R900950955 PV7-2X/20-25RA01MAO-10 German Rexroth vane pump

FAQ:

Q1: What is the function of the "A" control? How does it work?

A:​ The "A" control​ is a direct-operated pressure compensator. It uses an internal spring and piston to sense system pressure. When the pressure reaches the preset value (adjusted via the handwheel), the pump automatically de-strokes to near-zero flow, maintaining pressure with minimal energy consumption (holding function). This is ideal for systems with long dwell times.

Q2: What does the "RA01MAO-10" suffix indicate?

A:​ This code defines the mechanical configuration:

• R: Right-hand rotation.

• A: Direct-operated pressure control.

• 01: Pipe threads (G-threads)​ for suction and pressure ports (not SAE flange).

• M: NBR seals, standard for mineral oils.

• A: Standard cylindrical shaft.

• O: No through-drive (solid shaft).

• -10: Zero-stroke pressure range 50–100 bar.

Q3: What is the key difference between PV7 vane pumps and the A4VSO piston pumps?

A:​ The primary differences are pressure capability and cost:

• PV7 (This model): Medium-pressure​ (100-160 bar), lower cost, quieter operation. Ideal for machine tools, clamping, and low-to-medium power applications.

• A4VSO (Previous models): High-pressure​ (350 bar), higher power density, more robust for heavy-duty applications like presses and construction machinery.

  If your system pressure is below 160 bar and noise is a concern, the PV7 is a more economical choice.

Q4: What are the critical installation requirements for this pump?

A:​

• Suction Conditions: The pump requires a flooded suction. The inlet pressure must be between 0.8 bar (abs) and 2.5 bar​ to prevent cavitation and seal damage.

• Case Drain (L Port): Must be connected directly to the tank with minimal backpressure (max 2 bar).

• Port Warning: This model has BSPP (G) threaded ports (01), not SAE flanges. Ensure your piping adapters match this thread type.

Q5: Can this pump be used as a fixed displacement pump?

A:​ No.​ The PV7-2X/...A... is inherently a variable displacement pump. It cannot be "locked" into a fixed displacement mode. Its output flow varies automatically based on system pressure to maintain the set pressure limit. For fixed flow, you would need a gear pump or a fixed vane pump.