Fox Valve is the leading global supplier of venturi eductors and venturi transport systems for pneumatic conveying of powders, pellets, and bulk solids. They enable the use of low pressure air ( below 14 psig or 1 bar) to be used to move powders, pellets, and bulk solids with no moving parts. Fox has sold venturi eductors continuously since our first sale, in 1963, of a stainless eductor for use in transporting plastic pellets with air at 4 psig.

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

Fox Venturi Eductors - What are they?

Fox Venturi Eductors convert the output of a blower into suction 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 almost 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?
Fox 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.

For detailed information on eductors - Download Bulletin 301 or request that we mail you a full color, hard copy of Bulletin 301.

Why are eductors used in pneumatic conveying systems?

• Fox 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.
• No Blowback - All rotary airlocks have blowback. If the product conveyed is fine or abrasive, blowback can cause extreme wear problems. Even with free-flowing products, blowback can be a problem, causing bridging and housekeeping problems, or even an explosion hazard. When installed beneath baghouses, screw conveyors, or dust collectors, airlocks can be a major source of fugitive dust emissions, which are eliminated after a retrofit to Fox eductors.
• No mechanical shearing - Eductors minimize the shearing, smearing or degradation of product common with rotary airlocks. And, of course, safety is simply not a concern with Fox eductors.

How are they designed? How are they tested? Are they guaranteed to work?
Fox's 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. Moreover, we have over thirty years of hands-on industrial experience and feedback to draw upon. This enables Fox to performance guarantee every quotation and every eductor that leaves our factory. New or challenging materials can be tested, if necessary, in our in-house conveying test rig. Interested parties are always welcome to visit and witness tests.

Fox Venturi Eductors / Fox Valve
Dover, NJ 07801 USA
Tel: 973.328.1011  Fax: 3651
E-mail: info@foxvalve.com