1. Reliable, High Pressure and Long Life Design
2. Low Noise
3. High Efficiency and High Self-Priming Capability
4. Extensive Range of Control Options

Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). It generates flow with enough power to overcome pressure induced by the load at the pump outlet. When a hydraulic pump operates, creates a vacuum at the pump inlet, which forces liquid from the reservoir into the inlet line to the pump and by mechanical action delivers this liquid to the pump outlet and forces it into the hydraulic system.

Hydraulic pump types: Gear pumps; Rotary vane pumps; Screw pumps; Bent axis pumps; In-line axial piston pumps, swash plate principle; Radial piston pumps; Peristaltic pumps
Most pumps are working in open systems. But like Rexroth A4VG series are closed system, a more complicated system.