Understanding How a Dosatron Injector Works

Since 1974, Dosatron has pioneered the development of non-electric proportional dosing pumps. The Dosatron injector operates using a passive volumetric dosing system powered entirely by water flow and pressure, eliminating the need for electricity or measuring devices. The technology centers on a water-driven hydraulic motor piston pump, which consists of two primary components: a water-powered hydraulic piston and a dosing piston.

The Hydraulic Piston Functionality

The hydraulic piston is driven by water pressure, with a series of valves facilitating its reciprocating motion along the pump body’s axis. Each piston cycle corresponds to a specific volume of water that passes through the pump, with the motor’s speed adjusting proportionally to the water flow.

The Role of the Dosing Piston

The dosing piston operates in tandem with the hydraulic piston, mechanically displacing fluid volumes within the system. On the suction side, the volume expands, while on the discharge side, it contracts. This ensures that the volume per stroke remains consistent, regardless of outlet pressure, inlet vacuum, or fluid properties.

How Does a D Series Dosing Pump Work?

Controlling the Injection Rate

The injection rate in a Dosatron pump is managed by a non-return suction valve, which opens during the suction phase and closes during the injection and mixing phase. The dosing seal ensures that the dosing body and piston remain sealed, allowing the metering piston to inject a precise volume of additive during each cycle. This injection volume is proportional to the water passing through the water-powered piston and can be manually adjusted by modifying the dosing body’s capacity. This method guarantees a consistent and continuous dosage that remains proportional to the water flow, independent of variations in flow and pressure.

Mixing the Additive

The additive is injected into the mixing chamber, where it mixes continuously with the driving water, ensuring a homogeneous solution downstream of the pump. The dosing piston’s fixed volume injection remains proportional to the water flow, with adjustments possible via the dosing body’s capacity settings. This system ensures a constant dosage, unaffected by fluctuations in water flow and pressure.

Adjustable Dosing Without a Measuring Device

The maximum dosing ratio is determined by the theoretical ratio of the dosing piston’s surface area to that of the water piston. Users can manually adjust the dosing volume by modifying the dosing piston’s stroke length. Since no measuring device is involved in the process, the dosing percentage relies solely on the hydraulic principles described above. Dosatron technology is available across a wide range of dosing options.

Summary

For nearly 50 years, Dosatron has been at the forefront of dosing pump manufacturing. Their technology offers a non-electric, passive, volumetric dosing solution that includes two reciprocating pistons: a hydraulic piston for creating linear movement and a dosing piston for precise, proportional dosing.

Advantages of the Dosatron Pump:

• Non-electric Operation: The Dosatron pump relies solely on water pressure and flow, eliminating the need for electricity.
• Accurate Dosing: The pump’s precise dosing mechanism prevents overdosing, conserving additives and promoting environmental sustainability.
• Proportional Dosing & Homogeneous Solutions: Designed to deliver a continuous and uniform additive dose proportional to the incoming water volume, regardless of flow and pressure variations.
• Low Operating Costs: With its electric-free and easy-to-maintain design, the Dosatron pump offers low lifecycle costs.

The Dosatron injector performs four key functions through its mechanical design:

1. Measuring: Utilizes a hydraulic volumetric motor for water flow.
2. Dosing: Provides continuous proportional injection of liquid or soluble concentrate.
3. Regulating: Maintains proportionality controlled by water flow.
4. Mixing: Ensures homogenization within the pump body.