![Axial Piston Pumps - Bent Axis](https://hydraulicsonline.com/wp-content/uploads/2019/07/hydraulic-pumps-category-1500x300.jpg)
Bent axis piston pumps have the best efficiency of all hydraulic pumps.
In general, the largest displacements are approximately one litre per revolution, although a two-litre swept volume hydraulic pump can be built. Variable-displacement pumps are often used, where the oil flow can be adjusted carefully and can operate with a working pressure of up to 350–420 bar in continuous work.