Why choose Vogelsang over a Progressing Cavity Pump? Click below to find out:
Inline Maintenance
Run Dry
Compact Size
Pulsation Free
High Efficiency
High Capacity
Low Wear
No Step Down Shafts
In a PC pump, the eccentrically revolving rotor is supported only by touching the stator and would not run properly if this contact would be missing. No clearances are allowed in a PC pump, as the radial guidance would be missing and the bearing would fail.
A slight clearance between the lobe tip and housing segment on a Rotary Lobe Pump allows for longer pump life through reduced wear by friction. Clearance between the rotor and stator in a PC pump results in an abrupt reduction in pump performance as the stator wears.
The tight relationship between rotor and stator is the reason why the PC pump is able to run at low speed and still maintain good volumetric efficiency. This tight relationship of the pumping elements, brings a large design disadvantage, when using this style of pump in abrasive applications.
The abrasive particles are squeezed in the gaps between rotor and stator which causes wear. As the gaps have to remain at zero during the whole life time of the PC Pump, they are always running under wear-by-friction conditions. Rotary lobe pumps however operate in that way only when the particle size exceeds the clearance. Rotary lobe pumps do not have these problems because they are running stable even with a significant amount of lobe wear. Abrasion is actually less in a rotary lobe pump, the longer the pump is operating. This is because the wear is only caused by back-flow velocity not by contact abrasion. Because of the lack of speed limits the internal leakage caused by wear always can be compensated by increasing speed. For PC-pumps this is valid only if there isn't excessive wear to the stator. If the stator is completely worn-out so that contact is missing, the pump has to be maintained immediately.
Some special features you can only get with Vogelsang Products:
Suction Lift
4 wing HiFlo Lobes
6 wing HiFlo Lobes
RotaCut Screens
4 Blade RotaCut
6 Blade RotaCut
