Fox Mini-Eductors for Aspirating, Sampling, Mixing,
and Vacuum Generation
What are Fox Mini-Eductors?
enable use of compressed air or a pump to generate suction for a variety of small pumping, mixing, sampling, or vacuum-generation applications. They have been used since 1961 in a very wide range of industrial applications, from agriculture to aerospace. Fox offers a complete line of stock mini-eductors in a variety of materials and capacities. Our off-the-shelf corrosion-resistant units, in 316 stainless, Teflon, or CPVC, enable handling of corrosive liquids and gasses with no moving parts. Flow rates as low as 1/4 SCFM of air or 0.1 GPM can be used to drive Fox mini-eductors.
What's in a name?
Industry uses many different names for the products we supply as Fox Mini-Eductors. A few include : aspirators, vacuum-generators, mixing tees, venturi vacuum pumps, sampling jets.
Typical application of a mini-eductor used for sampling
Fox Mini-eductors have been used in every industry, from mixing fertilizer to purging fuel lines on the Space Shuttle. Some typical uses include:
Sampling: For aspirating liquids or gasses directly to analyzers
Additive Injection: For creating acid, caustic, or other solutions
Vacuum Generation: Vacuum chambers, suction cups
Pump - Priming: Air conditioning start-ups
Mixing: Fertilizer, herbicide, and chemical solutions
For handling <10 lb⁄hr of very fine powders from a feeder.
How Do Fox Mini-Eductors Work?
Mini-Eductors are used in the same way as a pump in a process or system. However, instead of using electricity to drive a rotating impeller or compressor, the mini-eductor uses fluid mechanics to create suction with the energy stored in your motive fluid. This enables pumping or mixing to occur with no moving parts, and therefore with no maintenance.
How do they work?
The 'motive' fluid available to drive the eductor (compressed air, N2, water, etc.) is discharged through a precision machined nozzle. The resulting high velocity jet creates vacuum and can pull in another liquid or gas through the 'suction' port. These two fluid streams are mixed and discharged.
In order to quote the right hardware, we need you to define flow rates, fluid properties, and pressures at all three connections: Motive, Suction, and Discharge. Please note that the eductor accomplishes work by compressing or pressurizing fluid from the suction port up to a higher pressure at the discharge. Discharge pressure, discharge pipe size, and discharge pipe geometry are therefore critical to performance. Discharge pressure needs to be minimized.
What materials are they available in?
Fox stocks off-the-shelf mini-eductors in the following materials:
- 316 stainless