Venturi Injectors

A Venturi Injector is a specialized hydrodynamic device used to efficiently introduce ozone gas into flowing water. In ozone water treatment systems — such as municipal and industrial water purification, wastewater oxidation, cooling tower sanitation, and food & beverage wash processes — maximizing the ozone-to-water transfer efficiency is critical. Venturi injectors create a suction effect by accelerating the liquid through a narrowed throat, lowering pressure and drawing ozone gas into the water stream without mechanical compressors or moving parts. This mechanism enhances mass transfer of ozone, increases dissolved ozone concentration, and promotes effective oxidation reactions, leading to superior contaminant removal and sanitation performance.

Eltech Ozone’s venturi injectors are engineered from ozone-resistant materials and optimized for a broad range of flow rates and ozone doses, making them essential accessories in high-performance ozonation systems.

Core Technology & Data

Principle of Operation

A venturi injector works on the Bernoulli principle: as water flows through a constricted section (the throat) of the injector, fluid velocity increases while static pressure decreases. This induced low-pressure zone enables ozone gas to be drawn into the liquid stream through a gas inlet port without external vacuum equipment.

Key operational facets:

• • Suction Effect: The reduced pressure at the venturi throat pulls ozone gas into the flowing water.
• • Atomization & Entrainment: Narrow throat and diffuser geometry create turbulence, breaking ozone gas into fine bubbles that disperse throughout the water.
• • Enhanced Mass Transfer: Increased bubble surface area and turbulence improve ozone dissolution and reaction kinetics.
• • No Moving Parts: The hydrodynamic design avoids mechanical pumps for gas injection, improving reliability and lowering maintenance requirements.

Venturi performance is influenced by water flow rate, pressure, throat design, and ozone gas inlet conditions. Proper sizing ensures optimal suction strength and ozone transfer for targeted dissolved ozone concentrations.

Materials & Construction

To withstand continuous exposure to oxidative ozone gas and flowing water, Eltech’s venturi injectors are constructed from ozone-resistant materials such as:

• • PVDF (Polyvinylidene Fluoride)
• • Stainless Steel (Grade 316 or higher, where applicable)
• • PTFE/PTFE-lined components

These materials resist oxidative degradation and maintain structural integrity even under prolonged ozonation, ensuring longevity and robust performance.

Integration & Installation

Venturi injectors are typically installed:

• • Inline on the water feed line upstream of the contact tank or static mixer
• • Downstream of flow control valves to regulate venturi suction
• • Ahead of ozone contact chambers to improve dissolved ozone uptake before oxidation reactions proceed

Proper orientation, pressure gauge monitoring, and free-gas venting (or off-gas destruction downstream) are integral to system safety and performance.

Benefits & Performance Highlights

1. 1. Superior Ozone Gas Dissolution
   Venturi injectors significantly improve ozone transfer from gas to water, resulting in higher dissolved ozone levels and more effective oxidation compared to passive diffusion.
2. 2. Increased Oxidative Efficiency
   By maximizing ozone uptake, venturi injectors enable stronger oxidation of organics, microbes, color-causing compounds, and odor precursors — enhancing overall treatment performance.
3. 3. No Moving Parts & Low Maintenance
   With a mechanical-free hydrodynamic design, venturi injectors offer reliable service with minimal wear and reduced maintenance compared to mechanical gas injectors or compressors.
4. 4. Energy-Efficient Ozone Injection
   Venturi suction occurs purely through fluid dynamics driven by existing water flow and pressure — no additional power input is required for ozone gas entrainment.
5. 5. Flexible Flow & Ozone Load Compatibility
   Eltech’s injectors are available in multiple sizes and designs to match a range of flow rates and ozone feed gas volumes, allowing tailored solutions for small or large ozonation systems.
6. 6. Enhanced Contact Time Preparation
   

   By dispersing ozone into fine bubbles at the point of injection, venturi injectors prepare the water stream for superior ozone-to-water contact downstream in static mixers or contact tanks.

7. 7. Robust and Ozone-Resistant Construction
   Built with high-grade ozone-resistant materials, venturi injectors withstand continuous exposure to oxidants and water, supporting long service life and reliability even in demanding environments.
8. 8. Easy Integration with Ozone Systems
   Designed for seamless pairing with ozone generators, static mixers, contactors, and control systems, venturi injectors help create cohesive ozonation solutions with measurable performance gains.

⚠️Important Safety Consideration:
Venturi injectors must be installed in compliance with system pressure and flow specifications and protected against excessive back-pressure or gas lock scenarios. Adequate downstream degassing or ozone destruction is recommended to prevent gas carryover at points of atmospheric discharge.

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Venturi Injectors (Injectors) work by forcing water through a conical body which initiates a pressure differential between the inlet and outlet ports. This creates a vacuum inside the injector body, which initiates ozone suction through the suction port.

Characteristics :

• Very high ozone mass transfer rate (up to 60 to 70%)

• Requires water pump to initiate suction

• Efficiency rarely decreases over time

• No moving parts