NACHI Vane Pump VDR-1B-1A1-U-1133K — Detailed Product Introduction
The NACHI VDR-1B-1A1-U-1133K is a high-performance variable displacement vane pump engineered for precision hydraulic systems requiring reliable pressure control, energy efficiency, and quiet operation. Designed by NACHI-FUJIKOSHI Corporation, a world leader in hydraulic technology, this pump exemplifies advanced Japanese engineering—offering excellent durability, compact design, and consistent performance in demanding industrial applications.
1. Product Overview
The VDR-1B-1A1-U-1133K belongs to NACHI’s VDR Series, a range of pressure-compensated variable displacement vane pumps designed to provide optimum efficiency and precise flow control under varying load conditions. These pumps automatically adjust the displacement according to system requirements, significantly reducing energy consumption and heat generation compared to fixed-displacement models.
This particular model (VDR-1B-1A1-U-1133K) is characterized by its 1B frame size, single pump configuration, and adjustable pressure compensator. It is widely used in machine tools, injection molding machines, presses, and other precision hydraulic systems where stability, noise reduction, and compactness are essential.
2. Key Features
| Feature |
Description |
| Model Number |
VDR-1B-1A1-U-1133K |
| Pump Type |
Variable displacement vane pump |
| Series |
VDR Series (pressure-compensated) |
| Displacement Type |
Variable (automatic adjustment by pressure control) |
| Mounting Type |
Flange mount (standard ISO configuration) |
| Control Method |
Pressure-compensated control with load sensing |
| Direction of Rotation |
Clockwise (viewed from shaft end) |
| Flow Rate |
Adjustable according to pressure; nominally 8–25 L/min depending on speed |
| Maximum Pressure |
14 MPa (2030 psi) |
| Rated Pressure |
12 MPa (1740 psi) |
| Speed Range |
600–1800 rpm (recommended operation range) |
| Shaft Type |
Straight keyed shaft |
| Suction Pressure |
0.03 MPa absolute minimum |
| Discharge Pressure |
Up to 14 MPa |
| Temperature Range |
0 °C to +60 °C (standard hydraulic oil) |
| Oil Viscosity Range |
20–400 mm²/s (cSt) |
| Applicable Oil Type |
Mineral hydraulic oil (ISO VG32–68) |
| Weight |
Approx. 9.5 kg |
3. Product Structure and Design Highlights
The NACHI VDR-1B-1A1-U-1133K integrates several engineering innovations that contribute to its exceptional performance and long service life:
| Component / Feature |
Function / Benefit |
| Cam Ring and Vane Mechanism |
Provides variable displacement control with smooth operation and low vibration. |
| Pressure Compensator Assembly |
Automatically adjusts displacement to maintain constant pressure, optimizing energy usage. |
| Balanced Rotor Design |
Reduces radial load and bearing stress, minimizing wear and extending operational life. |
| Noise Reduction Chamber |
Advanced internal design reduces fluid pulsation and mechanical noise, achieving <60 dB(A) operation. |
| High-Strength Aluminum Housing |
Lightweight yet rigid construction improves heat dissipation and structural durability. |
| Precision Ground Surfaces |
Ensures stable sealing and high volumetric efficiency, even at low pressures. |
| Compact Body Design |
Small footprint enables easy installation in confined hydraulic circuits. |
4. Performance Characteristics
The VDR-1B-1A1-U-1133K pump offers an excellent combination of efficiency, pressure stability, and quiet performance, making it ideal for continuous-duty operations in precision systems.
| Operating Parameter |
Typical Value |
Remarks |
| Nominal Displacement |
8–25 cm³/rev |
Adjustable by pressure setting |
| Rated Pressure |
12 MPa |
Continuous operation rating |
| Maximum Pressure |
14 MPa |
Short-term peak |
| Rated Flow (at 1800 rpm) |
20–25 L/min |
Depends on displacement setting |
| Input Power (at 12 MPa) |
Approx. 5.5–6.5 kW |
Varies with speed |
| Noise Level (1 m distance) |
<60 dB(A) |
At rated pressure and speed |
| Efficiency |
Volumetric: 90–93%; Mechanical: 88–91% |
Typical values |
| Temperature Rise |
<15 °C above ambient |
Stable under rated load |
| Response Time |
<100 ms |
Fast response to load changes |
These characteristics demonstrate the pump’s suitability for precise control applications that demand both reliability and efficiency.
5. Advantages and Benefits
The VDR-1B-1A1-U-1133K vane pump delivers several operational advantages over conventional hydraulic pumps:
-
Energy Efficiency:
The pressure-compensated variable displacement design ensures that only the necessary flow is supplied, minimizing energy loss and reducing motor load.
-
Low Noise Operation:
Engineered with balanced rotor geometry and optimized vane profile, it offers exceptionally quiet performance, ideal for environments with strict noise regulations.
-
Compact and Lightweight:
The integrated construction minimizes footprint and weight, allowing easy installation in machinery with limited space.
-
Superior Pressure Control:
The compensator provides consistent pressure output, even during rapid load fluctuations, maintaining smooth hydraulic performance.
-
Long Service Life:
Precision-machined components and high-quality materials ensure excellent durability and reduced maintenance frequency.
-
Easy Maintenance:
Modular design allows for convenient disassembly and inspection, reducing downtime during service.
-
Stable Operation:
The smooth flow characteristics eliminate pulsation and vibration, protecting downstream components.
6. Application Fields
The NACHI VDR-1B-1A1-U-1133K pump is suitable for a broad range of industrial and mobile hydraulic systems, particularly where precise pressure control and low noise are critical. Typical applications include:
| Industry / Application |
Typical Use |
| Machine Tools |
Hydraulic actuation, tool clamping, and spindle feed systems |
| Injection Molding Machines |
Pressure and flow control for mold clamping and injection units |
| Press Machines |
Hydraulic press operation with controlled pressure compensation |
| Die Casting Equipment |
Mold opening and closing circuits |
| Industrial Automation |
Actuators, cylinders, and robotic arm control systems |
| Textile and Paper Machinery |
Continuous operation requiring quiet, energy-efficient hydraulics |
| Testing and Laboratory Systems |
Precision pressure regulation for hydraulic test benches |
7. Operating and Installation Guidelines
To ensure optimal performance and service life, the following guidelines should be observed when installing and operating the VDR-1B-1A1-U-1133K:
| Parameter |
Recommendation |
| Mounting Orientation |
Horizontal installation preferred; shaft alignment critical |
| Start-Up Procedure |
Prime the pump with hydraulic fluid before initial operation |
| Operating Fluid |
Clean mineral hydraulic oil (ISO VG32–68) |
| Filtration Level |
≤ 25 µm (recommended 10 µm absolute) |
| Reservoir Size |
Minimum 3× pump discharge per minute |
| Pressure Adjustment |
Use a calibrated gauge; do not exceed 14 MPa |
| Temperature Control |
Maintain oil temperature between 30–50 °C |
| Maintenance Interval |
Check vane wear and replace seals every 4000–6000 hours under normal duty |
Proper adherence to these recommendations ensures stable performance and reduces the likelihood of system failures.
8. Interchangeability and Options
The VDR-1B-1A1-U-1133K is designed with compatibility and flexibility in mind:
| Option Type |
Availability / Description |
| Mounting Interface |
Compatible with standard NACHI flange and coupling sizes |
| Control Type |
Standard pressure-compensated; optional remote-control type available |
| Shaft Variants |
Straight keyed (standard), spline shaft (optional) |
| Seal Material |
NBR (standard), FKM (optional for high-temperature use) |
| Direction of Rotation |
Clockwise standard; counterclockwise available on request |
| Motor Coupling Compatibility |
Complies with IEC and JIS motor flange standards |
9. Maintenance and Spare Parts
NACHI provides dedicated service kits for easy maintenance and part replacement:
| Component |
Service Kit Code |
| Vane Cartridge Kit |
VDR1B-1133K-CART |
| Seal Kit (NBR) |
VDR1B-SK-NBR |
| Seal Kit (Viton) |
VDR1B-SK-VIT |
| Bearing Set |
VDR1B-BS |
| Pressure Compensator Assembly |
VDR1B-PC1133 |
| Complete Overhaul Kit |
VDR1B-1133K-SET |
Routine maintenance using genuine NACHI parts ensures consistent hydraulic performance and prevents premature wear.
10. Summary
The NACHI VDR-1B-1A1-U-1133K variable displacement vane pump is a high-efficiency, compact, and durable hydraulic component designed to meet the needs of modern industrial systems. Its pressure-compensated control, low-noise operation, and energy-saving features make it an excellent choice for precision applications.
By integrating advanced NACHI engineering with robust materials and intelligent flow control, the VDR-1B-1A1-U-1133K ensures:
-
Stable pressure output under fluctuating loads
-
Reduced energy consumption
-
Extended operational life
-
Quiet and vibration-free performance
This model stands as a benchmark for high-performance hydraulic vane pumps, providing industries with reliability, efficiency, and precise control—hallmarks of NACHI’s global reputation for excellence.
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