Pumps are divided into two groups according to the nature of the force applied:
volume, which is affected by the compressive force, and dynamic, where the inertia force is affected.

Depending on the nature of the connection of the working chamber with the inlet and outlet of the pump, the pumps are periodic (volume) and constant (dynamic). Volume pumps are used to pump fluid from one place to another. These pumps use an energy conversion. The energy of the engine is converted into the energy of the liquid. These are high pressure pumps that are very sensitive to liquid contamination. The work process in volumetric pumps is not stable, therefore
they need to build a massive foundation. Their advantage is that they can work with dry suction.