Kuri-Tec tubing and hose - Kuriyama of America

®FITTING SUGGESTIONSFitting Suggestions for Kuri Tec ® Hose & TubingIt is extremely important that the fitting and hose or tubingbe properly matched in size and type. The insert shouldalways be slightly larger than the tubing to create a slightexpansion of the tube and provide a good consistent seal.If a clamp or ferrule is used to compress the hose, cautionmust be used to prevent over-crimping the ferrule orover-tightening the clamp. More pressure does notnecessarily improve fitting retention.We do not recommend the use of reusable fittings unlessthe hose and fitting have been specifically designed tobe compatible and have been thoroughly tested incombination prior to use.Clamps over barbed fittingsdiameter for hydraulic fittings. For this reason, as ageneral rule we do not recommend the use of one-piececrimped hydraulic fittings with Kuri Tec hoses.Fig. 2AFig. 2BIn figures 2A and 2B above, two styles of crimping diehave been used successfully. The ferrules and fittings areproperly matched in length.Fig. 1AFig. 1CIn the illustrations above, the clamps are properlypositioned in Figure 1A and 1B, directly over the middlebarbs and behind the first barb. This is extremelyimportant in the case of single-barb fittings, as shown inFigure 1B, since the barb is generally much larger thanthe shank of the fitting. The compressed material cannotpass over the barb when under tension, thus securelyholding the fitting to the hose.In Figures 1C and 1D, the clamp has been improperlypositioned too close to the end of the fitting. In Figure1C, only the barb nearest the end of the fitting is effectivein maintaining fitting retention. The first two barbs serveno purpose whatsoever in providing fitting retention orleak resistance. In Fig. 1D, the situation is even worse,since the clamp can very easily cut the core tube over theenlarged barb, leading to leakage and subsequent coverblisters or bursts.When choosing multi-barb fittings for use with Kuri Techose, as in Fig. 1A and 1C, it is important that the barbsnot be too deep. The core tubes in Kuri Tec hoses aregenerally somewhat harder than conventional rubbertubes and therefore the material cannot flow into the deepbarb, as it would with a soft rubber compound.AcceptableFig. 1BFig. 1DUnacceptableFerrules crimped over barbed fittingsIn Fig. 2C, the ferrule is much shorter than the barbedinsert. Without the protection of the ferrule, repeatedharsh flexing of the hose at the fitting can damage thetube. In addition, the short ferrule does not take fulladvantage of the sealing or retention properties of thebarbed insert.In figure 2D, there are two potential problems: 1) Theexcessively-long ferrule can reduce the inside diameterof the hose just beyond the fitting; and 2) a single-barbfitting is not the ideal insert for a crimped ferrule. Becauseof the increased depth of the single barb, the tube can becut by the force of the crimping before sufficient compressionis exerted on the shank of the fitting.Compression FittingsCompression fittings depend solely on contact with theouter surface of the tubing to provide sealing and holdingpower. There is no seal on the inner surface of the tubing.With the exception of 220/221 Series LLDPE tubing, wedo not recommend the use of compression fittings withKuri Tec hose and tubing. To work properly, the materialmust be hard and smooth and there must be no yarnreinforcement layer.Fitting suggestions for Kuri Tec ® spray hosesIn addition to the properly installed fittings shown in Fig.1A, 1B, 2A and 2B above, we also suggest the use of atwo-barb clamped fitting when high pressures are involved.When properly crimped, a metal ferrule over a multibarbedfitting can provide excellent fitting retention andleak resistance. However, excessive crimping pressurecan damage the core tube, leading to hose failure.ExtremePlease refercaretomustthealsobackbepagetakenfortothecontrollocationthe crimpingof your nearest The warehouse double-barb for fitting, availability held in of place products/sizes by two properly shown.positioned clamps, provides excellent fitting retention andBecause we continually examine ways to improve our products, we reserve the right to alter specifications OR DISCONTINUE PRODUCTS without prior notice.64 KKTCA0408Fig. 2CCompression SleeveFig. 2DPush-to-connect