A-A-50310A
3. SALIENT CHARACTERISTICS.
3.1 Interface and physical dimensions. Spray guns supplied to this CID shall be as specified herein.
3.2 Materials. Materials used for the spray gun shall be free from defects that would adversely affect the performance or maintainability of individual components or of the overall assembly. Materials not specified herein shall be of the same quality used for the intended purpose in best commercial practices (see section 4). Suitable protection against galvanic corrosion shall be provided when dissimilar metals are used.
3.3 Design and construction. The spray gun shall be a complete functional assembly, consisting of a gun and a cup. The spray gun shall be new and of the manufacturer's latest commercial design. The gun shall be designed for
heavy-duty commercial and industrial production use. The spray gun shall be for hand-held operation and designed with an air pressure, fluid material atomizing and mixing cap. The type S gun shall be designed for siphon feed. The type P gun shall be designed for pressure feed. All valves used in either the type S or type P spray guns shall be replaceable.
3.3.1 Spray gun body. The spray gun body shall be an aluminum alloy drop forging with a hook provided at the top of the body (see figure 2).
3.3.2 Spray head. The spray head shall be brass or bronze and of the detachable type. The interior and exterior surfaces shall be smooth and finished with a chrome or nickel plating.
3.3.3 Air caps and fluid nozzles. Air caps and nozzles meeting the requirements of table I shall be provided with each spray gun. For type S, the air caps and nozzles shall be external mix siphon feed type. The spray gun shall be provided with all the hardware necessary to perform as either a type S size 001 or a size 002 spray gun. The conversion shall be accomplished by changing only the air cap. The necessary hardware shall be provided for the spray gun to perform as a type S or a type P spray gun.
3.3.4 Air cap. The air cap shall be fabricated from brass or bronze with smooth exterior and interior surfaces that are chrome or nickel plated. The air cap shall be self-centering on the nozzle and fitted to the spray gun head with a threaded retaining ring.
3.3.5 Nozzle. The nozzle shall be fabricated from stainless steel and shall have a Rockwell C hardness of 48-60. The nozzle shall be ground or lapped on all seating surfaces and air passages.
3.3.6 Siphon tube assembly (type S gun). The siphon tube assembly shall consist of the spray gun cup lid, quick- release clamp, gasket, and siphon tube for delivering paint from the cup into the spray head. The assembly shall attach to the spray head with a 0.375 inch (9.53 mm) female national standard straight pipe thread mechanical (NPSM) with a 30 degree tapered seat.
3.3.7 Spray gun cup. A heavy duty, one-quart capacity cup shall be provided shall be provided with each spray gun. The cup shall have an aluminum alloy body with an external stainless steel or aluminum alloy reinforcement ring permanently attached to its bottom. The outside diameter of the cup shall be not more than 4.625 inches (117.48 mm) and the smallest throat diameter shall be not less than 3.25 inches (82.55 mm). The material wall thickness of the cup shall be no less than 0.040 inches (1.02 mm). The cup interior shall have a 63 microinch (1.6 microns) (XXX mm) or finer arithmetic average surface roughness, and shall contain no burrs or slivers.
3.3.7.1 Type P spray gun cup. The type P spray gun, in addition to the material and dimensional requirements
of 3.3.7, shall have a cup lid that includes an air regulator adjustment, a fine air flow volume adjustment valve, and a pressure gage (air). A pop-off pressure safety relief valve, vented to atmosphere, shall be mounted on the gun cup lid or at the base of the gun handle. The air regulator shall be capable of regulating within 5 psig the air pressure inside the cup at any point within the full-range scale of the air pressure gage. The cup shall be capable of withstanding internal air pressure of 50 psig without a pressure drop of more than 2 psig during a two-minute period. The safety relief valve shall release pressure at not less than 50 psig and not more than 60 psig and shall reset itself when pressure is reduced below the valve release pressure.
3.3.8 Paint valve. The trigger-operated paint valve shall be a stainless steel needle valve. The valve shall be ground on all seating surfaces. The valve packing shall be chrome-treated leather, fiber, or synthetic material. Flow rate
shall be adjustable. The paint valve shall be self-closing when the trigger is released.
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