The proportional volumetric doser is a device that doses additives or chemicals based on the flow rate of the water or primary fluid. Unlike traditional volumetric dosing devices (which dispense a fixed volume regardless of flow), the proportional dosing device automatically adjusts the amount of product injected, maintaining a constant ratio between the treated liquid and the additive.

Operation

Basic principle

The dosing device uses water pressure and flow to activate a piston or diaphragm.
Each piston stroke corresponds to a predetermined volume of water.
In proportion to this volume, the set amount of additive is aspirated and injected.

• Key feature: The amount of additive dosed varies automatically as the water flow rate varies, ensuring constant mixing.
• Technology: Non-electric proportional pump, which operates solely on water pressure, without the need for external power.
• Calibrated nozzles: In some models, a calibrated nozzle ensures that the concentration does not exceed predetermined values.

Main uses 

• Drinking and industrial water treatment: dosing polyphosphates to prevent limescale buildup. 
• Agriculture: distribution of fertilizers and plant protection products in proportion to irrigation water. 
• Food and pharmaceutical industries: dosing liquid additives in production lines. 
• Cleaning and sanitization: injection of detergents or disinfectants into washing systems. 
• Swimming pools and sports facilities: automatic regulation of chlorine and other chemicals. 

Advantages 

• Dynamic precision: maintains the additive/water ratio constant even with variations in flow rate. 
• Reliability: does not require electricity (in hydraulic models), reducing costs and maintenance. 
• Safety: Prevents overdosing or underdosing, protecting systems and reducing waste.
• Versatility: Suitable for use in a variety of sectors, from domestic (water softening) to industrial.

In conclusion: the proportional volumetric dosing system is the ideal choice when fluid flow varies and consistent and safe mixing is required. It is particularly widespread in water treatment and agriculture, where proportionality is essential to avoid waste and ensure effectiveness.

Contact Dosita Srl to evaluate and recommend the system best suited to your needs.