Brand: Rexroth
Model: A4VS0250DR/30R-PPB13N00
Operating principle: axial piston pump
Whether variable: variable hydraulic pump
Number of impellers: single-stage
Nominal displacement: 250mL / h
Rated pressure: 350Mpa
Nominal diameter: 250mm
Material: cast iron
Input power: 3500kw
Output power: 3500kw
Rated speed: 1500r/min
Volume efficiency: 100%
Total efficiency：100%
Inlet diameter: 40mm
Outlet diameter: 40mm
Suction pressure: 350Pa
Weight: 180kg
Name：Axial piston pump
Medium：Oil
Specifications：40-1000

Rexroth oil pumps can be categorized into two types: volumetric and non-volumetric chamber (worm gear type).
Non-volumetric type has centrifugal pumps, axial flow pumps, etc., using high-speed rotating impeller to make the inlet to produce a vacuum inhalation of liquid, and in the outlet of the continuous output pressure liquid. This kind of pump inlet and outlet connected, efficiency with the liquid viscosity increases and decreases, and the output liquid volume with the outlet pressure increases and significantly reduces.
Volumetric pumps realize oil suction and pressure through the change of the volume of an enclosed space. When this enclosed volume changes from small to large, suction is carried out, and when it changes from large to small, pressure is carried out. Typical for Rexroth piston pumps, the plunger from the cylinder hole when the oil suction, pressure into the oil pressure. This pump inlet and outlet are separated, the efficiency depends on the separation of suction and pressure oil chamber of the moving parts between the structure of the process clearance and the viscosity of the oil. The higher the viscosity, the higher the efficiency, the amount of oil delivery remains almost the same (due to a slight effect on efficiency, in addition to the pressure increases to 18MPa, the oil will be compressed by 1%).