25VQ-21A-1C20 Vickers Eaton VQ Vane Pump 67.5cc 210bar

Product Overview

The 20VQ, 25VQ, 35VQ, 45VQ series and double-pump combinations such as 2520VQ, 3520VQ, 3525VQ (including 25VQ-21A-1C20) belong to the Eaton Vickers (now Danfoss) VQ series of high-pressure, high-speed mobile vane pumps. Featuring the Intra-Vane balanced design optimized for mobile equipment, these pumps support higher speeds and pressures. We specialize in the R&D and manufacturing of high-pressure pumps, motors and valve blocks. Our products offer 100% drop-in interchangeability with genuine Vickers/Eaton VQ units and undergo 100% simulated operating-condition testing. Precision machining and high-quality materials ensure stable flow output under high-pressure and high-speed conditions for construction, agricultural and mobile hydraulic systems.

Technical Specifications 

(Based on official Eaton Vickers engineering data; theoretical values excluding efficiency and tolerances)

• Series: 20VQ, 25VQ, 35VQ, 45VQ (single); 2520VQ, 3520VQ, 3525VQ etc. (double)
• Typical model: 25VQ-21A-1C20: Displacement 67.5 cm³/r (4.12 in³/r), SAE rated flow 21 USGPM @ 1200 r/min
• Other reference displacements:
  • 25VQ series: 33–67.5 cm³/r
  • 35VQ series: 68–121 cm³/r
  • 45VQ series: approx. 138–193 cm³/r
• Continuous pressure: 210 bar (3000 psi) with anti-wear hydraulic oil
• Peak pressure: Higher intermittent values possible depending on ring size
• Maximum speed: 2500–2700 r/min for 25VQ; approx. 2400–2500 r/min for 35VQ; approx. 2200 r/min for 45VQ
• Control: Fixed displacement, Intra-Vane balanced design; rotation selectable (R = clockwise, L = counterclockwise, set at assembly)
• Mounting & ports: SAE B/C 2-bolt flange; A = SAE 4-bolt flange ports; Shaft 1 = keyed, 11 = splined etc.
• Port position: A = opposite, C = in-line etc. available
• Approximate weight: 14.5 kg for 25VQ
• Other: Design 20 and subsequent compatible designs; optimized for high-speed mobile applications

Key Technical Advantages

1. Intra-Vane precision balanced design: Internal vane structure fully balances radial forces, minimizing bearing loads for high volumetric efficiency and long life, especially suited to high-speed mobile use.
2. High-pressure high-speed and low-noise operation: Continuous pressure up to 210 bar with speeds to 2700 r/min; optimized vane geometry delivers smooth, quiet running.
3. Long-life cartridge and easy maintenance: Cartridge design allows quick replacement; high-quality materials and precision machining ensure excellent wear resistance and reliability.
4. 100% drop-in interchangeability and simulated-condition testing: Overall dimensions, mounting interfaces, shaft types, port positions and performance curves match genuine Vickers/Eaton units exactly for direct replacement. Every unit undergoes 100% simulated operating-condition testing to verify pressure, flow, efficiency and sealing performance.
5. Flexible single and double configurations: Single pumps and double combinations (e.g. 2520VQ, 3525VQ) available to meet multi-circuit requirements.

Application Areas

• Construction machinery: wheel loaders, excavator auxiliary systems, dump trucks
• Agricultural and forestry equipment: tractors, harvesters
• Mobile vehicles: special vehicles, material handling equipment
• Industrial mobile applications: high-pressure high-speed fixed-displacement hydraulic circuits

Expert Maintenance Tips

• Before installation, confirm rotation and port position match the host machine. Ensure adequate suction line diameter and proper sealing to avoid cavitation.
• Use anti-wear hydraulic oil with cleanliness meeting ISO 4406 18/16/13 or better; maintain suitable viscosity at operating temperature. Run at low speed during cold starts.
• Keep inlet pressure within recommended limits; regularly check shaft seals and external drain condition.
• When replacing the cartridge, maintain strict cleanliness and correct assembly sequence; perform air bleeding and low-pressure test run afterward.
• Perform preventive inspections every 2000–4000 hours depending on duty cycle; monitor noise, temperature and any flow changes, and replace worn cartridges promptly.

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