VOP-203 VOP-204 VOP-212 Series Variable Displacement Vane Pump | Pressure Compensated | 70 Bar

The VOP Series by Chengyuan Hydraulic is a high-performance, pressure-compensated variable displacement vane pump designed for precision and energy efficiency in hydraulic circuits. Covering a wide range of models from VOP-203 to VOP-220, this series is the ideal power source for machine tools and light industrial automation. The core advantage lies in its ability to automatically adjust flow output based on system demand—reducing energy waste and heat generation. We guarantee 100% original-place interchangeability and subject every unit to 100% simulated condition testing to ensure flawless responsiveness and long-term stability under continuous 70-bar loads.

Technical Specifications 

• Available Models: VOP-203, 204, 206, 208, 210, 212, 215, 220

• Flow Rates (@ 1800 rpm):

  • VOP-203: $8.0\text{ L/min}$

  • VOP-204: $12.0\text{ L/min}$

  • VOP-208: $22.2\text{ L/min}$

  • VOP-212: $33.3\text{ L/min}$

  • VOP-220: $44.4\text{ L/min}$

• Max Operating Pressure: $7.0\text{ MPa (70 bar / 1015 psi)}$

• Pressure Adjustment Range: $0.8\text{–}7.0\text{ MPa}$

• Speed Range: $800\text{–}1800\text{ rpm}$

• Shaft Type: Parallel Keyed

• Mounting Type: Flange (F) or Foot Mounting (L)

• Efficiency: Volumetric Efficiency $\ge 90\%$

Key Technical Advantages

• High-Dynamic Pressure Compensation: Equipped with a precision internal feedback spring and spool. When actuators are inactive, the pump stroke automatically moves toward zero eccentricity, reducing power consumption to only $15\%\text{–}20\%$ of full load, greatly improving energy efficiency.

• Advanced Alloy Steel Vanes: Vanes are manufactured from high-wear alloy steel with vacuum heat treatment and ultra-fine grinding. Combined with optimized cam ring profiles, this ensures exceptional service life and consistent volumetric efficiency even under high-frequency pressure cycles.

• Low-Noise Acoustic Engineering: The housing is cast from high-tensile FC250 iron with CFD-optimized internal passages to eliminate oil-trapping ripples. Noise levels are kept within $60\text{–}65\text{ dB}$ under full pressure, significantly quieter than fixed displacement alternatives.

• 100% Full-Condition Factory Testing: Before shipment, every VOP pump undergoes rigorous pressure surge testing at our facility. We verify the accuracy of the compensation thresholds to eliminate “pressure drift” issues in the field.

Application Areas

• CNC Machine Tools: Power for tool changers, clamping systems, and auxiliary circuits.

• Woodworking Machinery: Reliable power source for edge-banders and routers.

• Automated Production Lines: Lightweight transport, lifting, and steady pressure-holding tasks.

Expert Maintenance Tips

• Independent Drain Line: Variable vane pumps require a dedicated case drain line returned directly to the tank. Ensure the line is large enough to keep case backpressure below $0.03\text{ MPa}$ to protect the shaft seal.

• Pre-Lubrication: Before initial startup, fill the pump housing with clean hydraulic oil through the drain port. This prevents dry friction damage to the vanes during the few seconds before suction is established.

• Temperature Control: These pumps are sensitive to thermal changes. Maintain oil temperature between $15\text{–}60\text{°C}$. Excessive heat can slow down the compensation mechanism, affecting regulation accuracy.