![]() Additionally, it is usually more difficult to push tubing onto a fitting designed with progressively larger barbs.īoth types of barbs work best with flexible tubing with excellent memory characteristics, such as polyurethane. This distribution of force over a large area reduces the holding force and also increases the chance of leakage. However, the multi-barbs, of progressively larger diameter, may disperse the holding power of the tubing over a greater area. On first appearance, this design looks like it could hold tubing more securely than a single “line contact” barb. This is the “old standard” design and is still found in many industrial applications but has many disadvantages. “Christmas-tree” (multiple barbs of increasing diameter) barb do not seal as well **May require tubing modification Barbed Fittings *Depending on the duromter (Typically 95 shore A or higher) Read on to learn more about the individual fitting styles. This table summarizes the fitting selection process. There are three common types of fittings used in miniature fluid power applications: Chemical compatibility with gas or liquid, minimum and maximum pressures, expected temperature extremes, need for rigid or flexible lines, ease of assembly and maintenance, and external environmental conditions will determine which tubing or hose to specify in the application. There are many design considerations when selecting tubing. Tubing types commonly found in miniature fluid power applications range from rigid metal (such as copper and stainless steel) to relatively flexible elastomeric or polymer tubing and hose (such as polyurethane, polyethylene, nylon, Teflon®¹, PEEK®², PVC, Silicone, Viton®³, and others). With limited time available to conduct research, even experienced designers and engineers can use help selecting the best type of fittings for their application.īefore a miniature pneumatic fitting is chosen for an application the hose or tubing must be selected. The selection of relatively simple components, such as fluid power fittings, is often put off until the end of the design cycle. ![]() As you would expect, the most complex components are selected first. ![]() This white paper will help you to determine which miniature (barbed, push-to-connect, or compression) fitting type is suitable for your specific application.Īt the beginning of a new project, engineers and designers are faced with many important decisions regarding the selection of components.
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