Mazzei® Venturi Injectors

Mazzei Venturi injectors are differential pressure injectors with internal mixing vanes. Superiority of Mazzei injectors is due to the unique, patented design which permits them to start suction when the outlet pressure is only 20% lower than the inlet pressure (in most models). Mazzei injectors create thousands of micro bubbles which greatly increases the surface area of gas (oxygen, ozone, etc.) in contact with the liquid — several micro bubbles have a greater surface area than one large bubble of the same volume.  Because of the high efficiency of Mazzei injectors, operating costs are lower than less efficient systems, and they are trouble-free because they include no moving parts.

How a Mazzei® Venturi Injector Works

When pressurized water enters the injector inlet, it is constricted toward the injection chamber and changes into a high-velocity jet stream. The increase in velocity through the injection chamber results in a decrease in absolute pressure, creating a vacuum, thereby enabling an additive material to be drawn through the suction port and entrained into the water stream. As the jet stream is diffused toward the injector outlet, its velocity is reduced and it is reconverted into lower pressure energy.  Click here to view an injector at work.


Mazzei Venturi injectors operate over a wide range of pressures and require only a minimal pressure differential between the inlet and outlet sides to initiate a vacuum at the suction port. Click here to view Injector performance tables in US and metric. The performance tables are divided in two sections: liquid suction and gas suction.


Why Mazzei?

  • Proven performance with years of expected service
  • No electrical connections needed
  • Can run dry with no problems
  • Considerable cost savings versus other injection methods
  • Safe to use as the chemicals are injected under vacuum, not pressure
  • Injectors are available in stainless steel, Polypropylene, natural PVDF or ECTFE


Read more about Selecting an Injector.


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PVDF advantages

  • PVDF is an advanced thermoplastic that is superior to other types including PVC, Polypropylene, & Polyethylene
  • Higher pressure and temperature handling capabilities
  • Resistant to ozone
  • Resistant to Chlorine, Sulfuric and Nitric Acids
  • Better abrasion and wear resistance
  • Sunlight (UV) resistant

ECTFE advantages

  • High purity
  • Flame resistant
  • Impact resistant
  • Excellent weatherability
  • Low permeability

Stainless Steel

Potable water and the food and beverage industries use stainless steel injectors. They ensure absolute performance, longer life and compliance with FDA and international standards for food processing.