Vickers VQ Series Vane Pump | 4535VQ60A3819CC20LH | 4525VQ 4520VQ | High Pressure Double Pump

The VQ Series high-pressure double vane pumps from Chengyuan Hydraulic are high-performance power units specifically engineered for mobile equipment, fully compatible with Vickers industry standards. The VQ series features the core Intra-vane technology, which significantly enhances wear resistance under high pressure by reducing the contact stress between the vanes and the cam ring. For key models such as 4535VQ60A38 and 4525VQ50A11, we utilize reinforced ductile iron housings and high-hardness alloy cam rings. Every pump undergoes 100% simulated full-load condition testing before delivery to ensure that volumetric efficiency and low-noise performance meet OEM standards, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: VQ Series (High-Pressure Double Vane Pump)

• Example Models: 4535VQ60A38-19CC20LH / 4525VQ50A11-41AA20

• Displacement Combination (Pump 1 / Pump 2): 138-193 cm³/rev (4535VQ) / 138-121 cm³/rev (4525VQ)

• Rated Operating Pressure: 21 MPa (210 bar)

• Maximum Rated Speed: 2200 rpm – 2700 rpm (depending on cartridge size)

• Shaft Options: 1 (Straight Keyed) / 11 (Splined) / 86 (Heavy-Duty)

• Mounting Flange: SAE C Standard / SAE B Standard

• Inlet/Outlet Porting: SAE 4-Bolt Flange

• Control Mode: Fixed Displacement

• Rotation: L (Left Hand/CCW) / No Suffix (Right Hand/CW)

Key Technical Advantages:

• Intra-vane Technology: By incorporating a small “intra-vane” within the main vane, the contact force against the cam ring is controlled by system pressure. This ensures a superior seal (minimizing internal leakage) while reducing friction and wear on the cam ring, extending service life by over 50% compared to conventional designs.

• Modular Cartridge Design: The defining feature of the VQ series is its field-replaceable cartridge. This allows for rapid maintenance without removing the pump housing from the machine or disconnecting hydraulic lines, drastically reducing downtime and labor costs.

• High Volumetric Efficiency: The cam ring profile is precision-ground and paired with pressure-compensated side plates. This ensures that even at a full load of 21MPa, volumetric efficiency remains above 94%, reducing system heat generation and energy waste.

• Enhanced Shock & Vibration Resistance: The pump housing is cast from high-strength ductile iron. This rigid structure absorbs the intense vibrations typically found in heavy-duty mobile applications, maintaining the alignment of internal precision components.

Application Areas:

• Mobile Machinery: Main or auxiliary pumps for wheel loaders, motor graders, and rollers.

• Lifting Equipment: Hydraulic circuits for winches and steering in truck cranes and port cranes.

• Mining Machinery: Steering and hoist systems for large-scale mining dump trucks.

Expert Maintenance Tips:

• Oil Viscosity Management: VQ pumps are sensitive to fluid viscosity. It is recommended to maintain an operating viscosity between 13-54 cSt. Thin oil can accelerate wear on the intra-vane mechanism.

• Pre-Startup Priming: Cartridge-style pumps are susceptible to damage if started dry. Always fill the pump with clean hydraulic oil through the outlet or bleeder port before the initial startup and use a “jog-start” method.

• System Cleanliness Standards: To protect the precision-ground cam ring surfaces, the system must include return-line filtration of at least 10μm, ensuring the fluid complies with ISO 4406 18/16/13 standards.