NACHI Vane Pump VDR-1B-1A1-U-1586K — Technical Product Introduction
The NACHI VDR-1B-1A1-U-1586K is a precision-engineered variable displacement vane pump designed to deliver efficient hydraulic power with stable pressure control, quiet operation, and long service life. As part of NACHI’s renowned VDR Series, this model incorporates advanced variable-flow technology, offering excellent energy efficiency and consistent performance across a wide range of industrial applications.
Built with NACHI’s long-standing expertise in hydraulic systems, the VDR-1B-1A1-U-1586K provides superior control for modern machinery that demands precision, durability, and energy-conscious performance. It is particularly suitable for applications in machine tools, plastic injection molding, presses, and industrial automation systems.
1. Product Overview
The VDR-1B-1A1-U-1586K belongs to NACHI’s VDR (Variable Displacement Regulated) series, which is known for integrating pressure-compensated control mechanisms. This design allows the pump to automatically adjust its output flow to maintain a constant system pressure, reducing unnecessary energy loss and heat buildup.
This model is compact, lightweight, and designed for high reliability under continuous-duty operation. It features a balanced rotor, low-noise vane system, and optimized pressure compensator, ensuring smooth hydraulic performance and high volumetric efficiency.
2. Key Specifications
| Parameter |
Specification |
| Model |
VDR-1B-1A1-U-1586K |
| Series |
VDR Series (Variable Displacement Vane Pump) |
| Pump Type |
Pressure-compensated, variable displacement |
| 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) |
| Rated Speed |
1800 rpm |
| Permissible Speed Range |
600 – 1800 rpm |
| Flow Rate at 1800 rpm |
20 – 25 L/min (variable) |
| Suction Pressure |
0.03 MPa abs (minimum) |
| Fluid Type |
Mineral-based hydraulic oil (ISO VG32–68) |
| Viscosity Range |
20 – 400 mm²/s (cSt) |
| Operating Temperature |
0 °C – +60 °C |
| Control Type |
Pressure-compensated with automatic displacement regulation |
| Shaft Type |
Straight keyed shaft |
| Noise Level |
Below 60 dB(A) at rated pressure |
| Weight |
Approx. 9.5 kg |
3. Product Design and Construction
The VDR-1B-1A1-U-1586K is built using NACHI’s advanced machining processes and precision materials, ensuring smooth operation, high efficiency, and long-term reliability.
| Component |
Material / Feature |
Function |
| Pump Body |
High-strength aluminum alloy (anodized) |
Lightweight, corrosion-resistant, and thermally efficient structure |
| Cam Ring |
Hardened alloy steel |
Provides smooth vane movement and uniform pressure distribution |
| Rotor and Vanes |
Precision-ground tool steel |
Ensures consistent sealing and low friction for quiet operation |
| Shaft |
High-carbon steel, heat-treated |
Designed for long life under high torque loads |
| Pressure Compensator |
Integral with cover plate |
Maintains constant system pressure automatically |
| Bearings |
Dual radial ball bearings |
Provides balanced support for low vibration and extended lifespan |
| Seals |
NBR (standard) or Viton (optional) |
Ensures leak-free operation under varying temperature ranges |
This design approach ensures optimal efficiency, minimal pulsation, and consistent pressure performance throughout the operating range.
4. Performance Characteristics
| Operating Parameter |
Typical Value |
Description |
| Displacement Adjustment Range |
8–25 cm³/rev |
Enables adaptive flow output based on load demand |
| Rated Flow (1800 rpm) |
20–25 L/min |
Sufficient for medium hydraulic systems |
| Pressure Range |
0.5–14 MPa |
Wide operating flexibility for various load conditions |
| Efficiency (Volumetric) |
90–93% |
High efficiency reduces power loss and heat generation |
| Mechanical Efficiency |
88–91% |
Stable output across varying pressures |
| Response Time |
< 100 ms |
Rapid pressure compensation to maintain system stability |
| Sound Level |
≤ 60 dB(A) |
Quiet operation suitable for precision environments |
| Temperature Rise (under load) |
< 15 °C |
Excellent thermal stability during continuous duty |
The combination of these parameters enables smooth control and energy-efficient operation, even in applications requiring precise hydraulic response.
5. Functional Advantages
The NACHI VDR-1B-1A1-U-1586K delivers multiple operational benefits that make it a preferred solution across industries:
-
Energy Efficiency:
Automatically reduces displacement when pressure demand decreases, conserving energy and minimizing oil heating.
-
Stable Pressure Control:
The integrated compensator mechanism ensures consistent output pressure with minimal fluctuation, even under variable loads.
-
Low Noise and Vibration:
Balanced rotor and optimized vane geometry minimize fluid pulsation, ensuring smooth, quiet operation.
-
Compact and Lightweight:
The high-efficiency aluminum body provides superior strength-to-weight ratio, simplifying installation and reducing equipment mass.
-
Long Service Life:
Use of precision-machined components and wear-resistant materials extends operational lifespan under continuous use.
-
Ease of Maintenance:
Modular construction allows fast disassembly for inspection or replacement, reducing downtime and maintenance costs.
-
Thermal Stability:
Efficient oil circulation design minimizes temperature rise, ensuring reliable operation in continuous-duty applications.
6. Application Fields
The VDR-1B-1A1-U-1586K is designed for a wide variety of hydraulic systems requiring both performance and energy efficiency:
| Industry |
Application Examples |
| Machine Tools |
Hydraulic control of tool changers, table feeds, clamping, and cutting heads |
| Injection Molding Machines |
Precision pressure control for clamping, injection, and ejection circuits |
| Press Machines |
Pressure regulation and smooth motion for hydraulic pressing and forming |
| Industrial Robots |
Actuator drive and grip control systems |
| Material Handling Systems |
Conveyor lifts and hydraulic clamps |
| Textile and Printing Machinery |
Low-noise hydraulic systems for continuous operation |
| Hydraulic Test Benches |
Pressure-stable hydraulic sources for testing valves and cylinders |
These applications highlight the pump’s versatility and reliability across a range of industries requiring compact, efficient, and durable hydraulic components.
7. Installation and Operation Guidelines
To ensure optimal performance of the VDR-1B-1A1-U-1586K, the following operating guidelines are recommended:
| Parameter |
Recommendation |
| Mounting Position |
Horizontal installation preferred; ensure shaft alignment |
| Fluid Type |
Use clean mineral hydraulic oil (ISO VG32–68) |
| Filtration Level |
Use a filter rated at 10 µm absolute or finer |
| Oil Temperature |
Maintain between 30 °C – 50 °C for optimal performance |
| Suction Line |
Keep as short as possible; use a large-diameter hose to reduce suction loss |
| Pressure Adjustment |
Use a precision pressure gauge when setting relief values; never exceed 14 MPa |
| Start-Up Procedure |
Prime the pump fully to remove air before first operation |
| Maintenance Schedule |
Inspect seals, bearings, and vanes every 4000–6000 hours or as required by service conditions |
Proper installation and maintenance ensure stable performance, minimal noise, and long service life.
8. Maintenance and Spare Parts
NACHI provides comprehensive service kits for easy maintenance and repair:
| Component |
Service Kit / Part Code |
| Vane Cartridge Assembly |
VDR1B-1586K-CART |
| Seal Kit (Standard NBR) |
VDR1B-SK-NBR |
| Seal Kit (High Temp Viton) |
VDR1B-SK-VIT |
| Pressure Compensator Unit |
VDR1B-PC1586 |
| Bearing Set |
VDR1B-BS |
| Complete Overhaul Kit |
VDR1B-1586K-SET |
Regular maintenance using original NACHI parts preserves hydraulic efficiency and system reliability.
9. Advantages Compared to Conventional Fixed-Displacement Pumps
| Aspect |
VDR-1B-1A1-U-1586K (Variable) |
Fixed-Displacement Pump |
| Energy Consumption |
Adjusts automatically to load; highly efficient |
Constant energy use regardless of demand |
| Pressure Stability |
Maintains constant pressure automatically |
Requires external control valves |
| Noise Level |
Low, under 60 dB(A) |
Generally higher |
| Maintenance |
Modular and easy |
More complex system design |
| System Heat Generation |
Minimal due to reduced energy waste |
Higher due to continuous full-flow operation |
This comparison shows how the NACHI VDR Series, particularly the VDR-1B-1A1-U-1586K, provides superior efficiency and cost-effectiveness in modern hydraulic systems.
10. Summary
The NACHI VDR-1B-1A1-U-1586K is a high-efficiency, low-noise, and durable variable displacement vane pump tailored for precision hydraulic applications. Its pressure-compensated control, compact form factor, and robust construction make it a leading choice for industrial machinery requiring consistent performance and reduced operating costs.
Key Benefits:
-
Automatic displacement control for energy savings
-
Quiet and vibration-free operation
-
Excellent pressure stability and rapid response
-
Long service life with low maintenance requirements
-
Compact design ideal for space-constrained systems
With its advanced engineering, the VDR-1B-1A1-U-1586K stands as a benchmark in NACHI’s hydraulic product lineup, ensuring reliability and performance for modern industry standards.
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