T-73
Never place a clamp over the large diameter of the barb.
Clamps work best when tightened around the recess behind
the barb. For best results place the clamp behind the barb and
over the anti-rotation devices. The anti-rotation devices are
small oval shaped raised areas which inhibit hose rotation on
the barb. Rotation of the hose on the barb causes many of the
leaks that occur with other fittings.
PLASTIC FITTINGS FOR FLEXIBLE TUBING & HOSE
NYLON, POLYPROPYLENE
PVDF
Important Properties of PVDF Products
High Mechanical Strength
and Toughness
High Abrasion Resistance
Chemical and Solvent Resistance
Weathering Resistance
High Thermal Stability
High Dielectric Strength
UV Light and Radiation Resistance
Fungi Resistance
PVDF has been used as a pipe liner in chemical
processing plants since its introduction nearly
30 years ago. It has been used extensively in the
paper and paper pulp industries, where equipment
is constantly exposed to high concentrations of
Chlorine and Chlorine Dioxide. In these applications
the permeation resistance of PVDF components far
surpassed that of PTFE.
PVDF products are used extensively in silicon
microcircuit fabrication. Processes in this industry
commonly use deionized water, a fluid that is highly
corrosive to steel. The deionized water is often
sanitized through the injection of ozone and
exposure to UV light, both of which can seriously
degrade the integrity of materials less durable than
PVDF.
Outstanding Characteristics of PVDF Products
PROPER CLAMP PLACEMENT
Clamps must be used with all fittings which have Anti-Rotation Devices
PATENT PENDING
ANTI-ROTATION
DEVICE
F-FT-A
ANTI-ROTATION
DEVICE
PRICE CLAMPING RANGE
MODEL NO. (10/PK) (CLOSED-OPEN)
FT-CLAMP-1 $14 0.312-.875"
FT-CLAMP-2 14 0.500-1.00"
FT-CLAMP-3 14 0.625-1.25"
FT-CLAMP-4 14 0.625-1.500"
CLAMP
TUBING
PARTING LINE
BARB
FT-CLAMP
$
12
Basic Model
ALL MODELS AVAILABLE
FOR FAST DELIVERY!
T
OMEGA’s threads are molded in precision-ground cavities
resulting in perfectly matched threads at the parting line.
While this method is the most costly, it produces the
cleanest, most accurate molded thread possible.
OMEGA’s single-barbed fittings are made so that the moldedin parting line stops at the base of the barb. The ridge and the
conical surface are free of the molded-in leak path. The
conical surface on the fitting is smooth and glass-like, for
excellent sealing.
Why Multiple Barb Fittings Fail
Tooling mismatches often occur in poor-quality fittings causing
mismatched threads and barbs and resulting in leakage.
Tooling cannot be designed to avoid a parting line on multiple
barb fittings. This parting line creates a leak path which
becomes more pronounced as the tool wears.
TYPICAL CLAMPING POSITION
1. Clamping on top of barbs in attempt to force the tube down
behind the barbs can cause damage. It will round off the sharp
edges of the barb and cause it to bite less into the tube.
2. The clamping pressure causes the tube to flare out behind
the clamp. Barbs located behind the clamp will have little or
no effect.
Multiple barbs are typically in close succession. This prevents
the tubing from relaxing to its original size, which is essential
to the barb’s performance. If the tubing does not relax behind
the barb, the barb is rendered useless, as shown above.
(Note the bridging effect.)
ADDITIONAL NOTE: Brass fittings are machined and do not have the problem of molded-in parting lines.
However, brass fittings are usually designed with multiple barbs and have the other problem characteristics
shown above. In addition, machinable brass contains free lead. Brass parts cannot be used on any system if
internal heavy metals are undesirable or dangerous
.
Relaxed tubing behind the
barb is essential to the barb’s
ability to bite into the hose.
Clamping the relaxed hose behind the barb causes the
clamp to work like a drawstring, forcing the diameter of the
hose to become smaller than the flare of the fitting barb.
If the tubing swells from internal pressure (near burst), the
clamp will be pulled up tight to the back of the barb and the seal
will be maintained. When the clamps are placed over the
OMEGA
®
exclusive anti-rotation device the tubing cannot be
freed by a twisting motion.
CLAMP
FITTING
PARTING LINE
TUBING
FITTING
PARTING LINE
CLAMP
LEAK PATH
TUBING
Quality Tubing and Hose Fittings Features...
T-74
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
EPG05
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