NACHI PVS Series Variable Vane Pump | PVS-16-22 | PVS-25-22 | PVS-40-22

LIC Hydraulic’s NACHI PVS Series axial variable displacement vane pumps are the premier solution for energy-saving and quiet-operation hydraulic systems. This series spans the entire range from PVS-08 to PVS-50, including high-performance models such as PVS-16AZ-140C2 and PVS-25AZ-140. We offer 100% Drop-in Interchangeable products that meet or exceed OEM standards. Featuring the innovative semi-cylindrical swash plate mechanism, the PVS series delivers exceptional pressure response and volumetric efficiency across all pressure ranges. Every pump is subjected to 100% load-simulated performance testing to ensure zero-defect reliability in machine tool and industrial automation applications.

Technical Specifications (Bulleted List)

• Series Model: PVS Series (Variable Displacement Vane Pump)

• Displacement Range: 8.0 cm³/rev (PVS-08) up to 50.0 cm³/rev (PVS-50)

• Rated Pressure: 14 MPa (140 bar / 2030 PSI)

• Max Pressure: 17.5 MPa (175 bar / 2538 PSI)

• Max Rotation Speed: 1800 RPM

• Min Rotation Speed: 600 RPM

• Control Types: Pressure Compensator (A, E, H series) with adjustable flow/pressure curves.

• Code Identification (Example PVS-16AZ-140C2): 16 (Size), A (Pressure Compensated), Z (Type), 140 (14MPa Pressure), C2 (Regulation Range).

Key Technical Advantages

• Semi-Cylindrical Swash Plate Design: NACHI’s proprietary design reduces friction during swash plate pivoting. This results in ultra-fast compensation response and a significantly lower decibel profile compared to standard vane pumps.

• High Volumetric Efficiency: Precision-honed vanes and stators minimize internal bypass. This ensures the pump maintains efficiency levels above 95% at rated pressures, directly contributing to machine energy savings.

• Compact Footprint: The integrated design allows for a smaller hydraulic manifold and footprint, making it the perfect choice for space-constrained CNC machine interiors and compact power units.

• Advanced Surface Hardening: Critical internal rotating groups undergo special thermal treatments to resist wear and cavitation, ensuring stable performance during high-frequency cycles.

Application Areas

• Precision Machining: Primary hydraulic source for CNC centers, grinding machines, and lathes.

• Molding Machinery: Core-pulling and pilot control for injection molding and rubber presses.

• General Industry: Industrial compactors, automated assembly lines, and material handling systems.

Expert Maintenance Tips

• Temperature Management: Maintain hydraulic fluid temperature between 10°C – 60°C. High temperatures above 65°C will degrade seals and reduce oil viscosity prematurely.

• Inlet Vacuum Monitoring: Ensure the inlet pressure remains within the -0.03 MPa to +0.03 MPa range. A clogged suction filter will cause immediate cavitation, “whining” noise, and internal erosion.

• Priming Protocol: Never start the pump dry. Fill the pump case with clean hydraulic oil through the drain port and rotate the shaft manually several times to establish an oil film before applying power.

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