20VQ8A-1C30 Vickers VQ Series Hydraulic Vane Pump 27.4cc 210bar

Product Overview

The 20VQ / 25VQ / 35VQ / 45VQ / 50VQ series are classic Eaton Vickers (now Danfoss) Intra-Vane fixed-displacement vane pumps engineered for high-pressure mobile applications. These units are precision direct interchanges for original Vickers VQ models including 20VQ8A-1C30, 20VQ9A-1C30, 25VQ12A-1B20 and 25VQ14A-11A20. Featuring a 10-vane hydraulically balanced intra-vane design and floating side plates that automatically compensate for clearance, they deliver high volumetric efficiency, low noise and long service life under demanding speed and pressure conditions. Every pump undergoes 100% simulated duty-cycle testing to guarantee exact match of mounting dimensions, shaft options, port orientation and performance curves.

Technical Specifications 

• Models: 20VQ8A-1C30 / 20VQ9A-1C30 / 25VQ12A-1B20 / 25VQ14A-11A20 (and full 20VQ / 25VQ / 35VQ / 45VQ / 50VQ range)
• Geometric displacement: 20VQ8 = 27.4 cm³/r (1.67 in³/r); 20VQ range typically 18.0–45.9 cm³/r; 25VQ12 = 40.2 cm³/r (2.45 in³/r); 25VQ14 = 45.4 cm³/r (2.77 in³/r)
• Continuous rated pressure: 210 bar (3000 psi) for smaller displacements; 160–175 bar for larger sizes
• Peak pressure: approximately 228–241 bar depending on model
• Maximum speed: 2700 r/min (20VQ / 25VQ smaller sizes); 2500–2200 r/min for larger displacements
• Minimum recommended speed: approx. 600 r/min
• Control type: Fixed displacement (no variable control); straight-keyed or splined shaft options; configurable port positions (A/B/C/D relative to inlet)
• Approximate weight: 20VQ ≈ 11.8 kg; 25VQ ≈ 14.5 kg
• Ports: Standard SAE 4-bolt flange
• Seals: Standard or Viton (F3) optional

Key Technical Advantages

1. Intra-Vane hydraulically balanced design: Pressure oil under the vanes reduces wear against the cam ring, enabling higher continuous pressure and speed with extended life.
2. Floating bi-metallic side plates with automatic clearance compensation: Maintain minimal internal leakage under high pressure and speed, delivering volumetric efficiencies typically above 90%.
3. Precision machining for true interchangeability: Rotor, ring and side-plate tolerances match original Vickers dimensions, shaft ends and port locations exactly—direct drop-in replacement with no piping or mounting modifications.
4. Low noise and high reliability: 10-vane configuration minimizes flow ripple; quality bearings and seals support continuous mobile duty.
5. 100% simulated operating-condition testing: Full pressure, flow, leakage and noise verification ensures performance curve consistency with OEM units.

Application Areas

Construction machinery (excavators, wheel loaders, dozers), forklifts and material-handling equipment, refuse trucks and municipal vehicles, agricultural machinery, aerial work platforms, hydraulic power units and medium-to-high-pressure mobile hydraulic systems.

Expert Maintenance Tips

Ensure precise shaft alignment during installation to avoid excessive radial or axial loads. Maintain inlet pressure between 0 and 0.34 bar to prevent cavitation. Use anti-wear hydraulic oil (SAE 10W or equivalent viscosity recommended); target system cleanliness of ISO 18/16/13 or better. Fully bleed air before initial start-up and monitor temperature and leakage during break-in. Cartridge kits can be replaced without removing the pump body from the machine, minimizing downtime. Periodically inspect shaft seals and bearing lubrication; never allow dry running.

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