The Technology Behind PreeFlow®

The Endless-Piston Principle

	Just imagine a single simple piston in a cylinder....
	Or even better, several pistons behind each other....
	Now we'll make the wall thickness of the piston zero....
	Now change the piston shape slightly....
	You end up with the Endless-Piston Principle !!

3-D section through the PreeFlow® eco-PEN450 Dispenser showing Endless Piston (Rotor & Stator)

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How It Works !!

PreeFlow dispensers are effectively rotating positive displacement pumps. Their operating principle can be compared with an Endless Piston that conveys the product from the suction end to the discharge end, building up a differential pressure in the process.

At the core of every application is a volumetric conveying pump. The interaction between an eccentrically moving rotor and a stator adapted to the application conditions, produces material flow and dosing characteristics resembling those of an endlessly moving piston, as explained above.

This geometry ensures that, per rotation, a constant flow volume proportional to rotary angle is always produced. The flow direction can be reversed by simply changing the direction of rotation. The volume dispensed is therefore, clearly determined by degree angle. A further advantage of this technology is that a pressure-stable, linear pump characteristic curve is obtained.

From these facts we can conclude that there is a definable ratio between rotation, time and flow volume. Therefore, these pumps can produce a constant dosing volume via the parameters of time or rotation, when used in an application. This results in a guaranteed dosing accuracy of +1% at the pump outlet (depending on the medium being dispensed). This figure is often even better in practice.

An additional advantage is in the discharge chamber that is created – its volume remains absolutely constant during the course of displacement. This leads to the possibility of conveying and dispensing media containing solids and even abrasive particles.

Compared to other conveying methods, this pumping technology has even more advantages to offer: For example, in over 95% of all applications, it is possible to eliminate filling and dosing valves completely, since the pump goes into reverse flow at the end of dosing, which breaks off the product thread or prevents any dripping and mess. 

Did you know ?

There is always a lot of haggling over purchase prices, but the product life-cycle costs can quite simply be ignored. Who likes to think about costs that could arise at some point later in the future? What matters here and now is the actual purchase price, i.e. getting the best you can at the cheapest price. But that is wrong !!

Compared to the operating costs, e.g. repairs, maintenance, energy costs or costs arising from machine downtimes or rejects, the purchase price only amounts to a maximum of 25% of the total life-cycle costs. Therefore, the main focus should surely be on the costs that ensue as a result of the purchase and not the other way round.

If you make a false economy, you will likely regret it later. Payback time will come when the life-cycle costs rocket and everyone’s nerves are frayed.

Here PreeFlow® can offer you the right solutions with many advantages....

   Lower repair costs due to system design with reserve capacity 

    Less downtime due to highly wear-resistant component parts

   Fewer rejects thanks to high precision and reliability

   Low energy costs as operation is completely electronic

In this way you not only opt for the technically better solution, but also the one offering the lower life-cycle costs.

So what are you waiting for..... Choose PreeFlow® !!

   eco-PEN Micro Dispensers

   eco-CONTROL Dispenser Controllers

   Dispenser Accessories