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JOSKIN Pro Days – Edition 2023

pumping system: lobe pump


The lobe system uses the mechanical action of two lobe rotors. Their rotation creates a vacuum on the suction side, which attracts the slurry into the pump body. The slurry is then carried through the lobes, along the rotor wall and discharged on the other side. These pumps do not take much place although they have a relatively high capacity. Their suction principle ensures them a maximum stability and eliminates almost all vibrations. Furthermore, they are all equipped as standard with an automatic stop system (optional on TETRALINER) and wear rings. These pumps have many advantages: high filling and emptying speed, possibility of pumping thicker slurry than with vacuum pumps, compatibility with long suction hoses or spreading implements, pumping performance maintained at a depth of more than 3.5 m, standard equipment for mixing and transfer from pit to pit, output pressure higher than 1 bar guaranteeing a good distribution with a high working width, etc.

The Vogelsang lobe pumps offered by JOSKIN are all equipped with HiFlo® lobes that guarantee a perfectly linear flow. This means that they are not subject to vibration, thereby extending the lifespan of the moving parts. This unique design limits cavitation, allows higher rotation speeds, and therefore higher flow rates, for the same pump size. Lobe wear and turbulence at the inlet are greatly reduced. JOSKIN fits the lobe pumps on the side of the tankers so that they are easily accessible for maintenance. This assembly includes a PTO drive and an angle transmission gearbox. As an option, the drive can also be powered by a hydraulic motor, for an easier and more precise adjustment of the flow rate.

In order to protect the volumetric pump as much as possible against foreign bodies or to avoid blockages due to heavy slurry, JOSKIN has developed the "Rotation-Cut" chopper. It is placed before the pump inlet to filter the slurry. This large-volume chopper is equipped with a drain valve: when you arrive at the field, you can open it from the driver's seat to remove any foreign bodies (stones, etc.) it could contain.

Unlike vacuum pumps, the slurry goes through the volumetric pumps and the flow rate mentioned here is the amount of liquid per minute. When used on slurry tankers, there could theoretically be an overflow. In order to avoid such a situation, an automatic filling stop system can be fitted. In this case, a signal from the float gauge gives the filling status and changes the position of the valves from "full" to "mixing in closed circuit". The pump then no longer sucks in slurry and does a mixing job.