NACHI Vane Pump VDR-1B-1A5-22 — Precision, Performance, and Energy Efficiency in One Compact Design
The NACHI VDR-1B-1A5-22 is a premium variable displacement vane pump designed to deliver consistent hydraulic power with precision control and remarkable energy efficiency. As part of NACHI’s high-performance VDR Series, this model incorporates advanced engineering for smooth operation, low noise, and long-term reliability. The VDR-1B-1A5-22 provides stable pressure regulation, making it an ideal solution for machine tools, hydraulic presses, plastic molding systems, and industrial automation machinery.
With an automatic pressure-compensating mechanism, this pump maintains optimal performance under varying load conditions, effectively reducing energy loss and ensuring constant hydraulic output. NACHI’s reputation for durability and precision engineering is reflected in every detail of this model.
1. Product Overview
The VDR-1B-1A5-22 is a pressure-compensated variable displacement vane pump that automatically adjusts oil delivery according to the system’s pressure demand. This control feature prevents unnecessary power consumption, reduces heat generation, and enhances system efficiency.
Its compact and lightweight design allows for flexible installation in tight industrial layouts without compromising hydraulic performance or durability.
2. Technical Specifications
| Parameter |
Specification |
| Model |
VDR-1B-1A5-22 |
| Pump Type |
Variable displacement vane pump |
| Series |
NACHI VDR Series |
| Control Type |
Pressure-compensated automatic displacement 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) |
| Nominal Flow Rate at 1800 rpm |
Approx. 22–25 L/min |
| Speed Range |
600–1800 rpm |
| Fluid Type |
Mineral-based hydraulic oil (ISO VG32–68) |
| Viscosity Range |
20–400 mm²/s (cSt) |
| Operating Temperature Range |
0 °C – 60 °C |
| Noise Level |
≤ 60 dB(A) |
| Suction Pressure |
0.03 MPa abs (minimum) |
| Shaft Type |
Straight keyed shaft |
| Seal Material |
NBR (standard), Viton (optional) |
| Pump Weight |
Approx. 9.8 kg |
3. Design and Construction Features
The VDR-1B-1A5-22 is designed with high mechanical precision, combining performance, durability, and ease of maintenance. Its components are manufactured using premium materials to ensure consistent hydraulic operation even under continuous-duty cycles.
| Component |
Material / Design Feature |
Function / Advantage |
| Pump Casing |
Anodized aluminum alloy |
Strong, lightweight, and corrosion-resistant |
| Cam Ring |
Hardened alloy steel |
Provides smooth vane operation and stable pressure control |
| Rotor & Vanes |
Precision-machined steel |
High volumetric efficiency and low internal leakage |
| Pressure Compensator |
Built-in control valve |
Automatically maintains constant system pressure |
| Drive Shaft |
Heat-treated carbon steel |
Ensures torque stability and vibration resistance |
| Bearings |
Dual radial ball bearings |
Smooth rotation and long service life |
| Seals |
NBR (standard) / Viton (optional) |
Leak prevention and chemical compatibility |
| Surface Finish |
Fine-machined for minimal friction |
Reduces noise and improves efficiency |
Each component works in harmony to produce a durable, quiet, and energy-efficient pump suitable for continuous industrial use.
4. Performance Characteristics
| Performance Metric |
Typical Value / Description |
| Rated Flow (at 1800 rpm) |
22–25 L/min |
| Pressure Regulation Accuracy |
±1% |
| Volumetric Efficiency |
93–95% |
| Mechanical Efficiency |
88–91% |
| Response Time |
< 100 milliseconds |
| Noise Level |
≤ 60 dB(A) |
| Temperature Rise (Continuous Duty) |
< 15 °C above ambient |
| Service Life |
Over 20,000 hours (under rated conditions) |
The advanced hydraulic control system ensures minimal pulsation, stable flow delivery, and rapid response during pressure fluctuations, resulting in consistent performance and quiet operation.
5. Key Features and Benefits
-
Energy Efficiency:
The VDR-1B-1A5-22 reduces power consumption by automatically adjusting displacement based on system load, achieving up to 30% energy savings compared to conventional fixed pumps.
-
Quiet Operation:
The advanced rotor design and precision assembly reduce vibration and noise, creating a quiet hydraulic environment suitable for factory automation and machine tools.
-
Pressure Stability:
Integrated pressure-compensating control ensures smooth operation and accurate pressure maintenance under fluctuating loads.
-
Compact and Lightweight:
The high-strength aluminum housing minimizes overall pump weight without compromising durability, simplifying installation in compact spaces.
-
Durability and Longevity:
Hardened components and precision seals ensure extended service life even under continuous high-pressure conditions.
-
Low Heat Generation:
Efficient internal flow design minimizes friction and heat buildup, preserving hydraulic fluid quality.
-
Easy Maintenance:
Modular construction allows for quick inspection and replacement of the vane cartridge and seal kit without full disassembly.
6. Application Areas
The VDR-1B-1A5-22 is widely used in hydraulic systems requiring precision control, high efficiency, and reliable operation.
| Industry |
Typical Application |
| Machine Tools |
Hydraulic clamping, spindle control, tool changers |
| Plastic Injection Molding |
Hydraulic control for injection, clamping, and ejector mechanisms |
| Press Machinery |
Stamping, forming, and bending systems |
| Automation Equipment |
Hydraulic drives and actuators |
| Material Handling Systems |
Conveyor lifters, clamps, and positioning arms |
| Textile and Paper Machinery |
Roller drive and tension regulation |
| Testing and Calibration Systems |
Hydraulic control for test benches and laboratory systems |
The versatility of the VDR-1B-1A5-22 makes it ideal for both new installations and retrofitted hydraulic systems seeking enhanced energy efficiency.
7. Operating Recommendations
| Parameter |
Recommended Practice |
| Mounting Position |
Horizontal preferred for optimal lubrication |
| Hydraulic Fluid |
Use clean mineral oil (ISO VG32–68) |
| Filtration Requirement |
≤ 10 µm absolute filter recommended |
| Operating Temperature |
Maintain 30 °C – 50 °C for best performance |
| Startup Procedure |
Prime pump before operation to prevent dry running |
| Pressure Adjustment |
Turn compensator screw gradually; do not exceed 14 MPa |
| Suction Line Design |
Keep short and direct to prevent cavitation |
| Maintenance Interval |
Inspect vanes, seals, and bearings every 4000–6000 hours |
Following these operational guidelines ensures stable performance, minimal wear, and extended service life.
8. Maintenance and Replacement Parts
NACHI provides comprehensive maintenance kits and replacement parts for the VDR-1B-1A5-22, ensuring consistent performance and ease of servicing.
| Component |
Part Code / Description |
| Vane Cartridge Kit |
VDR1B-1A5-22-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-A5 |
| Complete Overhaul Kit |
VDR1B-1A5-22-SET |
Using genuine NACHI parts guarantees maximum reliability, proper fitment, and long-term efficiency.
9. Comparison with Fixed Displacement Pumps
| Feature |
VDR-1B-1A5-22 (Variable Pump) |
Fixed Displacement Pump |
| Energy Efficiency |
Automatically adjusts to load |
Constant energy consumption |
| Pressure Control |
Built-in compensator |
Requires external relief valves |
| Noise Level |
≤ 60 dB(A) |
70–75 dB(A) typical |
| Heat Generation |
Low |
High due to constant flow |
| Maintenance |
Simple and modular |
More complex, external components |
| System Efficiency |
High (up to 95%) |
Moderate (~85%) |
This comparison highlights the superior efficiency and flexibility of NACHI’s variable displacement design.
10. Conclusion
The NACHI VDR-1B-1A5-22 embodies precision, reliability, and efficiency in hydraulic power delivery. With its pressure-compensated variable displacement design, it optimizes system performance while reducing noise, energy consumption, and operational costs.
Key Highlights:
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Intelligent displacement control for energy efficiency
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Low noise and vibration-free operation
-
Compact and lightweight aluminum construction
-
Long service life and easy maintenance
-
Ideal for modern hydraulic and automation systems
Built with NACHI’s proven engineering expertise, the VDR-1B-1A5-22 is a trusted solution for high-performance hydraulic applications that demand stability, durability, and maximum efficiency in every operation.
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