Mazzei ® Injectors

PP (polypropylene) or PVDF (kynar) body

Highly efficient in the injection of liquids and gas by pressure difference

The Mazzei ® Injectors offer a safe, precise and economic method to inject practically any kind of liquid or gas into a pressurised current

Operation

  • When a fluid under pressure enters the injector it is channelled towards the injection chamber, and sharply increases speed

    • This accerelation causes a drop in pressure that allows another liquid or gas to be sucked through a special orifice and be mixed with the drive flow

  • When the drive flow advances towards the injector outlet, its speed reduces, creating an increase in pressure (at a lower level that at the injector inlet)

    • The Mazzei ® Injectors require a negligible pressure difference between inlet and outlet to create a feed throgh the suction orifice

    Advantages

    - Low investment and installation cost
    - No external power source is required in most installations
    - Low maintenance costs
    - Suitable for continuous mixing, without requiring additional equipment

    Why Kynar(tm)

  • Because Kynar (PVDF) is more than twice as good as most other plactic
  • Strength, pressure (15 bar), chemical & temperature resistance range are greater
  • Extremely resistant to most AG chemicals
    • - Sulfuric acid 90%, good to 100 °C (PP., PE., Acetal are not recommended)
    - Nitric Acid 65%, good to 60 °C (PP.,PE, not recomended) (PP.,PE. resistant up to 6% at 20 °C to 40 °C)
    - Chlorine (PP. not resistant)
    - Xylene, good to 40 °C (PE., PE., PVC. not resistant)


    Data required for selecting injectors

  • To select the most suitable injector model the following data is required
    1. Total water flow rate of the system (l/min)
    2. Desired fertiliser/chemical product injection flow rate (l/min)
    3. Pressure differental "d" available in the system, calculated as follows:
    1. maximum working pressure of system, at injector inlet (bar)
    2. minimum working pressure of system, at injector outlet (bar)
    3. difference between pressures "a" and "b"

    Percentage pressure differential "d" = (c/a)x100

    If "d" is equal or more than 20% then the by pass installation method can be used

    If "d" is less than the injectors have to be installed in series with an auxiliary pump


    Example: 1=250 l/min, 2=341 l/h, a=5.5 bar, c=1,5 bar. Therefore "d" = 27% This means that we can use a by pass installation, there is no need for a booster pump.