3520VQ32A5 3520VQ32A6 3520VQ32A7 Eaton Vickers VQ Double Vane Pump

Product Overview

The 3520VQ32A5, 3520VQ32A6 and 3520VQ32A7 (and the broader 2520VQ, 3520VQ, 3525VQ, 4520VQ, 4525VQ, 4535VQ series) are Eaton Vickers VQ high-performance tandem fixed-displacement vane pumps engineered for demanding applications such as injection molding machines. Featuring the 10-vane Intra-Vane cartridge design, they deliver independent dual-circuit flow from the shaft-end and cover-end sections, ideal for injection, clamping and ejection circuits. These pumps offer excellent drop-in interchangeability with genuine Eaton/Vickers units, matching flange, shaft and port dimensions exactly. Every unit undergoes 100% simulated operating condition testing to verify volumetric efficiency, pressure stability and durability.

Technical Specifications 

• Models: 3520VQ32A5, 3520VQ32A6, 3520VQ32A7 (series includes 2520VQ, 3520VQ, 3525VQ, 4520VQ, 4525VQ, 4535VQ)
• Series: Eaton Vickers VQ tandem fixed-displacement vane pump
• Shaft-end geometric displacement: code 32 approximates standard code 30 ≈ 97.7 cm³/r (5.96 in³/r)
• Cover-end geometric displacement: code 5 ≈ 18.0 cm³/r (1.10 in³/r); A6/A7 are similar small-displacement or flow-control variants
• Continuous rated pressure: up to 210 bar (3000 psi) with anti-wear mineral oil
• Peak pressure: approx. 228 bar (3300 psi) intermittent
• Maximum speed: shaft-end up to approx. 2500 r/min; cover-end up to approx. 2500 r/min (based on 0 bar inlet pressure)
• Minimum speed: approx. 600 r/min
• Control type: Fixed displacement (Intra-Vane cartridge design; some models with optional flow-control cover)
• Rotation: Standard clockwise (viewed from shaft end); counterclockwise optional
• Port configuration: Primarily A (SAE 4-bolt flange)
• Shaft options: Keyed or splined
• Approximate weight: 34 kg
• Recommended fluid: Anti-wear mineral oil (e.g. SAE 10W)

Key Technical Advantages

• Intra-Vane precision cartridge design: The 10-vane configuration with floating side plates automatically compensates end-face clearance, maintaining high volumetric efficiency and low internal leakage under high pressure for responsive injection molding cycles.
• High-speed and high-pressure capability: Continuous pressure reaches 210 bar with maximum speeds of 2500 r/min and above, supporting rapid injection and holding pressure requirements.
• Superior interchangeability and serviceability: Cartridge construction allows rapid replacement of rotor, vanes and cam ring; mounting dimensions fully match original Eaton/Vickers pumps for direct drop-in replacement.
• Low noise and extended service life: Hydraulically balanced vane design reduces radial forces and vibration; quality bearings and wear-resistant materials, validated by 100% simulated testing, ensure reliable continuous operation.

Application Areas

Injection molding machine main hydraulic systems (injection, clamping and ejection circuits), die-casting machines, hydraulic presses, machine tool feed systems, construction machinery dual-circuit systems, and fixed or mobile hydraulic power units requiring high-speed, high-pressure tandem vane pumps.

Expert Maintenance Tips

Maintain proper shaft alignment between the pump and motor/drive to avoid additional radial or axial loads. Keep inlet pressure between 0–0.34 bar gauge (maximum 1.38 bar); inlet depression should not exceed 0.17 bar. Use anti-wear mineral oil and maintain cleanliness (recommended filtration ≤10–25 μm). Periodically inspect cartridge components for wear and replace vanes/cam ring with genuine or equivalent-precision parts. 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.