R902530169 A4VSO250DRG/30R-PPB13N00 German made Rexroth variable displacement piston pump

FAQ:

Q1: What is the function of the "DRG" control? How is it different from "DR"?

A:​ The DRG​ is an enhanced Pressure Compensator​ that includes a remote control function. Unlike the standard DR control which is adjusted mechanically on the pump, the DRG allows you to adjust the pressure setting remotely via an external pilot pressure signal (typically connected to the X port). This is ideal for systems requiring centralized or automated pressure control.

Q2: What does the "PPB13N00" suffix indicate?

A:​ This code defines the mechanical configuration:

• P: NBR (Nitrile)​ seals, standard for mineral oils.

• P: Standard parallel key shaft​ (DIN 6885).

• B13: Port size code 13​ (SAE flange ports with metric threads).

• N00: No through-drive​ (solid shaft end, cannot mount additional pumps on the shaft).

Q3: What is the key difference between this A4VSO250 and the previously mentioned A4VSO180?

A:​ The primary difference is the displacement size and power level:

• A4VSO250: 250 cm³/rev, providing higher flow output (~375 L/min vs ~324 L/min at same speed) and is physically larger/heavier (184 kg vs 102 kg).

• A4VSO180: 180 cm³/rev, smaller size for medium-heavy applications.

  Both operate at the same high pressure (350 bar) but the 250 size is typically used in very heavy industrial machinery like large forging presses and heavy metallurgical equipment.

Q4: What are the X and L ports used for?

A:​

• X Port (Control): Remote Pressure Control. It is used to supply an external pilot pressure signal to remotely adjust the DRG pressure setting.

• L Port (Case Drain): Must be connected directly to the tank. It relieves internal leakage pressure to protect the shaft seal. Maximum allowable backpressure is typically 0.5-2 bar.

Q5: Can this pump be used in a closed-loop system?

A:​ No.​ The A4VSO DRG is designed exclusively for open-circuit applications​ (pump → valve → actuator → tank). For closed-loop hydrostatic transmissions, you would need an A4VG or A2FM series unit.