PVB15 RSY 31 CM11 PVB29-RS-20-CC-11 Eaton Vickers Variable Piston Pump

Product Overview

The PVB15 RSY 31 CM11 and PVB29-RS-20-CC-11 (and the broader PVB series) are Eaton Vickers (now Danfoss) high-performance variable displacement axial piston pumps designed for industrial and mobile hydraulic systems. Featuring a swashplate design with pressure compensator control, they automatically match system flow and pressure demands with high volumetric efficiency and compact construction. These pumps offer excellent drop-in interchangeability, with mounting flange and shaft dimensions fully matching genuine Eaton/Vickers units. Every unit undergoes 100% simulated operating condition testing to verify pressure stability, control response and durability.

Technical Specifications 

• Models: PVB15 RSY 31 CM11, PVB29-RS-20-CC-11 (series includes PVB5 to PVB45)
• Series: Eaton Vickers PVB variable displacement axial piston pump
• Geometric displacement: PVB15 ≈ 33.0 cm³/r (2.01 in³/r); PVB29 ≈ 61.60 cm³/r (3.76 in³/r)
• Continuous rated pressure: up to 140 bar (2000 psi with anti-wear mineral oil; some models up to 210 bar)
• Peak pressure: approx. 140–210 bar (depending on model and fluid)
• Maximum speed: up to 1800 r/min
• Control type: Pressure compensator (CM/CC, with adjustable maximum displacement stop)
• Rotation: Clockwise (R, viewed from shaft end)
• Shaft type: Keyed (Y type etc.)
• Mounting: Flange mounting
• Weight: PVB15 approx. 15 kg; PVB29 approx. 26 kg
• Recommended fluid: Anti-wear mineral oil

Key Technical Advantages

• Precise pressure compensator control: Automatically adjusts displacement to match system demand, reducing energy consumption and providing rapid response for variable load conditions.
• High volumetric and mechanical efficiency: Precision-machined swashplate and pistons maintain excellent efficiency and low internal leakage under high pressure.
• Superior interchangeability and serviceability: Mounting dimensions fully match original Eaton/Vickers pumps for direct drop-in replacement and easy system upgrades.
• Compact design and extended service life: High power density construction with quality bearings and wear-resistant materials ensures reliable continuous operation, validated by 100% simulated testing.

Application Areas

Machine tool hydraulic systems, injection molding machines, die-casting machines, hydraulic presses, construction machinery, industrial automation equipment, and hydraulic power units requiring variable flow and pressure control.

Expert Maintenance Tips

Maintain proper shaft alignment between the pump and motor to avoid additional radial or axial loads. Keep inlet pressure between 0–1.0 bar gauge. Use anti-wear mineral oil and maintain cleanliness. Periodically inspect compensator settings and piston components for wear. Fully purge air before initial start-up and avoid dry running. Do not exceed rated pressure or speed limits, and control oil temperature within the recommended range to maximize seal and bearing life.