Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of Nachi Variable Vane Pump in China. We warmly welcome you to wholesale bulk Nachi Variable Vane Pump for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
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The Nachi Variable Vane Pump series (featuring the renowned VDR, VDC, and PVS models) represents a high-efficiency solution for modern hydraulic systems. Engineered for precision flow and pressure compensation, these positive displacement pumps automatically adjust displacement based on system load demand. Designed for medium-to-high pressure applications requiring strict speed and force regulation, Nachi variable vane pumps eliminate energy waste, suppress system thermal generation, and deliver near-silent operational performance in high-duty hydraulic circuits.
Key Advantages
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- Integrated Pressure Compensation: Maintains consistent pressure while dynamically scaling flow down to near-zero stroke upon reaching set pressure limits, significantly cutting power consumption.
- Acoustic Optimization & Low Noise: Specially designed rotor-vane dynamics and body damping result in whisper-quiet operation across the entire working envelope.
- Rapid Dynamic Response: Engineered swashplate and spring assemblies ensure sharp, transient response times (under 50 ms) during dynamic pressure switching.
- High Volumetric & Mechanical Efficiency: Precision-machined vane track profiles and wear plates minimize internal leakage and operational friction.
- Compact Hydraulic Footprint: Direct-coupled mounting interfaces (SAE and JIS standard) streamline integration into tight machine frames and power units.
Technical Specifications
▔▔| Parameter | VDR-1B Series | VDR-2B Series | VDC-1A Series | VDC-2A Series | Unit |
| Displacement Range | 7.8 - 14.0 | 15.6 - 28.0 | 12.0 - 22.0 | 25.0 - 45.0 | cm3/rev |
| Max Operating Pressure | 7.0 (70) | 7.0 (70) | 14.0 (140) | 14.0 (140) | MPa (bar) |
| Rated Speed Range | 800 - 1800 | 800 - 1800 | 800 - 1800 | 800 - 1800 | RPM |
| Max Flow Rate (at 1500 RPM) | 11.7 - 21.0 | 23.4 - 42.0 | 18.0 - 33.0 | 37.5 - 67.5 | L/min |
| Operating Temperature Range | -10 to +70 | -10 to +70 | -10 to +70 | -10 to +70 | deg C |
| Recommended Viscosity Range | 15 - 400 | 15 - 400 | 15 - 400 | 15 - 400 | mm2/s (cSt) |
| Pressure Hysteresis | Less than 0.3 | Less than 0.3 | Less than 0.4 | Less than 0.4 | MPa |
| Response Time (Cut-off) | 30 - 50 | 35 - 50 | 40 - 60 | 45 - 65 | ms |
| Response Time (Cut-in) | 40 - 60 | 45 - 65 | 50 - 75 | 55 - 80 | ms |
Applications
▔▔- CNC Lathes & Machining Centers: Drives hydraulic chuck clamping cylinders, tool changers, and tailstocks. Provides stable pressure compensation to maintain clamping force without continuous energy consumption or fluid heating.
- Plastic Injection Molding Auxiliary Systems: Controls core-pulling units and ejector pin hydraulic circuits, offering fast cut-off response during high-speed cycle transitions.
- Hydraulic Press & Bending Machines: Supplies holding pressure during sheet metal forming operations. Reduces motor power draw during dwell phases.
- Automotive Assembly Automation: Operates positioning indexing tables and automated part lifters, delivering smooth, low-noise movement in continuous duty factory environments.
Related Models
▔▔| Model Code | Pump Type | Displacement (cm3/rev) | Pressure Adj. Range (MPa) | Mounting Type |
| VDR-1B-1A1-13 | Single Variable Vane | 7.8 | 0.8 - 7.0 | Flange Mount |
| VDR-1B-2A2-13 | Single Variable Vane | 11.6 | 1.5 - 7.0 | Flange Mount |
| VDR-2B-1A3-13 | Single Variable Vane | 15.6 | 3.5 - 7.0 | Flange Mount |
| VDR-2B-2A3-13 | Single Variable Vane | 22.0 | 3.5 - 7.0 | Flange Mount |
| VDC-1A-1A2-20 | Medium Pressure Vane | 12.0 | 2.0 - 14.0 | Flange Mount |
| VDC-1A-2A3-20 | Medium Pressure Vane | 22.0 | 3.5 - 14.0 | Flange Mount |
| VDC-2A-1A3-20 | Medium Pressure Vane | 28.0 | 3.5 - 14.0 | Flange Mount |
| VDC-2A-2A5-20 | Medium Pressure Vane | 45.0 | 7.0 - 14.0 | Flange Mount |
FAQ
▔▔Q1: How do I decipher the complete Nachi pump part number to verify specification details?
A: The model code indicates pump series, frame size, displacement designation, pressure adjustment range, design number, and shaft end specification (e.g., VDR-1B-1A2-13). Please send your complete model code to our engineering team for exact cross-reference.
Q2: What is the recommended fluid filtration level for Nachi variable vane pumps?
A: To ensure long service life and prevent valve spool sticking, maintain oil contamination levels within ISO 4406 Class 19/16/13 (or NAS Class 10). We strongly recommend installing a 10-micron filter on the return line and a 150-mesh suction strainer.
Q3: Which types of hydraulic fluid can be used with these pumps?
A: Standard units are compatible with mineral-based hydraulic oils (ISO VG32, VG46, VG68). If using water-glycol, phosphate ester, or synthetic fluids, specialized seals (FKM) and modified internal clearances are required.
Q4: What should be checked before initial start-up?
A: Always fill the pump housing completely with clean hydraulic oil through the drain port prior to turning the motor. Ensure the pump shaft rotation matches the directional arrow on the casing, and start the motor under zero-pressure unloader status.
Contact Us
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Request a Quote Today to ensure your hydraulic system performs at its best with genuine components from Yanhui Hydraulic.
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