2 Connections. Valves shall be equipped with screw threads at inlet
and outlet ports. The outer surfaces of the valve, adjacent to the screw
threads, shall have opposing faces, to permit the use of a wrench, if tools
are required for its removal. Knurled faces or wing nuts of adequate shape
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