VDC-2A-1A5-20 Nachi Variable Vane Pump 54L/min 140bar

Product Overview

The VDC-1A/1B/2A/2B/3A/3B series (including VDC-2A-1A5-20, VDC-1B-1A4-E35 and VDC-1B-2A3) belongs to the Nachi high-pressure variable volume vane pump range. Featuring innovative pressure control and pressure balance mechanisms combined with an original 3-point ring support system, these pumps deliver highly efficient and stable high-pressure operation. 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 Nachi VDC units and undergo 100% simulated operating-condition testing. Precision machining and high-quality materials ensure stable flow, low noise and fast response under high-pressure conditions for machine tools, injection molding machines and industrial equipment.

Technical Specifications 

(Based on official Nachi technical data; theoretical values excluding efficiency and tolerances)

• Series: VDC-1A/1B, VDC-2A/2B, VDC-3A/3B
• Typical models:
  • VDC-2A-1A5-20: Ring size 1, pressure code 5, design 20, unloading flow approx. 54 L/min @ 1800 r/min
  • VDC-1B-1A4-E35: Ring size 1, pressure code 4, flange mounting, pressure range approx. 5–10.5 MPa
  • VDC-1B-2A3: Ring size 2, pressure code 3
• Geometric displacement: VDC-1 approx. 16.7–22 cm³/r; VDC-2 approx. 30–39 cm³/r; VDC-3 larger
• Continuous pressure: up to 14 MPa (140 bar / approx. 2000 psi)
• Peak pressure: 21 MPa (approx. 3000 psi)
• Speed range: 800–1800 r/min
• Control: Pressure-compensated variable displacement (flow automatically adjusts with pressure); pressure adjustment ranges by codes 2/3/4/5
• Mounting: A = foot mounting, B = flange mounting (SAE A etc.)
• Approximate weight: 9.5–21 kg for VDC-1; approx. 25 kg for VDC-2
• Other: 3-point ring support system, low vibration and noise, side-by-side adjustment mechanisms for easy maintenance

Key Technical Advantages

1. Innovative pressure control and 3-point ring support: Unique 3-point ring support dramatically improves high-pressure stability; pressure compensator ensures constant discharge even at high pressure.
2. High-pressure efficiency and low-noise design: Continuous pressure up to 14 MPa with peak 21 MPa; low vibration, low noise and minimal power loss.
3. Fast response and easy maintenance: Rapid start/stop response; pressure and flow adjustment mechanisms located on the same side for simplified handling.
4. 100% drop-in interchangeability and simulated-condition testing: Overall dimensions, mounting interfaces and performance curves match genuine Nachi units exactly for direct replacement. Every unit undergoes 100% simulated operating-condition testing to verify pressure, flow, efficiency and sealing performance.
5. Flexible mounting and pressure configurations: Foot or flange mounting options plus multiple pressure adjustment ranges to suit diverse system requirements.

Application Areas

• Machine tools and machining centers: clamping, feed and auxiliary circuits
• Injection molding and die-casting machines: main and auxiliary hydraulic systems
• Industrial equipment: presses, bending machines, general hydraulic power units
• Precision equipment requiring high-pressure variable energy-saving oil supply

Expert Maintenance Tips

• Before installation, confirm mounting type (A/B) and rotation match the host machine. Ensure adequate suction line diameter and proper sealing to avoid cavitation.
• Use 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.
• Regularly check pressure and flow adjusting screws to keep settings stable; avoid prolonged over-pressure operation.
• When replacing internal components, maintain strict cleanliness; perform air bleeding and low-pressure test run after assembly.
• Perform preventive inspections every 2000–4000 hours depending on duty cycle; monitor noise, temperature and any flow changes, and service promptly.