Precisely gear pumps are characterized by a very low NPSHr and are therefore ideally suited for pumping fluids from vacuum. Where for centrifugal pumps the NPSHr is mostly a few meters water column (mlc), gear pumps have a NPSHr of a few centimeters mlc. This is achieved by low speed, high inlet and high suction power of this type of pump.
It is even possible to pump a highly viscous polymer from a vacuum tank with a positive feed height of only a few decimeters with a gear pump!!
Our gear pumps are also used under thin film evaporators (in which vacuum conditions exist) to pump the so-called bottom product from a collector. For example, when processing oligomers.
Suurmond offers solutions for this application for production, R&D and laboratory.
MAAG gear pumps (*) – flow from 0.5 to 2’400 l./min.
Whether or not with magnetic coupling and possibly equipped with a (heated) double hot containment shroud in case of solidifying liquids.
HNPM micro gear pumps – flows 1.5 µl/min to 1.1 l/min.
For example for under a destillation column in a laboratory.
(*) both MAAG industrial pumps and polymer pump type VACOREX®