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Venturi Injectors and the Venturi Effect in Chemical Dosing

Looking to add some excitement to your chemical dosing process? Look no further than venturi injectors and the venturi effect, which we at Clean Logix have been using for over a decade in our BLX boot scrubbers and more recently in our SLX sanitation equipment.

Simulation of Venturi Effect - particles speed up in the tight space in the middle creating a pressure drop.

Venturi injectors are essential devices in the field of chemical dosing, which is the process of adding precise amounts of chemicals into a fluid stream (generally water) to achieve specific treatment goals. Venturi injectors utilize the Venturi effect, a phenomenon observed in fluid dynamics, to create a simple, effective, and reliable system for injecting chemicals into various applications. This article delves into the principles behind the Venturi effect and how it is applied in Venturi injectors to enable efficient chemical dosing.

The Venturi Effect: A Fluid Dynamics Phenomenon

The Venturi Effect is both a physical phenomenon and a fundamental principle in fluid dynamics that was discovered by the Italian physicist Giovanni Venturi in the 18th century. It states that as a fluid’s velocity increases, its pressure decreases. This occurs when a fluid passes through a constriction or narrowed section within a pipe or channel. The constriction forces the fluid to accelerate, and as a result, the fluid’s static pressure decreases while its kinetic energy increases.

Venturi Injectors: Harnessing the Venturi Effect

A Venturi injector is a simple device that leverages the Venturi effect to mix and dose chemicals into a fluid stream. It consists of three main components:

  1. Inlet (jet): The fluid enters the injector through this section, and its pressure is still relatively high.

  2. Constriction (throat): The fluid flows through a narrowed section, where its velocity increases and its pressure decreases.

  3. Outlet: The fluid exits the injector, and its pressure starts to recover.

As the fluid passes through the constriction, the decrease in pressure creates a suction effect. This suction draws the chemical to be dosed into the fluid stream through a separate inlet, called the suction port, typically connected to a chemical feed line. The chemical is then mixed with the fluid due to turbulence and pressure recovery downstream of the constriction. This is the case for both BLX boot scrubbers and SLX sanitation equipment for decentralized cleaning applications.

Advantages of Venturi Injectors in Chemical Dosing

Venturi injectors offer several benefits when it comes to chemical dosing applications:

  • No moving parts: Venturi injectors have a simple design without any moving parts, reducing the chances of mechanical failure and ensuring low maintenance requirements.

  • Self-priming: The suction created by the Venturi effect allows the injector to prime itself automatically, eliminating the need for an external priming mechanism.

  • Passive operation: Venturi injectors operate passively, relying solely on the fluid flow’s energy to induce chemical dosing. This reduces the need for external power sources or complicated control systems.

  • Proportional dosing: The chemical dosing rate is proportional to the fluid flow rate, ensuring a consistent chemical concentration in the treated fluid.

  • High mixing efficiency: The turbulence created by the Venturi effect promotes the mixing of the chemical with the fluid, increasing the efficiency of the chemical treatment process.

Applications of Venturi Injectors in Chemical Dosing

Venturi injectors are widely used in various industries for chemical dosing, including:

  • Water and wastewater treatment: Injecting coagulants, disinfectants, and pH adjusters into water streams to improve water quality.

  • Agriculture: Dosing fertilizers, pesticides, and growth regulators in irrigation systems.

  • Food and beverage industry: Adding preservatives, sanitizers, or flavoring agents into product streams.

  • Cooling towers and boilers: Introducing corrosion inhibitors, scale preventatives, and biocides to maintain system efficiency and extend equipment life.

Clean Logix Products that use Venturi Injectors

The Venturi Effect is at the heart of several products in Clean Logix's equipment catalog, primarily for in-line dilution of cleaning and sanitation solutions for various applications:

  • BLX Boot Scrubbers: Venturi Injectors are included with all automated boot scrubbers to dilute concentrated detergents or sanitizer directly into the spray system to be applied to rotating brushes for cleaning boots and shoes. Metering tips are used to alter dilution ratios to get the best concentration for each application.

  • SLX Venturi Applicators: Water-supplied foamers and sanitizer applicators include a venturi injector insert that is able to be easily removed for servicing or maintenance. Insert sizes vary to accommodate a range of flow rates and dilution ratios using metering tips to dial in the precise amount of solution for each cleaning or sanitation procedure. This applies to both hose drop stations for equipment or facility applications and entryway stations for spraying the floors of doorways or other critical zones.

  • SLX Mixing Station Proportioners: For local, manual dosing of larger dispense applications, such as day tanks or bulk containers. Similar to SLX applicators, the Mixing Stations feature the same removable venturi insert for servicing and maintenance. The major difference is instead of spraying something with the mixed product like the applicators, the Mixing Station is just for filling containers. There are two options for dilution type: Standard, for normal dosing, which includes metering tips to control dilution ranges. Or XC, Extreme Concentrate, for higher concentrations that feature metering plugs with larger orifices to allow more chemical dosing (up to 0.8:1 ratios).

Want more information on the venturi effect or chemical dosing? Contact us and we'll help you out!


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