specifications which define the materials andtechniques.BRAZED CONNECTORSSilver-brazed connectors are commonly usedfor joining nonferrous (copper, brass, and soon)piping in the pressure and temperature rangewhere their use is practical. Use of this type ofconnector is limited to installations in which thepiping temperature will not exceed 425°F and thepressure in cold lines will not-exceed 3,000 psi.The alloy is melted by heating the joint with anoxyacetylene torch. This causes the alloy insertto melt and fill the few thousandths of an inchannular space between the pipe and the fitting.A fitting of this type which has been removedfrom a piping system can be rebrazed into asystem, as in most cases sufficient alloy remainsin the insert groove for a second joint. New alloyinserts may be obtained for fittings which do nothave sufficient alloy remaining in the insert formaking a new joint.FLARED CONNECTORSFlared connectors are commonly used in fluidpower systems containing lines made of tubing.These connectors provide safe, strong, dependableconnections without the need for threading,welding, or soldering the tubing. The connectorconsists of a fitting, a sleeve, and a nut (fig. 5-15).The fittings are made of steel, aluminum alloy,or bronze. The fitting used in a connection shouldbe made of the same material as that of the sleeve,the nut, and the tubing. For example, use steelconnectors with steel tubing and aluminum alloyFigure 5-15.—Flared-tube fitting.connectors with aluminum alloy tubing. Fittingsare made in union, 45-degree and 90-degreeelbow, tee, and various other shapes (fig. 5-16).Tees, crosses, and elbows are self-explanatory.Universal and bulkhead fittings can be mountedsolidly with one outlet of the fitting extendingthrough a bulkhead and the other outlet(s) posi-tioned at any angle. Universal means the fittingcan assume the angle required for the specificinstallation. Bulkhead means the fitting is longenough to pass through a bulkhead and isdesigned so it can be secured solidly to thebulkhead.For connecting to tubing, the ends of thefittings are threaded with straight machine threadsto correspond with the female threads of the nut.In some cases, however, one end of the fitting maybe threaded with tapered pipe threads to fitFigure 5-16.—Flared-tube fittings.5-13
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