A-A-50310A
3.3.9 Air valve. The air valve shall be trigger-operated with a replaceable valve seat. The valve packing shall be chrome-treated leather, fiber, or synthetic material. The air valve shall be self-closing when the trigger is released.
3.3.10 Pattern control valve. An adjustable pattern control valve shall be provided to infinitely regulate the spray pattern from round to elliptical and vice versa.
3.3.11 Trigger. The trigger shall control both the air and paint valves and shall operate to permit air flow before paint flow. Releasing the trigger shall cause the paint valve to close before the air flow is stopped. The trigger material shall be corrosion-resistant metal or metal plated to resist corrosion.
3.3.12 Connections. The spray gun shall be provided with paint and air connections. The paint inlet connection shall be a 0.375 inch (9.53 mm) National Pipe Straight Mechanical (NPSM) male thread with a thirty (30) degree internal tapered seat, and the connection for the air hose shall be a 0.250 inch (6.35 mm) male NPSM with a thirty (30)
degree internal tapered seat. The air hose fitting shall be detachable from the butt of the handle grip and shall be fabricated from drawn brass rod.
3.3.13 Air leakage. The valve packings and seals, when subjected to 100 psig pressure, shall allow no more than a
10 psig drop in one minute after pressure cut-off.
3.3.14 Hydrostatic pressure. The spray gun with the cup removed shall not be damaged and shall perform as specified herein after being subjected to a hydrostatic pressure of 250 psig minimum for a period of not less than one minute.
3.3.15 Durability. The spray gun and components shall not be damaged and shall perform as specified herein after being subjected to 10,000 full-stroke trigger actuations while under an air pressure of 60 psig.
3.4 Performance and product characteristics. The paint spray gun and all its components shall perform in accordance with the requirements specified herein and in table I.
3.4.1 Sprayable material. The spray gun shall be capable of spraying liquid materials such as enamels, lacquers, primers, shellacs, varnishes, polyurethanes, stains, paints, and the two-part aliphatic polyurethane coatings, thinned to a viscosity as specified in table I.
3.4.2 Sprayable material finish. The type S and type P guns, with the appropriate air cap and nozzle combinations, shall provide a coating finish equal to or better than the passenger car finishes provided by the major domestic automobile manufacturers when spraying black to charcoal color pigmented acrylic paint over a 3-foot by 3-foot square prepared metal surface. Viscosity shall conform to table I.
3.4.3 Spray pattern. The spray gun, in any configuration, shall produce symmetrical round and elliptical spray patterns (see figure 1) meeting the requirements of table I. The effective area of the spray pattern is that area which has 100 percent paint coverage. The pattern shall be produced using a black to charcoal color alkyd gloss enamel exterior automotive paint thinned to the required viscosity for both type S and type P configurations in accordance with table I. The spray pattern shall be produced, without paint runs within the paint area, with the spray gun held stationary in a perpendicular position 7.5 (190.50 mm) to 8.5 inches (215.90 mm) from the sprayed surface, and the paint sprayed for not more than one second. The type P spray gun shall produce acceptable patterns on horizontal, flat, non-porous surfaces positioned both below the spray gun and above the spray gun (overhead).
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