ViscoTec Pumpen- u. Dosiertechnik GmbH

Dosing pumps with endless piston

Dosing pumps with endless piston principle belong to the group of rotating positive displacement pumps. The principle of operation is comparable to an endless piston, which conveys the product from the suction end to the discharge end, thus building up a pressure difference.

At the heart of every application is a volumetric dosing system. The interaction of a rotor with eccentric motion and a stator adapted to the conditions of the application results in conveying and dosing characteristics which correspond to an endless-motion piston.

Due to the displacement dosing pump geometry, a constant volume is always conveyed proportionally to the angle of rotation per revolution. The conveying direction can be reversed by changing the direction of rotation. The volume is therefore unambiguously defined via the angular degrees.

The dosing pumps technology provides a pressure-stable, linear head capacity curve of the pump. This enables a clear statement to be made regarding the ratio of revolution, time and discharge rate. So the pumps can be used in an application to dose a constant volume based on either time or revolutions. This fact results in a reliable dosing precision at the pump outlet of 1% (depending on the medium), which is often undercut in practice.

Another benefit is the conveying chamber produced, whose volume remains absolutely constant throughout the motion. As a result of this, solids-based media and even lumpy products can be conveyed and delivered.

Viscotec's pump technology provides additional benefits compared to other conveying mechanisms. For example, in over 95% of all applications there is no need for any filling and dosage valves at all, since a short reverse motion at the end of the dosing process causes threads to be broken off or prevents dripping.