5

Our Single Barb Concept

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.

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

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 character-istics when used with flexible tubing. Tubing is expanded by 35% above its nominal ID, permitting high-pressure capabili-ties in the larger tube sizes. 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. 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.
®

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.

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 recom- mended cable tie retainers or hose clamps. 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 The 900 SERIES offers outstanding performance character-istics 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 recom- mended for this series.
® or other manufacturers. None of the information provided constitutes a recommendation or endorsement of any kind by Value Plastics ® .

v.022a