Page 64 - KT_Catalog

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64 KKTCA0408
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for hydraulic fttings. For this reason, as a general rule we
do not recommend the use of one-piece crimped hydraulic
fttings with Kuri Tec hoses.
In fgures 2A and 2B above, two styles of crimping die have
been used successfully. The ferrules and fttings are prop-
erly matched in length.
In Fig. 2C, the ferrule is much shorter than the barbed
insert. Without the protection of the ferrule, repeated harsh
fexing of the hose at the ftting can damage the tube. In
addition, the short ferrule does not take full advantage of
the sealing or retention properties of the barbed insert.
In fgure 2D, there are two potential problems: 1) The
excessively-long ferrule can reduce the inside diameter of
the hose just beyond the ftting; and 2) a single-barb ftting
is not the ideal insert for a crimped ferrule. Because of the
increased depth of the single barb, the tube can be cut by
the force of the crimping before suffcient compression is
exerted on the shank of the ftting.
Compression Fittings
Compression fttings depend solely on contact with the
outer surface of the tubing to provide sealing and holding
power. There is no seal on the inner surface of the tubing.
With the exception of 220/221 Series LLDPE tubing, we do
not recommend the use of compression fttings with Kuri
Tec hose and tubing. To work properly, the material must
be hard and smooth and there must be no yarn reinforce-
ment layer.
Fitting suggestions for Kuri Tec® spray hoses
In addition to the properly installed fttings shown in Fig. 1A,
1B, 2A and 2B above, we also suggest the use of a
two-barb clamped ftting when high pressures are involved.
The double-barb ftting, held in place by two properly
positioned clamps, provides excellent ftting retention and
It is extremely important that the ftting and hose or tubing
be properly matched in size and type. The insert should
always be slightly larger than the tubing to create a slight
expansion of the tube and provide a good consistent seal.
If a clamp or ferrule is used to compress the hose, caution
must be used to prevent over-crimping the ferrule or
over-tightening the clamp. More pressure does not
necessarily improve ftting retention.
We do not recommend the use of reusable fttings unless
the hose and ftting have been specifcally designed to be
compatible and have been thoroughly tested in combina-
tion prior to use.
Clamps over barbed fttings
In the illustrations above, the clamps are properly
positioned in Figure 1A and 1B, directly over the middle
barbs and behind the frst barb. This is extremely important
in the case of single-barb fttings, as shown in Figure 1B,
since the barb is generally much larger than the shank of
the ftting. The compressed material cannot pass over the
barb when under tension, thus securely holding the ftting
to the hose.
In Figures 1C and 1D, the clamp has been improperly
positioned too close to the end of the ftting. In Figure 1C,
only the barb nearest the end of the ftting is effective in
maintaining ftting retention. The frst two barbs serve no
purpose whatsoever in providing ftting retention or leak
resistance. In Fig. 1D, the situation is even worse, since the
clamp can very easily cut the core tube over the enlarged
barb, leading to leakage and subsequent cover blisters or
bursts.
When choosing multi-barb fttings for use with Kuri Tec
hose, as in Fig. 1A and 1C, it is important that the barbs not
be too deep. The core tubes in Kuri Tec hoses are generally
somewhat harder than conventional rubber tubes and
therefore the material cannot fow into the deep barb, as it
would with a soft rubber compound.
Ferrules crimped over barbed fttings
When properly crimped, a metal ferrule over a multi-barbed
ftting can provide excellent ftting retention and leak
resistance. However, excessive crimping pressure can
damage the core tube, leading to hose failure. Extreme
care must also be taken to control the crimping diameter
Unacceptable Acceptable
Fig. 2A Fig. 2B
Fig. 2C Fig. 2D
Compression Sleeve Push-to-connect
Fitting Suggestions for Kuri Tec® Hose & Tubing
Fig. 1C Fig. 1D
Fig. 1A Fig. 1B
FITTING SUGGESTIONS