When designing a vacuum system, the “one-size-fits-all” approach rarely works. EXAIR offers two primary types of single-stage vacuum generators: the In-Line E-Vac and the Adjustable E-Vac. While both use a venturi design to create instantaneous vacuum without moving parts, choosing between them depends on how much control and “forgiveness” your application requires.

The primary difference lies in versatility and internal geometry. In-Line E-Vacs are compact, cylindrical units designed for specific, unchanging tasks.

• Variants: They come in “High Vacuum” models for non-porous materials (like glass or steel) and “Low Vacuum” models for porous materials (like cardboard).
• Limitation: Once you choose a model, its performance is fixed.

Adjustable E-Vacs allow you to “dial in” the exact vacuum level and flow rate needed.

• Versatility: By loosening a locknut and turning the exhaust, you can shift the unit’s performance to handle different weights or surface porosities.
• Durability: They feature a much larger throat diameter, which allows them to pass small solids, dust, and even liquids without clogging.

The Choice: Why Go Adjustable?

The Adjustable E-Vac is the superior choice when your production line handles either variety, or potentially contains contamination. For facilities that use a robotic arm to pick and place various items from a conveyor depending on the job, you would potentially need more than one style of In-Line E-Vac. For example, if one job requires lifting heavy, non-porous plastic containers, you would need a high-vacuum, low-flow unit; whereas if the next job is handling lightweight, porous cardboard boxes, this would require a low-vaccum, high-flow unit.

By choosing the Adjustable E-Vac, you can tune for porosity: Increase the vacuum flow with a quick adjustment to overcome the “leakage” inherent in cardboard. In addition to this, if the surface is less than pristine, the larger throat diameter will have no trouble passing the dirt and debris.

If you’re ready to integrate these tools, several kits and individual units are available:

• EXAIR Adjustable E-Vac Vacuum Generator 840008: A compact 8 SCFM model, ideal for smaller pick-and-place tasks.
• EXAIR Adjustable E-Vac Vacuum Generator 840015: A mid-range 15 SCFM unit for higher flow requirements.
• EXAIR E-Vac Adjustable Vacuum Generator Deluxe Kit 842030: A complete solution including the pump, an assortment of vacuum cups, tubing, a filter separator, and a pressure regulator.
• EXAIR E-Vac Deluxe Kit 842060M: A high-capacity 62.7 SCFM kit featuring a straight-through muffler, perfect for environments with heavy particulate.

If you would like to find out more, give us a call!

Al Wooffitt
Application Engineer

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