Your Dispenser for the Dispensing of 2-component Fluids

preeflow® eco-DUO

Two component mixing and dispensing system from preeflow: The first purely volumetric dispensing system for precise mixing and applicating minimum quantities of 2-component fluids and pastes. With targeted controlling of the single components the mixing ratio can be adjusted up to the second place after the decimal point. Independent from viscosity fluctuations, a clean and process reliable dosing can be achieved.

Controlled thread breakage, thanks to the suck-back effect, and other functions, distinguish the preeflow mixing dispenser of the eco-DUO series. With their simple and safe operation, the 2 part dispensing systems can be used flexibly. Experience precise mechanics combined with the latest digital control unit.

2-component dispenser: The preeflow® eco-DUO is impressive

Valveless sealed technology without dripping

Dosing pressures up to 40 bar are possible

The pressure tank is not required with self-levelling fluids

Repeat accuracy > 99 %

Self-sealing: No pressure valves are necessary

Dosing accuracy ± 1 %

Guaranteed safety shut down

Products in detail

It must be good if it’s being copied! Fortunately, our products are so successful that there are always companies who want to sell them – even without our permission. That’s why they try to copy our products and partly even sell them under our name. When dealing with counterfeit products there can be big differences in quality. preeflow is not liable for copied products. We will be happy to tell you where you can obtain original products and accessories, for which we promise 100% quality and reliability!

Smallest dispensing quantity: 0.005 ml
Adjustable dosing flow: 0.1 – 6.6 ml/min
Weight: ca. 1,100 g


The eco-DUO330 precision-volume dosing unit made by preeflow doses the smallest of quantities which until now have not been achieved.

Theory of function

The preeflow eco-DUO330 is a rotating, perfectly pressure-tight, positive displacement system with self-sealing rotor-stator arrangement. Conveyance action by material  displacement in the stator through controlled rotor movement. Safe conveyance without any modification to the material. With its suck back option, the mixing dispenser ensures a clean and controlled material or medium cut-off while preventing post-dripping effects.

Datasheet eco-DUO330 Spare parts eco-DUO330

Control Units


The control unit eco-CONTROL EC200-DUO from preeflow offers a wide range of applications for high-precision two component dispensing systems.

 control unit eco-CONTROL EC200-DUO from preeflow

Theory of function

The control unit eco-CONTROL EC200-DUO has been developed and tested for accurate work with the preeflow high-precision, volumetric, 2 component dispensers. The control unit has a variety of configuration options to dosing quantity, mixing ratio and dispensing time.

All production-related values can be stored and changed at any time. The operation takes place over an intuitive user guidance using a graphical user interface. An integrated pressure control ensures the optimum process safety of the system. There is also the possibility of data exchange with a USB interface.

Data sheet eco-CONTROL EC200-DUO

Is the eco-DUO the right solution for you?

Together we can find out:

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preeflow® – microdispensing in perfection

More than 20 years of experience in fluid dispensing. This comprehensive know-how in dosing technology distinguishes ViscoTec. In 2008, this wealth of experience was expanded with the introduction of the preeflow brand. With success: For 10 years, preeflow has stood for precise and purely volumetric dispensing of liquids in small and very small quantities. All over the world, a wide variety of industries rely on preeflow products. Always in the sense of the claim: Smaller, more precise, more economical.