Maintenance-Free Feeding for Problematic Products

Nov/Dec 2021

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Maintenance-Free Feeding

for Problem Materials

Fox Venturi Eductors

Does your application involve fine, abrasive, fragile or irregularly-shaped product? More than likely, feeding these materials is negatively affecting your rotary valve performance. One solution for reliable, maintenance free conveying is to use a FOX Venturi Eductor .

How do they work? Fox Eductors, – also referred to as jet pumps – use low pressure air (below 14 psig or 1 bar) to move powders, pellets, and bulk solids into a pneumatic conveying system with no moving parts. Venturi eductor systems can convey product at up to 15 tons per hour over distances up to 500 feet.

Fox eductors convey product at about 3500 to 4500 ft/min. This velocity is high enough to convey most bulk materials with plenty of margin and minimizes line losses and degradation. The nozzle orifice size precisely regulates air flow in the line.

Eliminate a rotary airlock, left, with a FOX Venturi eductor, right, for reliable, maintenance-free conveying.

Advantages to incorporating venturi eductors into your dilute phase pneumatic conveying system include:

No Blowback – Fugitive dust or leakage from rotary valves can cause extreme wear problems with fine or abrasive products. Even blowback from free-flowing products can cause bridging.

Product Integrity – Eductors minimize the shearing, smearing or degradation of products common with rotary airlocks.

Reduced Maintenance – With no moving parts, venturi eductors operate almost entirely maintenance free.

Safety – Reduce explosion hazards by eliminating fugitive dust emissions, often present with rotary valves installed beneath baghouses, screw conveyors, or dust collectors.