R900534508 PV7-1X/25-45RE01MC0-08 Variable blade pump from Rexroth, Germany

Frequently Asked Questions (FAQ)

Q1: What is the function of the "C" control? How does it differ from the "A" control?

A:​ The "C" control​ is a pilot-operated (servo) pressure compensator. It uses a small pilot valve to control a large piston, providing faster and more sensitive response compared to the direct-operated "A" control. When system pressure reaches the set value (adjusted via handwheel), the pump quickly de-strokes to near-zero flow, maintaining pressure with minimal energy loss. It is more precise and has less hysteresis than the "A" type.

Q2: What does the "RE01MC0-16" suffix indicate?

A:​ This code defines the mechanical configuration and settings:

• R: Right-hand rotation.

• E: Cylindrical shaft with parallel key (ISO 3019-2).

• 01: Pipe threads (G-threads)​ for suction and pressure ports.

• M: NBR seals, standard for mineral oils.

• C: Pilot-operated pressure controller.

• 0: Standard version.

• -16: Zero-stroke pressure adjustment range up to 160 bar.

Q3: What is the key difference between this model (PV7-1X/25-45) and the previous PV7-1X/25-30?

A:​ The primary difference is the displacement and flow output:

• PV7-1X/25-45 (This model): Larger displacement (45 cm³/rev), higher flow output (~66 L/min), and requires more drive power (~20.5 kW). It is designed for applications needing higher flow at 160 bar.

• PV7-1X/25-30 (Previous model): Smaller displacement (30 cm³/rev), lower flow (~43.5 L/min), and lower power requirement (~13.7 kW).

  Both share the same robust BG25 frame and 160 bar pressure capability.

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

A:​

• Suction Conditions: Requires a flooded suction. Inlet pressure must be between 0.8 bar (abs) and 2.5 bar​ to prevent cavitation.

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

• Shaft Warning: The shaft is not designed to handle radial or axial loads. Ensure perfect alignment with the motor using a flexible coupling.

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

A:​ No.​ The PV7-1X/...C... is inherently a variable displacement pump. Its output flow automatically reduces to zero when system pressure reaches the set value (pressure-holding function). For fixed flow, you would need a gear pump or a fixed vane pump.