NACHI Vane Pump VDR-1B-2A2-22 — Precision Hydraulic Power for Industrial Applications
The NACHI VDR-1B-2A2-22 is a high-performance variable displacement vane pump designed for precision control, durability, and superior energy efficiency. As part of NACHI’s second-generation VDR Series, this model combines modern hydraulic engineering with mechanical robustness to provide stable pressure control, quiet operation, and reduced energy consumption.
Engineered to meet the rigorous demands of industrial hydraulic systems, the VDR-1B-2A2-22 is ideal for applications such as machine tools, plastic injection molding equipment, hydraulic presses, and automated production machinery. Its efficient variable displacement design ensures optimal fluid delivery, reduced noise, and minimized power loss under varying load conditions.
1. Product Overview
The VDR-1B-2A2-22 is a pressure-compensated variable displacement vane pump that automatically regulates flow based on system pressure requirements. When the hydraulic circuit reaches its preset pressure, the pump reduces displacement, lowering energy consumption and preventing heat buildup.
This model reflects NACHI’s commitment to designing compact, quiet, and reliable pumps that enhance the performance of modern hydraulic systems while reducing operational costs.
2. Technical Specifications
| Parameter |
Specification |
| Model Number |
VDR-1B-2A2-22 |
| Series |
VDR Series (2nd Generation) |
| Pump Type |
Variable Displacement Vane Pump |
| Control Type |
Pressure-compensated flow regulation |
| Mounting Type |
Flange-mounted (horizontal) |
| Rotation Direction |
Clockwise (viewed from shaft end) |
| Displacement Range |
8–25 cm³/rev (variable) |
| Rated Pressure |
12 MPa (1740 psi) |
| Maximum Pressure |
14 MPa (2030 psi) |
| Flow Rate at 1800 rpm |
22–25 L/min (variable) |
| Operating Speed Range |
600–1800 rpm |
| Fluid Type |
Mineral hydraulic oil (ISO VG32–68) |
| Viscosity Range |
20–400 mm²/s (cSt) |
| Operating Temperature |
0 °C to +60 °C |
| Noise Level |
≤ 60 dB(A) |
| Suction Pressure |
Minimum 0.03 MPa absolute |
| Shaft Type |
Straight keyed shaft |
| Seal Material |
NBR standard, Viton optional |
| Weight |
Approx. 9.5 kg |
3. Design and Structural Features
The VDR-1B-2A2-22 is built using precision-machined components that provide superior performance, long life, and quiet operation. Every part is engineered for stability, efficiency, and minimal wear, ensuring smooth hydraulic operation.
| Component |
Material / Feature |
Function / Benefit |
| Pump Casing |
Anodized aluminum alloy |
Provides high strength, excellent heat dissipation, and corrosion resistance |
| Cam Ring |
Hardened alloy steel |
Ensures precise vane movement and even pressure distribution |
| Rotor and Vanes |
High-precision steel |
Reduces internal leakage and increases volumetric efficiency |
| Pressure Compensator |
Integrated control valve |
Automatically maintains constant pressure regardless of load variation |
| Shaft |
Heat-treated carbon steel |
Delivers torque stability and long fatigue life |
| Bearings |
Dual radial ball bearings |
Reduce vibration and ensure smooth operation |
| Seals |
NBR or Viton |
Ensure reliable sealing and resistance to hydraulic fluid degradation |
| Surface Finish |
Fine precision machining |
Provides minimal friction loss and quiet operation |
This robust and compact design makes the pump suitable for high-duty cycles in continuous industrial environments.
4. Performance Characteristics
| Performance Metric |
Typical Value / Description |
| Flow Control Range |
8–25 cm³/rev variable |
| Rated Flow (at 1800 rpm) |
Approx. 22 L/min |
| Pressure Regulation Accuracy |
±1% |
| Volumetric Efficiency |
92–94% |
| Mechanical Efficiency |
88–91% |
| Response Time |
< 100 milliseconds |
| Sound Level |
≤ 60 dB(A) under rated conditions |
| Temperature Rise (Continuous Use) |
< 15 °C above ambient |
| Service Life |
Exceeds 20,000 hours (under standard operation) |
The advanced pressure-compensating control mechanism ensures fast response and stable hydraulic output, minimizing system oscillations and maintaining smooth performance.
5. Key Product Features
-
Energy-Saving Variable Displacement Control:
The pump automatically adjusts output flow based on system demand, reducing unnecessary power consumption and increasing energy efficiency.
-
Stable Pressure Compensation:
Integrated control mechanism maintains constant system pressure even under fluctuating loads, ensuring consistent performance.
-
Low Noise and Vibration:
NACHI’s optimized rotor design and tight machining tolerances minimize mechanical noise and hydraulic pulsation, achieving quiet operation ideal for precision machinery.
-
Compact and Lightweight Construction:
The high-strength aluminum alloy body provides excellent rigidity while keeping the pump lightweight and easy to install.
-
Long Service Life:
Hardened wear components and precision bearings contribute to extended operational reliability even under demanding duty cycles.
-
Reduced Heat Generation:
Efficient hydraulic flow paths reduce internal energy losses and fluid temperature rise, promoting longer system life.
-
Ease of Maintenance:
Modular design enables quick access for component replacement, minimizing downtime and simplifying service.
6. Applications
The VDR-1B-2A2-22 is widely used across a variety of industries where performance, efficiency, and reliability are crucial.
| Industry |
Application Example |
| Machine Tools |
Hydraulic control for clamping, feeding, and tool changers |
| Plastic Injection Molding |
Pressure regulation for injection, clamping, and ejector systems |
| Press Machinery |
Forming, stamping, and metal bending operations |
| Industrial Robotics |
Hydraulic actuation and movement control |
| Textile and Paper Machinery |
Tension and roller drive systems |
| Automated Manufacturing Lines |
Hydraulic drives and cylinder control |
| Testing Equipment |
Pressure and flow control in hydraulic test systems |
Its versatility allows seamless integration into both new and retrofit hydraulic installations.
7. Operating Guidelines
| Parameter |
Recommendation |
| Installation Orientation |
Horizontal mounting preferred for optimum lubrication |
| Fluid Type |
Clean mineral-based hydraulic oil (ISO VG32–68) |
| Filtration Requirement |
≤ 10 µm absolute filter recommended |
| Operating Temperature Range |
Maintain oil temperature between 30–50 °C |
| Suction Piping |
Keep short and straight to minimize pressure drop |
| Startup Procedure |
Prime the pump with oil before initial operation to prevent dry running |
| Pressure Adjustment |
Adjust slowly via compensator screw; do not exceed 14 MPa |
| Maintenance Interval |
Check vanes, seals, and bearings every 4000–6000 hours of use |
Following these guidelines ensures stable performance, prevents cavitation, and maximizes service life.
8. Maintenance and Spare Parts
NACHI offers comprehensive maintenance and service kits to ensure consistent performance and quick part replacement for the VDR-1B-2A2-22.
| Component |
Service Kit / Part Code |
| Vane Cartridge Kit |
VDR1B-2A2-22-CART |
| Seal Kit (Standard NBR) |
VDR1B-SK-NBR |
| Seal Kit (High-Temperature Viton) |
VDR1B-SK-VIT |
| Bearing Set |
VDR1B-BS |
| Pressure Compensator Assembly |
VDR1B-PC-A2 |
| Complete Overhaul Kit |
VDR1B-2A2-22-SET |
Using genuine NACHI parts ensures full compatibility, preserves hydraulic efficiency, and prevents premature wear.
9. Comparative Advantages
| Feature |
VDR-1B-2A2-22 (Variable) |
Fixed-Displacement Pump |
| Energy Efficiency |
Flow adjusts automatically to load, reducing energy use |
Constant energy consumption regardless of demand |
| Pressure Control |
Built-in compensator maintains pressure |
Requires external control valves |
| Noise Level |
≤ 60 dB(A) |
Typically 70–75 dB(A) |
| Heat Generation |
Low due to efficient control |
High from continuous operation |
| Maintenance |
Simple, modular construction |
More complex with external components |
| Service Life |
Long due to reduced mechanical stress |
Shorter due to constant full-load operation |
The VDR-1B-2A2-22 demonstrates clear superiority in both operational performance and lifecycle economy.
10. Conclusion
The NACHI VDR-1B-2A2-22 stands as a benchmark in energy-efficient hydraulic technology. With its pressure-compensated variable displacement design, it provides stable flow, reduced noise, and extended durability while minimizing energy consumption.
Key Benefits:
-
Intelligent automatic displacement control
-
Quiet and vibration-free performance
-
Compact and durable structure
-
Simple maintenance and long operational life
-
High thermal and hydraulic efficiency
By combining engineering precision and NACHI’s commitment to quality, the VDR-1B-2A2-22 offers a superior solution for modern hydraulic systems that require precise pressure control, efficiency, and reliability across a wide range of industrial applications.
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