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Venturi Injectors

Mazzei Venturi Injector

Contenu

Introduction

Mazzei® Injectors are high-efficiency, venturi-type, differential pressure injectors with internal mixing vanes. When a sufficient pressure difference exists between the inlet and outlet ports of the injector, a vacuum is created inside the injector body, which initiates suction of a liquid or gas through the suction port.

How a 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 pressure, 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 pressure energy (but at a pressure lower than injector inlet pressure). Black injectors

 

Mazzei® Venturi Injectors are extremely efficient. They 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.

Special Features

Les éjecteurs Venturi ne naissent pas égaux. Nos venturis sont optimisés pour l'injection de liquides ou de gaz dans l'eau.

NEW INTERNAL VANES are positioned to maximize injector efficiency, suction capacity, and mixing capabilities
TROUBLE-FREE OPERATION with no moving parts

PROVEN PERFORMANCE with years of expected service
ISO-R (BSPT) threads available in PVDF models-. All ISO-R (BSPT) models are blue in order to avoid any confusion


PVDF advantages:

 

Models

Click on the model reference for complete specifications et the performance table.

 Modèle Connections eau, diamètre Plage indicative de débits d'eau
 287  1/2''   0.074 à 0.32 m3/h
 384  1/2''   0.17 à 0.77 m3/h
 384X  1/2''   0.17 à 0.79 m3/h
 484-A  3/4''   0.23 à 1.43 m3/h
 484-X  3/4''   0.23 à 1.43 m3/h
 584  3/4''   0.64 à 2.38 m3/h
 584-C  3/4''   0.64 à 2.38 m3/h
 684  3/4''   0.91 à 3.43 m3/h
 878  1''   1.1 à 4.4 m3/h
 885-X  1''   1.0 à 4.5 m3/h
 978  1''   1.0 à 5.2 m3/h
1078  1''   1.8 à 6.4 m3/h
 1583-A  1 1/2 ''   3.2 à 12.8 m3/h
 1584-A  1 1/2 ''   4.5 à 22 m3/h
 1585-X  1 1/2 ''   3.3 à 12.8 m3/h
 2081-A  2''   11.0 à 36 m3/h
 2083-X  2''   2.4 à 11.1 m3/h
3090 3'' 18 à 72 m3/h
 4090 4''   16 à 68 m3/h
 4091  4''   40 à 136 m3/h
 6094  6''   95 à 314 m3/h
 8094  8''   151 à 498 m3/h
 12094  12''   317 à 1045 m3/h

Prices

Contact us for pricing.

Selecting an Injector

Mazzei® Injectors are of very high quality and are engineered for exact performance. Selecting the right injector simply requires that you refer to the Performance Tables in the Mazzei Injector Catalog or click on the link in this web site.

The performance tables are divided in two sections: liquid suction and gas suction. Using the guidelines below, you can select the injector that is right for your application.

What you should know to properly select an injector:

  1. What do you want to inject (a liquid or a gas)?
  2. Injection Rate: How much do you want to inject per hour?
  3. Motive Flow Rate: How much water needs to run through the injector?
  4. Inlet Pressure: What is the water pressure available immediately upstream of the injector?
  5. Outlet Pressure: What pressure will the injector see downstream, after installation?

From your data above, use the Mazzei Injector Performance Tables, which can be printed out from this website, to select an injector model able to exceed your desired injection (suction) rate.

The total water flow of the system must be greater than the injector's motive flow capacity (water through the injector).

Steps to finding the correct model Mazzei Injector for your system:

  1. Locate the injector inlet pressure on the performance table which most closely corresponds to your maximum available water pressure.
  2. Locate the injector outlet pressure pressure which most closely corresponds to your system pressure downstream of the injector after installation.
  3. Review the performance table to locate an injector model which has a suction capacity that is greater than your desired suction capacity. Use a metering valve or orifice assembly to adjust the injector's suction rate to obtain the precise suction required.

Remember, for the injector to operate properly, it must experience a higher inlet pressure than outlet pressure (called the differential pressure). Our injectors are very efficient and begin to operate with as little as 20% differential pressure!

There are several installation methods available to ensure the Injector operates properly.

NOTES:

Using a metering valve on the suction line can accurately control the suction rate. Viscosity and weight of material will affect the suction rate.

The water flow (motive flow) listed in the Performance Tables indicates the amount of water that the Injector must see at a given pressure. Also, since the Injector acts as a flow restrictor, this is the total amount of water that will pass through at this pressure.

 

The Outlet Pressure is independent of the Inlet Pressure, which is usually delivered by a pump. For example, if pressurized water is flowing through an Injector and runs down a short pipe and simply falls on the ground, the Outlet Pressure (back-pressure) is nearly zero. Any restrictions downstream in the form of piping, filters, valves, sprinklers, emitters, etc. cause the Outlet Pressure (or back-pressure on the Injector) to change.

Should you have any questions, our experienced technical support staff is ready to help. Contact us with your requirements and allow us to assist you in designing your injection system.

 

Other informations

Videos

Voir les vidéos à la page AirJector. Les vidéos montrent des systèmes de démonstration ainsi que des installations réelles

Technical Bulletins

Following are links to Technical Bulletins that provide in-depth information on subjects relevant to the use of Mazzei® Injectors.

Adobe Acrobat Reader is needed to view Tech Bulletins:

Résumés d'articles pas encore publiés (en anglais):


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