What in the world is the purpose of this thread? At first I thought it was spam but there is no link to a commercial site.
Hydrostatic pumps are positive displacement pumps while hydrodynamic pumps can be fixed displacement pumps, in which the displacement (flow through the pump per rotation of the pump) cannot be adjusted.screw pumps,gear pump,bent axis pumps are the part of this.screw pumps are used for high flows and relatively low pressure (max 100 bar). They were used on board ships where the constant pressure hydraulic system was going through the whole ship, especially for the control of ball valves.axial piston pumps and motors using the bent axis principle, fixed or adjustable displacement, exists in two different basic designs.These have the best efficiency of all pumps. Although in general the largest displacements are approximately one litre per revolution, if necessary a two-liter swept volume pump can be built.hydraulic pump has a equation formula indicate how it works.