CP PUMPEN AG, Im Brühl, 4800 Zofingen, Switzerland
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Peripheral Pump

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.

CP’s Peripheral pumps

CP’s magnetic coupled Peripheral pumps are particularly recommended for small capacities (Q from 0.1 to 8 m³/h) and high delivery pressures (H up to 170 m). The pumped liquid and the operating conditions determine the selection of the materials. The casing material ranges from high-alloyed stainless steels, nickel and nickel basis alloys to various high-quality plastics. The pumps are made without a shaft seal: the diving torque is merely transmitted with permanent magnetic synchronous couplings (magnetic drives).

These CP pumps are available: MKPP, MSKPP

    
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