NACHI Vane Pump VDR-1B-1A2-22 — Comprehensive Product Introduction
The NACHI VDR-1B-1A2-22 is a high-performance variable displacement vane pump designed to deliver precise hydraulic control, high energy efficiency, and low noise levels for modern industrial applications. As a member of NACHI’s renowned VDR Series, this model integrates advanced hydraulic engineering to provide stable pressure regulation, smooth operation, and long service life.
Engineered in Japan to meet global industrial standards, the VDR-1B-1A2-22 is suitable for equipment that demands precision and reliability—such as machine tools, plastic injection machines, press systems, and automated manufacturing lines.
1. Product Overview
The VDR-1B-1A2-22 is a pressure-compensated variable displacement vane pump that automatically adjusts its output flow to maintain consistent hydraulic pressure. This feature significantly reduces energy consumption, minimizes oil heating, and ensures long-term operational stability.
Compared with traditional fixed-displacement pumps, the VDR-1B-1A2-22 delivers superior energy efficiency and performance under fluctuating load conditions, making it ideal for continuous-duty environments.
2. Key Features
| Feature |
Description |
| Model Number |
VDR-1B-1A2-22 |
| Series |
NACHI VDR Series |
| Pump Type |
Variable displacement vane pump |
| Control Method |
Pressure-compensated displacement control |
| Mounting Type |
Flange mount (standard orientation) |
| Displacement Range |
8–25 cm³/rev (variable) |
| Flow Control |
Automatic adjustment by internal compensator |
| Rotation Direction |
Clockwise (viewed from shaft end) |
| Rated Pressure |
12 MPa (1740 psi) |
| Maximum Pressure |
14 MPa (2030 psi) |
| Nominal Flow Rate |
Approx. 22 L/min at 1800 rpm |
| Speed Range |
600–1800 rpm |
| Shaft Type |
Straight keyed shaft |
| Oil Type |
Mineral-based hydraulic oil (ISO VG32–68) |
| Viscosity Range |
20–400 mm²/s (cSt) |
| Temperature Range |
0 °C to +60 °C |
| Noise Level |
Below 60 dB(A) |
| Weight |
Approx. 9.2 kg |
| Cooling Efficiency |
High, due to aluminum alloy housing |
| Seal Material |
NBR (standard), optional Viton for high temperatures |
3. Structural Design and Components
The VDR-1B-1A2-22 integrates robust mechanical design, high-quality materials, and precision machining to ensure optimal performance and extended durability.
| Component |
Material / Description |
Function |
| Pump Housing |
Anodized aluminum alloy |
Lightweight and corrosion-resistant, ensures thermal stability |
| Rotor |
Hardened alloy steel |
Provides balanced rotation and smooth vane motion |
| Vanes |
High-grade tool steel |
Minimizes wear and ensures efficient sealing |
| Cam Ring |
Heat-treated steel |
Maintains constant flow and stable pressure |
| Pressure Compensator |
Integrated in housing |
Adjusts flow automatically according to system pressure |
| Shaft |
Carbon steel, precision-ground |
Provides accurate torque transmission with minimal vibration |
| Seals and O-rings |
NBR or optional Viton |
Prevents leakage under variable temperature and pressure |
| Bearings |
Dual radial ball bearings |
Absorbs side loads and ensures long service life |
The pump’s design minimizes vibration and fluid pulsation, leading to quieter operation and smoother hydraulic flow.
4. Performance Characteristics
| Operating Parameter |
Typical Value |
Description |
| Displacement Adjustment |
Variable between 8–25 cm³/rev |
Automatic pressure-based control |
| Flow Output at 1800 rpm |
22 L/min (nominal) |
Stable output under rated conditions |
| Rated Pressure |
12 MPa |
Continuous operating pressure |
| Maximum Pressure |
14 MPa |
Short-term peak pressure |
| Efficiency (Volumetric) |
92–94% |
High efficiency at rated speed |
| Efficiency (Mechanical) |
88–91% |
Smooth torque delivery |
| Response Time |
< 100 milliseconds |
Fast adaptation to pressure changes |
| Temperature Rise |
< 15 °C over ambient |
Excellent heat dissipation |
| Sound Level |
≤ 60 dB(A) |
Low-noise performance suitable for indoor systems |
5. Functional Highlights
The VDR-1B-1A2-22 features an intelligent balance between precision control and mechanical durability. Its performance benefits make it suitable for advanced hydraulic applications:
-
Energy-Saving Variable Displacement Control:
The pump automatically reduces output when the hydraulic system reaches the set pressure, minimizing energy consumption and motor load.
-
Compact, Lightweight Construction:
A high-strength aluminum housing reduces overall weight while maintaining rigidity and heat resistance.
-
Low Noise Design:
The balanced rotor and cam ring configuration reduce pulsation and mechanical resonance, ensuring smooth and quiet operation.
-
Stable Pressure Regulation:
The integrated compensator maintains steady output pressure even with fluctuating load demands.
-
High Durability:
Hardened internal components and precision-machined surfaces extend service intervals and minimize wear.
-
Ease of Maintenance:
The modular structure allows easy replacement of the vane cartridge, seals, and bearings without complete disassembly.
6. Typical Applications
The VDR-1B-1A2-22 is suitable for a broad range of industrial and mechanical systems requiring precision, reliability, and energy efficiency.
| Industry |
Typical Application |
| Machine Tools |
Hydraulic clamping, cutting feed control, and automatic tool changers |
| Plastic Injection Molding |
Hydraulic control for mold clamping and injection units |
| Hydraulic Presses |
Pressure regulation for pressing, bending, and forming |
| Textile and Paper Machinery |
Hydraulic tensioning and feed control systems |
| Industrial Automation |
Cylinder actuation and servo-hydraulic circuits |
| Power Transmission Systems |
Hydraulic drives in factory production lines |
| Testing Equipment |
Pressure and flow control in laboratory hydraulic benches |
Its adaptability, compact structure, and high efficiency make it a cost-effective solution for both OEM and retrofit systems.
7. Operating Guidelines
| Parameter |
Recommended Setting / Procedure |
| Mounting Position |
Horizontal, with shaft alignment ensured |
| Fluid Recommendation |
Clean mineral hydraulic oil, ISO VG32–68 |
| Filtration Requirement |
10 µm (absolute) or finer |
| System Pressure Adjustment |
Set via compensator screw; do not exceed 14 MPa |
| Startup Procedure |
Prime the pump fully before first operation to prevent dry running |
| Temperature Management |
Maintain oil between 30 °C and 50 °C |
| Suction Line Design |
Keep as short and straight as possible to reduce suction loss |
| Maintenance Schedule |
Inspect vane and seal condition every 4000–6000 hours of service |
Following these operational recommendations ensures consistent performance and prolongs pump life.
8. Maintenance and Service Parts
NACHI offers a comprehensive range of service kits for easy and cost-effective maintenance of the VDR-1B-1A2-22.
| Component |
Part Code / Description |
| Vane Cartridge Kit |
VDR1B-A2-22-CART |
| Seal Kit (Standard NBR) |
VDR1B-SK-NBR |
| Seal Kit (Viton for High Temp) |
VDR1B-SK-VIT |
| Bearing Set |
VDR1B-BS |
| Pressure Compensator Assembly |
VDR1B-PC-A2 |
| Overhaul Kit |
VDR1B-1A2-22-SET |
Using genuine NACHI parts ensures optimal hydraulic performance and preserves the pump’s service reliability.
9. Comparative Advantage
| Aspect |
VDR-1B-1A2-22 (Variable) |
Fixed Displacement Pump |
| Energy Use |
Automatically adjusts flow, saving power |
Constant output regardless of demand |
| Pressure Control |
Built-in pressure compensator |
Requires external relief valve |
| Noise Level |
Below 60 dB(A) |
Typically above 70 dB(A) |
| Efficiency |
Up to 93% volumetric |
80–85% typical |
| Maintenance |
Simple, modular components |
More complex system configuration |
| Heat Generation |
Low |
Higher due to constant full flow |
The VDR-1B-1A2-22 clearly outperforms traditional fixed-displacement pumps in efficiency, quietness, and cost-effectiveness.
10. Summary
The NACHI VDR-1B-1A2-22 is a compact, energy-efficient, and reliable variable displacement vane pump designed for precise hydraulic control and low-noise operation.
With its automatic pressure-compensation system, high volumetric efficiency, and robust construction, it provides long-term, trouble-free performance for industrial applications requiring stable hydraulic power.
Key Highlights:
-
Smooth and quiet operation with minimal pulsation
-
Energy-efficient design with pressure-based flow adjustment
-
Compact and lightweight structure for easy installation
-
High durability under continuous operation
-
Simple maintenance with modular components
Engineered for performance, reliability, and efficiency, the VDR-1B-1A2-22 embodies NACHI’s excellence in hydraulic technology, offering an ideal solution for precision-driven hydraulic systems worldwide.
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