Pumping and Mixing Liquids

Fox Liquid Eductors for Pumping, Mixing and Blending

Fox liquid eductors, also known as jet pumps, venturi mixers, and jet ejectors use motive liquid to entrain, mix, and pump liquids, slurries, or gases using no moving parts. Unlike pumps, they have no seals, packing, or bearings and are ideal for pumping corrosive, explosive, hazardous, or toxic fluids. They offer a no-maintenance option to replace or eliminate pumps when explosion-proof motors would be required.

Liquids that can be used to drive a Fox venturi jet pump:

  • Water, Seawater or DI Water
  • Hydraulic oil
  • Gasoline, jet fuel, biodiesel
  • Refrigerants such as R134a
  • Orange juice, milk, beverages

Key Features:

  • No Moving Parts – Eductors are reliable, with no seals or packing to leak. When appropriate, they can be completely welded together – eliminating all soft seals. Eductors are a common replacement for peristaltic or chemical injection pumps when reliability in the field must be 24/7.
  • Vacuum up to 25” Hg (0,15 bara) – Eductors are capable of pulling deep vacuum, and can be used to lift liquids 20-25 ft. (7m)
  • Rugged and Easy to Operate – Eductors are self-priming and can be installed in any position – horizontal or vertical. They can ingest small particulates. If they need to handle abrasive slurries (such as produced water from oil and gas wells containing sand and grit) Fox liquid eductors can be ceramic or tool-steel lined with replaceable wear parts.
  • Cost-Effective – Initial cost is low compared to other traditional pumping options, especially when fully sanitary/food-grade pumps, or XP motors, or pumps made from exotic materials are required.
  • Optimized OEM liquid eductors with performance, end connections, and materials to facilitate integration into your product. Fox supplies many thousands of highly customized eductors every year to our OEM customers. All are the result of a multi-step process of prototype manufacture, development test units, and final production designs – a process that can be completed in weeks, not months.

What pump pressure is required?

Typical motive liquid pressures are 20 – 120 psig (1.4 to 8 barg) but higher or lower pressures can be useful in certain applications. Discharge pressure, as a general rule, must be less than about half of supply pressure.

Available Eductor Line Sizes, End Connections, Materials Configurations

  • Line Sizes: 1/4 to 16 inch diameter (6mm to 400mm)
  • Materials:
    • Metals: Stainless, Carbon Steel, Monel, Hastelloy, Titanium, Alloy 20, Aluminum, Brass, Bronze, or Any Machinable Metal
    • Plastics: PVC, CPVC, TFE-Lined, PVDF-Lined
  • Off-The-Shelf Liquid Eductors in CS/SS: 1/4″ to 4″
  • Off-The-Shelf PVC: 1/2″ to 3″; CPVC 1/2″ to 2″
  • Custom built eductors: 1/4″ to 16″
  • Custom PTFE/PVDF-Lined: 2″ to 4″
  • MAWP available to 10,000 psig (700 barg)
  • End Connections:
    • Threads: NPT, BSP, SAE 45° Flare, AN 37° Flare
    • Flanges: 150# to 3000# ANSI, DIN Flanges, or any custom-built flange to mate to any equipment
    • Tubing: Stub ends of any specified tubing, inch or mm
    • Food-grade: Tri-clamp or other sanitary/hygienic ferrules
    • Weld: Butt weld prep ends, sockets, etc.
  • Available Surface Treatments: Electropolish, oxygen cleaning, passivation, anodizing, etc.
  • Available Documentation & Testing: NACE-certified materials, hydrotest to 8000 psig


Fox Liquid-driven eductors can be found in almost every industry. Typical applications include:

  • Acid or Caustic Dilution – Diluting HF, H2SO4 acids, Replacing chemical injection pumps
  • Emptying sumps, spills, rainwater, sewage
  • Blending or Mixing Additives into beverages, juices, animal nutrition, chemical and hydrocarbon solutions
  • Fluoridation and Chlorination of drinking water
  • Pumping/treating produced water from wells and storage at oil exploration sites
  • Emptying or scavenging fuel or hydraulic oil accumulated in sumps, troughs, etc.
  • Mixing food-grade CIP rinsing solutions for use in food and dairy piping systems
  • Purging fuel lines, vessels, rail cars and tanks before maintenance
  • Refrigerant (R-143A, R-410A, etc.) pumping, recirculation of in HVAC and chiller systems
  • Injecting performance additives into Diesel, gasoline, RP-1 and other fuels
  • Hydraulic oil recirculation
  • Pumping radioactive fluids – from underground tanks, etc.

Fox Liquid Eductors are made in the USA

This means:

  • Reliable Deliveries on both small and OEM quantities. Stock eductors (1/2 inch to 3 inch) ship in 2 to 5 days
  • Rush/Expedited delivery is usually available (when standard designs cannot be used or exotic materials are needed)

Typical Applications

Sump Eductor

Many eductors are in use as primary or back-up transfer pumps on “catch-all” sumps or receivers where the fluid pumped can vary from day to day. They are also valuable in emergency spill cleanup, as they can be operated in any position and are self-priming.

Acid or Caustic Dilution

Fox Eductors are often used to blend batches of caustic or acid solutions. This image shows an eductor filling a batch tank. Motive water is used to entrain the concentrated fluid under vacuum. The concentrate is then mixed with the water to form the desired solution concentration. Secondary mixing of the new solution and the existing liquid can be obtained with the Fox Tank Mixing Eductors. The eductor eliminates costly and troublesome corrosion resistant chemical feed pumps.

Pump Priming Eductor

Fox eductors are ideal for priming pumps. The eductor suction port is piped to the highest point of the pump casing. The motive water is used to evacuate the pump case and suction line. When the exhauster discharge flow is free of air bubbles, the pump is primed.