Carolina Material Technologies
Carolina Material Technologies - Bulk Material Handling Solutions
Charlotte, NC 704-846-3737
Fox Venturi Eductors

Fox Venturi Eductors

Fox Valves has been providing Venturi Eductor solutions since 1961. Venturi Eductors are used to feed bulk solids - powders, pellets, flakes, and particulates into pressure, dilute-phase pneumatic conveying systems. Venturi Eductors are commonly used in place of rotary valves where airlocks simply cannot perform adequately. Fox Venturi Products (Fox Valve) has been the leading global supplier of venturi eductors and venturi transport systems for dilute phase pneumatic conveying of powders, pellets, and bulk solids since 1963. Fox Eductors, also referred to as jet pumps, 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. These venturi eductor systems can be used to convey product at up to 15 tons per hour over distances up to 500 feet.

Advantages

Fox Venturi Eductors - What Are They?

Fox Venturi Eductors are used to feed powders, pellets, and bulk solids into a pneumatic conveying system. Because they have no moving parts, they can and often do operate almost entirely maintenance-free. Feedback from customers often reveals five, ten, or even fifteen years of maintenance-free operation. Please ask a CMT representative if your application will be suitable for a Fox Venturi Eductor.

 

How Are They Used In Pneumatic Conveying Systems?

Fox Venturi Eductors are used to introduce bulk solids such as powders, pellets, flakes, and particulates into positive pressure conveying systems. They offer end users and system designers a way to eliminate rotary valves from conveying systems where rotary airlocks/rotary valves simply cannot perform adequately. This often occurs with very fine, abrasive, fragile, or high-temperature solids.

Fox Venturi In Conveying System

Eliminating the rotary airlock, left, with a Venturi eductor, right, permits product feed with no moving parts for maintenance-free conveying.

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Rotary Valve Venting

What is Blowback?

Fox Rotary Valve Venturi Eductors enable a retrofit of badly leaking rotary airlocks that cannot be replaced by eductors.  Product can be conveyed back into your conveying line or back to the top of your product silo.

Venting eductors can:

Eliminate blowback
Reduce required maintenance
Increase - sometimes significantly - throughput from existing rotary valves.

Venturi Eductor Conveying of Limestone 450px

Airlocks isolate and dose solids sitting above a positive pressure convey line.
Air from the conveying system inevitably leaks past clearances in the rotors, as well as the pulses of air released as each empty 'pocket' is rotated upwards. This release of air is called blowback.

Fox Venturi Logo
Features
Fox Eductor Diagram

Industries Served

Building Products
Phenolic resin and sawdust for chipboard; Gypsum for sheetrock; Pumice powder for grout; Roofing granules;

Environmental
Activated Carbon, Sodium Bicarbonate, Hydrated Lime, Pulverized Limestone into ducts and stacks; Sorbent injection in fluidized bed boilers for SOx reduction

Hygienic/Diapers
SAP from feeders with uniform flow distribution

Minerals/Mines
Hot copper and nickel alloys at 1000°F from calciners; Mica, talc, quartz, and perlite ore from dust collectors; Copper pellets at 400 lbs/ft3 bulk density

Cement
CKD at up to 800° F; Portland cement at up to 20,000 lbs/hr; Alternate fuel injection (shredded carpets/plastic/tires//paper; biomass, rice hulls.) Kiln spill at 1600° F

Foundries
Foundry dust from dust collectors; Inoculants to cupolas; Metal grit from grinding stations; Sand and bond

Power/Incineration
Coal, coke, and alternative fuels; Additives for inhibiting slag build-up on boiler tubes; sorbents for SOx reduction in CFB's; Activated carbon, lime, calcium carbonate, Trona injection for flue gas desulphurization (FGD)

Ceramics/Glass
Silica, Glass Frit, Ceramic dust, Mica, Sand/Clay mixes

Food
Minor ingredients to mixing/batching (salt, sugar, spices, vitamins, flavorings, etc.); Milk powders from spray dryers; Coffee beans from bulk bags; Powdered tea from screeners; Rice; Breakfast cereal from coating reels; Snack food extrudate from extruders; Frozen peas from IQF; Whole peanuts

Plastics
Plastic pellets with reduced angel hair and fines from hundreds of extruders and compounding lines since 1963; 50+ fiberglass filled pellets with Clean-in-place, ceramic-lined wear resistant eductors; Conveying plastic regrind and flakes that jam airlocks in 10 minutes.

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