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.

In operation the Pneumatic Conveying Venturi Eductors convert the output of a blower into suction that is used to entrain and feed powders, pellets, and bulk solids into a pneumatic conveying system. Because the pneumatic conveying Venturi eductors have no moving parts, they can operate almost entirely maintenance-free.

Pneumatic conveying Venturi Eductors can be fed or placed at the outlet of a hopper and will convey at a specified rate. Venturi size, placement and line size all determine the actual flow rate.

Ceramic lined or hardened units are provided for abrasive applications.

Does this look like your Rotary Valve? We Can Help.

Rotary Valve Seal Leakage

Rotary Valve Damaged Rotor

With no moving parts, a Pneumatic conveying Venturi Eductors is a natural choice for a non-friable product such as plastic pellets. Virgin, Glass Filled, Reinforced, Scrap and Regrind all convey extremely well with a Fox Venturi system. Typical applications include conveying from:

Extruder outlets
Screener outlets
Bins
Silo recirculation

Sanitary - Quick clean Units

Used for the Food, Pharmaceutical and the Plastics markets.

Reclaim System
A collection hopper, gate valve, venturi eductor and rotron blower is used to reclaim product under a sand coating line.

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

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

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

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

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

Hygienic/Diapers
SAP from feeders with uniform flow distribution

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.

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

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)

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

Fox Rotary Valve Venting 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.

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.

What is Blowback?

Rotary Valve Venting Problem

Reclaim systems are implemented to reduce waste by recapturing your product. Generally product is conveyed directly into your source system or it can be conveyed to an independent storage hopper.

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