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|  MIL-S-64052
bottom exterior of the cup no larger than one (1) inch diameter. The exterior
reinforcing ring shall be at least .023 inch thick. The cup interior shall have a
sixty-three (63) microinch or finer arithmetical average (AA) surface roughness and
shall contain no burrs or slivers. The cup shall be capable of withstanding
internal air pressure of 50 psig for a period of not less than two (2) minutes
without a pressure drop of more than 2 psig. The pop-off pressure safety relief
valve shall have a pressure release point of not less than 50 psig and not more than
60 psig. The pop-off pressure safety relief valve shall automatically reset itself
to the same release point immediately upon reduction of pressure below this release
point as defined above. The material wall thickness of the spray gun cup shall be
at least 0.040 inch.
3.13.3 Spray head. The spray head shall be fabricated from brass or bronze base
metal and shall be of the detachable type. The head shall be accurately machined to
provide correct alignment and support of the nozzle components. The interior and
exterior surfaces shall be smooth and finished with a chromium or nickel plating.
3.13.4 Air Cap. The air cap shall be fabricated from brass or bronze base metal.
The cap shall have smooth exterior and interior surface which is chromium or nickel
plated. The air cap shall be self-centering and shall be fitted to the spray head
with a retainer ring or other suitable means. The internal orifice of the fluid
nozzle must be centered to the functional exterior surface of the fluid nozzle
within plus/minus 0.001 inch. The annular radial opening between the center hole of
the air cap and the functional external surface of the fluid nozzle, shall not
deviate more than 0.0015 inch when measured around the annular radial opening (see
Figure 4, 3.2 and 3.13.5).
3.13.5 Fluid nozzle. The fluid nozzle shall be fabricated from stainless steel
base metal and shall have a Rockwell C hardness of 48-60. The fluid nozzle shall be
ground or lapped on all seating surfaces and air passages. The fluid nozzle
assembly shall be removable to facilitate cleaning and repair. The internal orifice
of the fluid nozzle must be centered to the functional exterior surface of the fluid
nozzle within plus/minus 0.001 inch. The annular radial opening between the center
hole of the air cap and the functional external surface of the fluid nozzle, shall not
deviate more than 0.0015 inch when measured around the annular radial opening (see
Figure 4, 3.2 and 3.13.4).
3.13.6 Valves.
All valves shall be replaceable.
3.13.6.1 Liquid material valve. The trigger operated liquid material valve shall
be a stainless steel needle-type valve. The valve shall be ground on the seating
surfaces. The needle valve packing shall be of chromed treated leather, fiber, or
synthetic material. The valve shall be connected with an adjustable screw mounted
at the back of the gun to permit changing the quantity of liquid material passage
through the fluid orifice when the valve is opened. Packing shall be impervious to
degradation from coatings, enamels, lacquers, paints, solvents and thinners. The
liquid material valve shall be self-closing when the trigger is released.
3.13.6.2 Air valves. The trigger operated air valve shall be a cartridge-type
valve or a type employing a replaceable valve seat. The valve stem packing shall
be chromel treated leather, fiber, or synthetic material. The air valve shall be
self-closing when the trigger is released.
3.13.6.3 Pattern control valve. A spray pattern control valve, to be easily
operated from the back of the gun, shall be provided to infinitely adjust and change
the spray pattern from round to fan shaped, or vice versa (see Figure 1).
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