Working principle gear pumps, series Verdergear

Series VG 1000 micro external gear pumps

A gear pump consists at the inside of two gears that fits into each other. Each gear has teeth.
The liquid is being sucked into the empty space between the two teeth.
The liquid, trapped between the tooth spaces is being transported to the output side.
After the liquid arrives at the output side, the teeth of the two gears, fill each others empty spaces up, and the liquid is pumped into the outlet.

Series Victor: the working principle of the internal gear pump

The internal gear pump is recognizable on its outer ring. The opening between the teeth is getting wider as the gear rotates, and because this space is getting wider, the liquid is sucked into it. When the gear reaches the output side of the Victor pump, the space is getting smaller, pushing the liquid into the outlet.

The internal gear pump is particularly suitable for liquids that have a wide range of viscosity. The internal gear pumps have relatively low speeds. The internal gear pump has some advantages over the external gear pump. Because the two gears rotate in the same direction, the friction is much lower than with the external gear pump. The localized fluid pressures are substantially lower. The shearing forces on the fluid are therefore much lower. The noise an internal gear pump produces, is also notably lower.

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