NACHI Vane Pump VDR-1B-1A2-21 — High-Performance Variable Displacement Hydraulic Pump
The NACHI VDR-1B-1A2-21 is a precision-engineered variable displacement vane pump designed to deliver efficient, quiet, and stable hydraulic power in demanding industrial applications. As part of the widely recognized VDR Series, this model incorporates NACHI’s advanced hydraulic control technology, providing automatic pressure compensation, energy savings, and long-term reliability. Its compact design, smooth operation, and durable construction make it ideal for use in machine tools, hydraulic presses, plastic injection molding machines, and industrial automation systems.
With its superior flow control and low-noise design, the VDR-1B-1A2-21 ensures maximum efficiency and performance stability under a variety of load conditions, contributing to optimized productivity and reduced operating costs.
1. Product Overview
The VDR-1B-1A2-21 is a pressure-compensated variable displacement vane pump, meaning it automatically adjusts its displacement to maintain a constant system pressure regardless of changes in load. When hydraulic pressure reaches the preset limit, the pump reduces output flow to prevent energy waste and excess heat generation.
This intelligent control design not only enhances energy efficiency but also improves the reliability of hydraulic systems. The VDR-1B-1A2-21 is particularly suitable for applications requiring precise pressure control, low noise, and continuous operation.
2. Technical Specifications
| Parameter |
Specification |
| Model Number |
VDR-1B-1A2-21 |
| Pump Type |
Variable displacement vane pump |
| Control Type |
Pressure-compensated automatic flow control |
| Mounting Type |
Flange-mounted |
| 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 |
| Operating Speed Range |
600–1800 rpm |
| Hydraulic Fluid |
Mineral oil (ISO VG32–68) |
| Viscosity Range |
20–400 mm²/s (cSt) |
| Operating Temperature |
0 °C – +60 °C |
| Suction Pressure |
0.03 MPa abs (minimum) |
| Noise Level |
≤ 60 dB(A) |
| Shaft Type |
Straight keyed shaft |
| Seal Material |
NBR (standard), Viton (optional) |
| Pump Weight |
Approx. 9.3 kg |
3. Design and Construction Features
NACHI’s advanced engineering ensures the VDR-1B-1A2-21 operates with precision and endurance. The pump is built using high-grade materials, ensuring optimal hydraulic performance and long-term resistance to wear.
| Component |
Material / Design Feature |
Function / Advantage |
| Pump Housing |
High-strength anodized aluminum |
Provides excellent rigidity, lightweight construction, and corrosion resistance |
| Cam Ring |
Hardened alloy steel |
Ensures smooth vane movement and stable pressure control |
| Rotor & Vanes |
Precision-machined tool steel |
Improves volumetric efficiency and extends service life |
| Shaft |
Heat-treated carbon steel |
Guarantees torque stability and resistance to fatigue |
| Bearings |
Dual radial ball bearings |
Reduces vibration and improves longevity |
| Pressure Compensator |
Integrated design |
Automatically adjusts displacement for stable pressure output |
| Seals |
NBR / Viton |
Prevents leaks and resists fluid degradation at high temperatures |
| Internal Finish |
Fine-polished surfaces |
Reduces friction and ensures low noise operation |
This combination of durable materials and precision manufacturing results in a pump that provides dependable, quiet, and efficient operation even in challenging industrial environments.
4. Performance Characteristics
| Parameter |
Value / Description |
| Rated Flow Output (at 1800 rpm) |
22 L/min |
| Pressure Control Accuracy |
±1% |
| Volumetric Efficiency |
92–94% |
| Mechanical Efficiency |
88–91% |
| Response Time |
< 100 ms |
| Noise Level |
≤ 60 dB(A) |
| Temperature Rise (Continuous Operation) |
< 15 °C above ambient |
| Expected Service Life |
20,000+ hours (under standard operation) |
The VDR-1B-1A2-21 achieves high efficiency and fast response with excellent thermal stability, ensuring consistent performance across long duty cycles.
5. Product Advantages
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Energy Efficiency:
The pressure-compensated design minimizes power consumption by automatically adjusting flow to meet demand, significantly reducing energy waste.
-
Stable Pressure Regulation:
The built-in compensator maintains precise pressure, ensuring smooth operation even with load fluctuations.
-
Low Noise and Vibration:
Optimized vane geometry and balanced rotor design produce exceptionally quiet and stable performance.
-
Compact and Lightweight:
The high-strength aluminum alloy casing offers compact dimensions without compromising strength.
-
Durability and Long Service Life:
Wear-resistant materials and precision machining deliver reliable performance for continuous use.
-
Low Heat Generation:
High efficiency reduces friction losses, keeping hydraulic oil cooler and prolonging fluid life.
-
Ease of Maintenance:
Modular construction allows quick replacement of internal parts such as vanes and seals.
6. Application Fields
The VDR-1B-1A2-21 serves as a reliable hydraulic power source in various industries requiring quiet, precise, and energy-efficient performance.
| Industry |
Typical Applications |
| Machine Tools |
Hydraulic clamping, feed control, and lubrication systems |
| Plastic Injection Molding |
Injection pressure and clamping unit control |
| Press Equipment |
Metal forming, stamping, and bending systems |
| Industrial Automation |
Robotic arms, conveyors, and hydraulic actuators |
| Textile and Paper Machinery |
Tension regulation and roller control |
| Testing Equipment |
Hydraulic pressure and flow testing systems |
| Hydraulic Power Units (HPUs) |
Core component for energy-efficient hydraulic stations |
The VDR-1B-1A2-21’s versatility and compact design make it ideal for both stationary and mobile hydraulic systems.
7. Operation and Maintenance Guidelines
| Parameter |
Recommendation |
| Installation Position |
Horizontal for optimal lubrication |
| Hydraulic Fluid |
Use clean mineral oil (ISO VG32–68) |
| Filtration Requirement |
≤ 10 µm absolute filter recommended |
| Operating Temperature |
Maintain 30–50 °C for ideal performance |
| Startup Procedure |
Prime the pump before starting to prevent dry running |
| Pressure Adjustment |
Adjust compensator slowly; do not exceed 14 MPa |
| Suction Line Design |
Keep short and direct to reduce pressure loss |
| Maintenance Interval |
Inspect seals and bearings every 4000–6000 hours |
Following these recommendations helps maintain stable performance and extends the service life of the pump.
8. Maintenance and Spare Parts
To ensure consistent performance and simplify servicing, NACHI offers genuine maintenance kits and spare parts for the VDR-1B-1A2-21.
| Component |
Replacement Part Code |
| Vane Cartridge Assembly |
VDR1B-1A2-21-CART |
| Seal Kit (Standard NBR) |
VDR1B-SK-NBR |
| Seal Kit (High Temp Viton) |
VDR1B-SK-VIT |
| Bearing Set |
VDR1B-BS |
| Pressure Compensator Assembly |
VDR1B-PC-A2 |
| Complete Overhaul Kit |
VDR1B-1A2-21-SET |
Using genuine NACHI components ensures proper fit, maintains efficiency, and prevents premature wear or system failure.
9. Comparison with Fixed Displacement Pumps
| Feature |
VDR-1B-1A2-21 (Variable Pump) |
Fixed-Displacement Pump |
| Energy Consumption |
Automatically adjusts output |
Constant energy use |
| Pressure Regulation |
Built-in automatic control |
Requires external valves |
| Noise Level |
≤ 60 dB(A) |
Typically 70–75 dB(A) |
| Heat Generation |
Low |
Higher due to continuous flow |
| Maintenance |
Simple and modular |
Complex and less efficient |
| System Efficiency |
Up to 94% |
Around 85% typical |
This variable pump outperforms conventional fixed pumps in energy use, efficiency, and operational reliability.
10. Conclusion
The NACHI VDR-1B-1A2-21 is a robust and efficient variable displacement vane pump designed for precision hydraulic systems. Its pressure-compensated automatic control ensures stable operation, energy savings, and quiet performance.
Key Highlights:
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Intelligent displacement control with minimal energy waste
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Compact, lightweight, and durable design
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Smooth, quiet operation suitable for precision applications
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Extended service life and easy maintenance
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High efficiency with reduced heat and noise
With superior engineering and proven reliability, the VDR-1B-1A2-21 continues to be a preferred solution for industries that demand accuracy, efficiency, and long-term hydraulic stability.
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