Nachi Vane Pump VDC-2A-1A4 & VDC-2B-1A4 Parameter Specification | High-Pressure Variable Vane Pump

1. General Parameters of Nachi VDC-2A-1A4 & VDC-2B-1A4

• Brand: Nachi (Fujikoshi), a world-class manufacturer of hydraulic pumps
• Series: VDC Series High-Pressure Variable Volume Vane Pump
• Type: High-Pressure Variable Volume Vane Pump
• Flow Characteristics: Constant Discharge Type with stable cut-off characteristics
• Rotation Direction: Clockwise (rightward) when viewed from the shaft side (standard for Nachi VDC series)
• Applicable Fluid: Mineral oil (ISO VG32-68); compatible with water glycol (optional ceramic coating version VDC-HF)
• Operating Temperature Range: -20℃ ~ 80℃; warm-up operation required when oil temperature is below 15℃

2. Detailed Parameters of Nachi VDC-2A-1A4

• Displacement (Capacity): 30 cm³/rev
• No-Load Discharge Rate:
  • 1000 min⁻¹: 30 L/min (7.9 gpm)
  • 1200 min⁻¹: 36 L/min
  • 1500 min⁻¹: 45 L/min
  • 1800 min⁻¹: 54 L/min
• Pressure Adjustment Range: 7 ~ 10.3 MPa (71.4 ~ 105 kgf/cm²)
• Allowable Peak Pressure: 14 MPa (143 kgf/cm² = 2000 psi)
• Speed Range: 800 ~ 1800 min⁻¹ (max drive speed: 1800 min⁻¹; min drive speed: 800 min⁻¹)
• Mounting Method: Sub Plate Type (consistent with VDC-2A series design)
• Weight: 23.6 kg (52.00 lbs)

3. Detailed Parameters of Nachi VDC-2B-1A4

• Displacement (Capacity): 30 cm³/rev
• No-Load Discharge Rate:
  • 1000 min⁻¹: 30 L/min (7.9 gpm)
  • 1200 min⁻¹: 36 L/min
  • 1500 min⁻¹: 45 L/min
  • 1800 min⁻¹: 54 L/min
• Pressure Adjustment Range: 7 ~ 10.3 MPa (71.4 ~ 105 kgf/cm²)
• Allowable Peak Pressure: 14 MPa (143 kgf/cm² = 2000 psi)
• Speed Range: 800 ~ 1800 min⁻¹ (max drive speed: 1800 min⁻¹; min drive speed: 800 min⁻¹)
• Mounting Method: Flange Type Mounting
• Weight: 23.6 kg (52.00 lbs)

4. Core Features of Nachi VDC-2A-1A4 & VDC-2B-1A4 Vane Pumps

• High-Efficiency & Stable High-Pressure Operation: Equipped with innovative pressure control and pressure balance mechanisms, combined with the original 3-point ring support system, ensuring excellent performance at high pressures up to 14 MPa (2000 psi) with minimal power loss.
• Low Vibration & Quiet Operation: Adopts 3-point support system for the control piston and bias piston to enhance ring stability, minimizing vibration; upgraded with carbon fiber composite vanes, reducing noise to 58dB(A) @1500rpm.
• Outstanding Response & High-Precision: The innovative ring stopper eliminates excessive ring displacement, ensuring high-precision operation during startup, shutdown, and load changes; integrated pressure-flow dual sensors for real-time data upload (precision ±0.5%FS).
• Stable Discharge Rate: Revolutionary pressure compensator-type pressure control mechanism ensures highly stable fixed discharge rate even in the high-pressure range, with ±2% flow error tolerance.
• Easy Maintenance & Durability: Pressure adjustment and discharge rate adjustment mechanisms are located on the same side of the pump, simplifying maintenance; robust construction with high-quality materials ensures long service life and minimal maintenance requirements.
• Energy-Saving Design: Variable displacement design reduces energy consumption by 15%-30% compared to traditional vane pumps, compatible with servo motor systems for optimized flow control.

5. Important Notes for Nachi VDC-2A-1A4 & VDC-2B-1A4

• The thrust screw and stopper are precision-adjusted at the factory during assembly; do not touch or adjust them arbitrarily to avoid performance failure.
• An unload circuit is required when the motor is started under Y-delta condition; consult the Nachi agent for detailed unload circuit design.
• Before initial operation, put the pump discharge side into a no-load state, start and stop the motor repeatedly to bleed air, then run no-load for at least 10 minutes to ensure stable operation.
• The back pressure of the drain pipe due to pipe resistance should not exceed 0.1 MPa (14 psi); the drain pipe must be directly connected to below the tank fluid level to avoid oil leakage or pressure buildup.
• Use ISO VG32 oil for pressures ≤7 MPa and ISO VG68 oil for pressures ＞7 MPa, ensuring oil viscosity index is at least 90.