Mazzei venturi injectors are differential pressure injectors with internal mixing vanes. Superiority of Mazzei injectors is due to the unique, patented design which maximizes injector efficiency, suction capacity and mixing capabilities. The operating costs of Mazzei injectors are lower than less efficient systems, and Mazzei injectors are trouble-free because they have 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.


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. The injectors’ internal mixing vanes 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).

For liquid to liquid mixing only, the Mazzei Injector Selector Tool (button below) is an online calculator
to assist you in sizing an injector for your application


For mixing gas or liquid into liquid, Mazzei has performance tables (button below) to help you choose the correct injector for your project. If you need additional assistance, contact Mazzei Support who will work with you to find the right solution.

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 (PP), Polyvinylidene Fluoride (PVDF), natural PVDF or Ethylene Chlorotrifluoroethylene (ECTFE)

PURCHASE Mazzei products NOW from one of our authorized distributors:


Polypropylene (PP):


  • Highly resistant to most acids and alkalis
  • Versatile and cost effective
  • High tensile strength
  • Light weight and rigid


Polyvinylidene Fluoride (PVDF):

  • 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

Ethylene Chlorotrifluoroethylene (ECTFE):

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

Stainless Steel:

Injector in Fabricated Stainless SteelPotable 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.