Lobe pumps - Rotary piston pumps

Lobe pumps are displacement pumps. Lobe pumps or rotary piston pumps usually have two pistons with each two or four wings, cased in an oval box.

A vacuum is developed at the rolling direction of the power unit by the regular turns of the rotor pair. Compared to progressing cavity pumps with the same power input, these pumps can convey a larger portion of contaminants as well as fibrous materials.

Rotary piston pumps are self-sucking and valveless. Fluids will be drawn to the inner room by the vacuum created at the sucking side. By further rotation of the pistons, the medium to raise will pass the pumpwall to get to the pressure-area.

One twist will displace - depending on the type of rotors - up to six roomcharges. When the rotary piston pump stops, it locks up almost completely.

The maximum pressure is 2-10 bars; the raised amount is between 0,5 and 4m³/min with a driving power of 7.5 to 55 kw and approx. 200 rpm.

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