How does a venturi work?
Venturis work on a principle of differential pressure.
In short, water flows into the venturi at a higher pressure than that at which it exits. This pressure difference creates a vacuum at the suction port on the side of the device. This sucks air, ozone or liquid into the main water stream. So, the greater the difference in pressure, the greater the vacuum and, with that, the greater the efficiency of mixing.
If sized and installed correctly, a venturi can achieve a gas/water ratio of 1:1. (i.e. inject 1 litre of air/ozone into every litre of water that passes through it). For liquid dosing this ratio is maximum 1:10 (i.e. inject a maximum of 1 litre of chemical into every 10 litres of water).
Venturis come in a number of different sizes. Size is determined not by the size of the pipeline into which it is installed, but rather by the pressure and flow rate of the water.
Which venturi do I need?
Wassertec are agents for Mazzei Injectors, which are made in the USA. Mazzei venturi injectors are engineered from highly chemically resistant Kynar (PVDF) and are available in sizes ranging from ½ inch to 12 inch pipe diameter. We keep stock of models in the ½ inch to 3 inch range. Other sizes are available on request.
What is Fertigation?
“Fertigation is the injection of fertilizers, soil amendments, and other water-soluble products into an irrigation system.
Fertigation is related to chemigation, the injection of chemicals into an irrigation system. The two terms are sometimes used interchangeably however chemigation is generally a more controlled and regulated process due to the nature of the chemicals used. Chemigation often involves pesticides, herbicides, and fungicides, some of which pose health threat to humans, animals, and the environment.
The benefits of fertigation methods over conventional or drop-fertilizing methods include:
- Increased nutrient absorption by plants.
- Reduction of fertilizer, chemicals, and water needed.
- Reduced leaching of chemicals into the water supply.
- Reduced water consumption due to the plant’s increased root mass’s ability to trap and hold water.
- Application of nutrients can be controlled at the precise time and rate necessary.
- Minimized risk of the roots contracting soil borne diseases through the contaminated soil.
- Reduction of soil erosion issues as the nutrients are pumped through the water drip system. Leaching is decreased often through methods used to employ fertigation.”
(Source – Wikipedia)