VP5F-A4-50 Variable Vane Pump | 70 Bar OEM Replacement

Product Overview:

Engineered for light- to medium-duty industrial hydraulic systems requiring precise flow and pressure management, the VP5F-A4-50 variable displacement vane pump (representing the larger VP5, VP6, and VP7 flange-mounted series) is built around an advanced pressure-compensating mechanism. This design automatically adjusts flow output in response to system load demands, virtually eliminating relief valve heating and significantly reducing energy consumption. Every unit undergoes rigorous 100% full-load simulated testing for pressure stability, flow response, and thermal performance prior to dispatch. Machined to strict industry standards for pilot diameters, mounting flanges, and porting, this pump delivers flawless drop-in interchangeability with major Asian industrial brands (such as CML, KCL, and Yuken). It is the premier choice for cost-effective maintenance and energy-efficient upgrades on machine tools and automated machinery.

Technical Specifications

• Model Code: VP5F-A4-50 (Compatible with VP5, VP6, VP7 series and S-type variants)

• Pump Frame Size: VP5 (Series spans VP5, VP6, and VP7 displacement categories)

• Rated Flow: Approximately 50 L/min (at standard 1800 RPM)

• Pressure Adjustment Range: 5.5 MPa – 7.0 MPa (Code A4: 55-70 kgf/cm²; A2, A3, and A5 ranges also available)

• Max Peak Pressure: 7.0 MPa (70 bar)

• Speed Range: 800 – 1800 RPM

• Control Type: Mechanical pressure compensation (features independent pressure and maximum flow adjustment screws)

• Mounting Type: Flange mount (Code F)

• Drive Shaft: Standard straight cylindrical shaft with parallel key

• Direction of Rotation: Clockwise (viewed from the shaft end)

• Recommended Oil Viscosity: 15 – 68 cSt (Optimal working temperature: 30°C – 50°C)

Key Technical Advantages:

• Energy-Efficient Variable Mechanism: Equipped with a highly responsive pressure feedback compensator. Once the preset pressure is reached, the pump automatically de-strokes to near-zero flow to maintain pressure, eliminating high-pressure bypass losses and improving overall efficiency by over 30% compared to fixed-displacement pumps.

• True Drop-In Interchangeability: Engineered to match standard industrial specifications perfectly. The mounting pilot, flange bolt patterns, and port threads allow for direct, plug-and-play replacement of existing pumps without modifying brackets or hydraulic piping.

• Optimized Low-Noise Operation: Features a robust cast-iron housing and precision-machined port plates that smooth out pressure transitions. This effectively dampens hydraulic shock, ensuring exceptionally quiet operation even under full 70 bar loads.

• 100% Rigorous Factory Testing: Moving beyond random sampling, every single pump is subjected to automated test bench procedures evaluating maximum holding pressure, transient flow response, and thermal stability to guarantee zero-defect field performance.

Application Areas:

• CNC Machine Tools: Hydraulic power units for clamping, chucking, and tool-feeding circuits in lathes, milling machines, and grinders.

• Light Industrial & Footwear Machinery: Main power sources for shoe-making machines, die-cutting presses, and compact vulcanizing equipment.

• Woodworking & Packaging: Automated edge banders, cold presses, and packaging automation hydraulic systems.

• Custom Automation Lines: Auxiliary low-pressure control circuits and multi-station transfer machines.

Expert Maintenance Tips:

• Essential Pre-Startup Priming: Due to internal clearances, variable vane pumps require manual priming before initial startup. Always remove the highest case drain plug and fill the pump housing completely with clean hydraulic fluid. Dry running is strictly prohibited.

• Case Drain Line Configuration: The external case drain line must be routed directly to the reservoir independently of return lines to ensure zero back-pressure. The drain tube outlet must terminate below the fluid level to prevent air ingestion and protect the main shaft seal from rupturing.

• Proper Adjustment Procedures: During commissioning, loosen the pressure adjustment screw to allow the pump to start and bleed air at minimal pressure. Gradually dial in the required pressure. Never force the A4 pressure spring beyond the rated 70 bar limit, as this can cause spring binding and rotor failure.