The Peripheral pump is a niche product between the Displacement and the Centrifugal pump, in which the medium is pumped in a Peripheral channel. Today, the Peripheral pump has become crucial in many applications.
Peripheral pumps have the following characteristics:
* they have an ability to transport gas without interrupting the liquid flow or without damaging the bearings due to dry running
* they have their highest power consumption at their highest discharge pressure and their lowest flow rate
* their steep Capacity/Head (Q/H) curves are ideal for pressure-dependent system regulation
* they are non-sensitive to wrong turning direction
* they need very low suction heads (NPSH)
* their narrow columns (peripheral channels) do not allow abrasive components in the liquids
When started, the liquid is sucked through the suction flange and directly into an annular channel, in which rotates the peripheral impeller. The peripheral impeller consists of straight blades, transforming the fluid into a centrifugal motion. The liquid leaves the pump through the discharge flange after it has passed through the annular channel. In the annular channel, the kinetic energy is transferred from the blades onto the liquid, increasing the fluid’s pressure.
The working principle is very similar to that of a Side channel pump. In contrast to the characteristic of ordinary centrifugal pumps, the curves do not flatten with decreasing liquid flows. The pump curves are rather straight lines with their maximum heads at low flows and low heights at peak flows.
This is precisely from the fact that the Peripheral pump is a volume displacer pump.
Check out Superpump for a range of DAB peripheral pumps
