An eductor, also known as a jet pump, venturi pump, or venturi ejector, is a device that uses a pressurized fluid to move, compress, or pump another fluid or to transport bulk solids.
This principle can be applied in countless ways throughout industry to pump, mix, or transport fluids reliably with no moving parts. Please read below for an explanation on the function of venturi eductors and ejectors.
How Does an Eductor Work?
An eductor operates on the Venturi Effect, outlined by Italian physicist Giovanni Battista Venturi in 1797. This principle is just one practical application of Bernoulli’s Equation.
- The motive fluid enters the eductor at high pressure and low velocity
- The motive fluid travels through a converging nozzle where its velocity increases and its pressure decreases, creating a low-pressure zone inside the suction chamber of the eductor
- The low pressure inside the eductor’s suction chamber pulls fluid (or solids) through the suction port
- The two combined fluids travel through another converging section which mixes the fluids and increases the velocity of the combined fluids
- The divergent section of the venturi converts some of this velocity back to pressure energy
Where are Eductors Used?
Just about everywhere! There is a good chance that your facility has an eductor or jet pump operating right now and you might not even realize it.
Fox Valve has been designing and manufacturing venturi eductors and ejectors for more than 60 years! Our products can generally be divided into five major categories:
- Solids Conveying Eductors – For pneumatic conveying of powders and bulk solids. These products are used to convey everything from apple bits to zircon sand in industries as diverse as food, cement, chemicals, power plants, and mines. These are available as:
- Off the shelf, standard products
- Custom engineered systems
- Liquid Eductors – For broad industrial applications: pumping, mixing, diluting, evacuation, venting, vacuum generation
- Air, Gas, and Steam Ejectors – single- and multi-stage ejectors for venting, exhausting, or creating deep vacuum in the food, power, chemical, paper, and other industries
- Liquid/Solid Slurry Eductors – mix or dissolve powders, pellets and bulk solids into liquids in a broad range of industries – especially food, chemical, and water treatment applications
- Venturi Flow Control Products – Cavitating Venturies, Sonic Chokes, and ΔP Venturi Flowmeters
Company History
Fox Valve was founded by Zola Fox in 1961 to provide highly engineered, custom-designed and manufactured venturi flow controls for liquid rocket engines, spacecraft, research, and demanding industrial applications. More than sixty years later, Fox is still building highly engineered venturi products right here in New Jersey, 20 miles from our original location.
Learn more about our company history
