Bosch Rexroth Radial Piston Pump - PR4-Mini

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Hydraulic pumps of type PR4 are valve-controlled, self-priming radial piston pumps with constant displacement. The pistons are arranged radially to the eccentric shaft. In downward movements of the piston, the working space in the cylinder is enlarged. The resulting underpressure opens the suction valve. This establishes the connection from the suction chamber to the working space. In upward movements of the piston, the suction valve is closed and the pressure valve is opened. The hydraulic fluid now flows to the system via the pressure connection.

The sizes of the 1X series radial piston pump comprise: 0.40, 0.63, 1.00, 1.60, and 2.00. The pump has a maximum operating pressure of 700 bar and a maximum displacement of 2.00 cm3.

Some of the features of the pump include:

  • Fixed displacement
  • Self-priming
  • Long life cycle thanks to hydrodynamically lubricated plain bearings
  • Very compact design
  • Combination possibility with internal gear pumps and vane pumps


Bosch Rexroth PR4-Mini

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