Rexroth A4VSO125DR Piston Pump
The Rexroth A4VSO125DR is a designed, reliable, and energy-saving constant pressure variable displacement piston pump. Its "external pilot pressure control" feature endows it with excellent remote control and system integration flexibility, making it an ideal choice for achieving constant pressure and energy-saving requirements in medium and high pressure, high-power hydraulic systems.
Model Analysis: A4VSO125DR
The model naming of Rexroth usually includes information such as series, design, displacement, control mode, etc. We can disassemble A4VSO125DR as follows:
A4VSO: This is the basic series identification of the pump.
A4: Refers to axial piston pumps with a slanted disc design.
VS: Represents a variable displacement pump with adjustable displacement.
O: Usually refers to a through shaft design that allows other pumps (such as gear pumps) to be connected in series at the rear end as auxiliary pumps.
125: Displacement code. This is one of the most critical parameters of this model. The number "125" indicates that the nominal displacement of the pump is 125 cm ³/rev (milliliters per revolution). In theory, for every revolution of the drive shaft, the pump discharges 125 milliliters of hydraulic oil.
DR: Control mode code. This is another key parameter of the model, which determines how the pump automatically changes its displacement according to system requirements.
D: Represents "pressure control" or "constant pressure control". The output pressure of the pump will be maintained at a set value (i.e. constant pressure point). When the system pressure reaches the set value, the inclined plate angle of the pump automatically swings back, and the displacement decreases to only compensate for system leakage (close to zero displacement), thereby achieving energy saving. When the pressure drops, the displacement increases to maintain the pressure.
R: Usually represents "remote control" or "external pilot pressure control". This means that the set value of the constant pressure point (D control) is not directly set by the mechanical handle on the pump body, but is continuously adjusted through an external pilot pressure oil (usually introduced from the X port). The higher the external pressure, the higher the constant pressure point set for the pump.
Summary: A4VSO125DR is a through axis variable axial piston pump with a nominal displacement of 125 milliliters per revolution, using a constant pressure variable mode controlled by external pilot pressure.
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