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7
Our Single Barb Concept
Many designers are not aware of the benefits of using a single
barb versus a multi-barb fitting, but the barb design greatly
affects the security of your tube connection.
Because of the shape of a barb, it is impossible to injection mold
any but the first barb without a parting line. The parting line
creates a potential leak path that becomes more pronounced as
the tooling wears, increasing the likelihood of failure.
Two other problems exist with multiple barb fittings. First,
it is impossible to fabricate tooling that creates a perfectly
sharp edge on each barb of a molded multi-barb fitting – a
feature critical to the performance of the connection. Second,
multiple barb fittings do not allow the tubing to relax behind
the first barb. Because the tubing “bridges” from barb to barb
it is not allowed an uninterrupted interface with the fitting.
This results in compromised pressure and tensile capacities.
Value Plastics
®
single barb design avoids these shortcomings.
Our expert tooling design assures the sharpest edge
possible allowing the barb to “bite” into the tubing. Then, the
cylindrical surface behind the barb allows the tubing to relax
against the fitting. The result is a connection with excellent
tensile and pressure performance.
MULTI BARB
MOLD PART LINE:
Potential leak path on
critical sealing surfaces.
Bridging effect of multiple
barbs prevents tubing
from relaxing behind barb.
Tool design results in radius
on corner of barb. Worn
or poorly fit tool also prevents
“bite”, allowing for potential
part failure.
The data presented here is for reference only. It was compiled to provide our customers with a means of comparing the characteristics of components at the time of publication. The particular conditions of your
use and application of our products are beyond our control. Thus, it is imperative that you test our products in your specific application to determine their suitability. All information is provided without implied or
expressed warranty or guarantee by Value Plastics
®
or other manufacturers. None of the information provided constitutes a recommendation or endorsement of any kind by Value Plastics
®
.
VALUE PLASTICS’ BARB:
The Most Secure Connection
The
CLASSIC SERIES
is characterized by a longer barb that
extends the sealing surface of the fitting. Tubing is expanded
from 42% to 69% above its nominal ID.
The
200 SERIES
offers outstanding performance characteristics
when used with flexible tubing. Tubing is expanded by 50%
above its nominal ID, permitting high-pressure capabilities.
The
300 SERIES
offers outstanding performance characteristics
when used with flexible tubing. Tubing is expanded by 35%
above its nominal ID, permitting high-pressure capabilities in
the larger tube sizes.
The
400 Series
provides easy assembly while maintaining
excellent pressure and tensile capabilities. Originally created for
semi-rigid tubing, this series is preferred for applications where
tensile/pressure properties are not highly critical, or when ease
of assembly is desired. The 400 Series expands the tubing 25%
above its nominal ID.
The
500 SERIES
profile is composed of blended radii, giving it
the distinct look. Each barb is designed to accommodate a range
of tube sizes and tube types. Consideration should be given to
flow restriction, pressure capability, and the force required for
assembly of the tube.
The
600 SERIES
barbs are designed for use with silicone, C-Flex
®
and PVC tubing sizes commonly used in biopharm and other
applications. Tubing is expanded from 18% to 34% above its
nominal ID to maintain a low profile and ease of assembly, and
the straight barb stem facilitates use of recommended cable tie
retainers or hose clamps.
The
700 SERIES
barb is designed for use with Value Plastics’ XQ
Series quick connect fittings. This unique single barb is available
in sizes to fit the 1/4” (6.4 mm), 5/16” (7.9 mm) and 3/8” (9.5
mm) ID tubing sizes and materials commonly used in disposable
and reusable medical equipment. Reinforced PVC, unreinforced
PVC and polyurethane tubingmaterials work well with this barb style.
The
900 SERIES
offers outstanding performance characteristics
when used with flexible tubing. Tubing is expanded from 8% to
17% above its nominal ID. This barb provides high flow efficiency
and excellent tensile strength. A hose clamp is recommended
for this series.
SINGLE BARB
MOLD PART LINE:
Placed where it
can’t affect critical
sealing surfaces.
Superior tool design
results in a sharp corner on
the barb, providing “bite”.
Tube is able to relax behind barb.
No mold parting line
on critical sealing surface.
