Venturi Eductors for Conveying Solids with No Moving Parts

  • No Maintenance
  • No Blow-Back
  • Minimal Product Degradation

Venturi Eductors - What are they?

Venturi Eductors convert the output of a blower into a ‘vacuum’ that can be used to entrain and feed powders, pellets, and bulk solids into a pneumatic conveying system. Because they have no moving parts, they can operate entirely maintenance-free.

The eductor acts to compress the air/solids mixture to a pressure adequate to overcome losses in the downstream convey line. The eductor has three connections:

  • Motive Air
  • Suction or Product Inlet
  • Discharge

How are they used in pneumatic conveying systems?

Venturi Eductors are used to feed bulk solids, such as powders, pellets, flakes, and particulates, into positive, dilute-phase conveying systems. They are commonly used in place of rotary valves where airlocks simply cannot perform adequately. 

Eductors are attractive to install beneath other solids processing equipment because, by creating suction at the product inlet, they enable dust-free material conveying systems. They are commonly installed beneath:

  • Baghouses/Dust Collectors
  • Volumetric and Loss-in-Weight Screw Feeders
  • Screener/Classifier Outlets
  • Mixers, Grinders, and Mills
  • Bins, Silos, and Bulk-bag unloaders

Who uses them?

Venturi Eductors are used in industries as diverse as plastics, power, chemicals, food & dairy, foundries, mining, bakeries, smelting— anywhere that powders or pelletized products are transported.

Why are eductors used in pneumatic conveying systems?

Venturi Eductors have no moving parts - allowing for maintenance-free feeding of bulk solids. In applications involving fine, abrasive, or irregularly-shaped products, this is an enormous advantage. Replacement of existing rotary airlocks with venturi eductors makes for simpler, more reliable conveying systems. Designing with eductors from the beginning ensures the most reliable product feeding available.

How are they designed? How are they tested? Are they guaranteed to work?

Eductor designs have been exhaustively tested with different materials, line lengths, motive air flows and pressures - yielding the most complete set of performance data ever accumulated. This data has been transformed into computer algorithms which allow our engineers to rapidly and precisely predict eductor performance with almost any product in your system.