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PrimoChill Black Nylon 1/4 NPT threaded elbow- 1/2 |
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Our Single Barb Fittings Features
and Clamp Dynamics
The threads are molded in precision-ground cavities
resulting in perfectly matched threads at the parting line. This produces the cleanest, most
accurate molded thread possible.
Why our fittings are better.
Our single-barbed fittings are designed so the
mold parting line stops at the
base of the barb. The ridge and the barb's conical surface
are free of the molded-in leak path
present in multiple barb fittings. The conical surface is glass-like
and smooth allowing excellent sealing.
The straight barb shaft provides space for the hose to relax
behind the barb causing the clamp
to work like a drawstring. This forces the hose diameter to
become smaller than the flare of the
fitting's barb. If the tubing swells from internal pressure
(near burst), the clamp will be pulled
up tight to the back of the barb and a tight seal will be
maintained.
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Single Barb Fitting
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Other
Barb Fitting
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Clamp
placement on a single barb fitting. Clamp positioning in the recess behind the barb allows for tubing compression anterior to the barb and results in a secure seal with without excessive clamp pressure |
Clamp
placement on a Multiple barb fitting. Clamp can only be placed over barb. In general, much more clamp pressure is required to secure a seal than that necessary with a single barb fitting |
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that result in leakage. With multiple barb fitting designs, it is virtually impossible to avoid creating
parting lines on the barb surface. These parting lines create leak paths which become more
pronounced as the mold tooling wears.
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Multiple Barb Fitting - Clamp Dynamics
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1. Clamping on a barb's outer radius, in
an attempt to force the tube down behind the barbs can cause damage. The sharp edges of the barbs become rounded resulting in less bite into the tubing. 2. Clamping pressure causes the tube to flare out behind the clamp and barbs located behind the clamp will have little or no effect. |
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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.)
