Vickers SQP Series Vane Pump | SQP21 SQP31 SQP43 | Low Noise Double Pump

The SQP Series high-pressure intra-vane pumps from Chengyuan Hydraulic are industrial-grade power units fully compatible with Vickers engineering standards. Specifically designed for indoor environments requiring ultra-low operational noise, this series utilizes the specialized Intra-vane design. For double pump configurations such as SQP21-21-11 and SQP43-60-30, we ensure precision flow matching between the shaft-end and cover-end pumps. Every SQP pump undergoes 100% simulated full-load condition testing to verify that volumetric efficiency and noise control at rated pressures (21MPa) match OEM standards, ensuring 100% original-place interchangeability.

Technical Specifications :

• Series Models: Single (SQP1-4) and Double (SQP21, SQP31, SQP32, SQP41, SQP42, SQP43)

• Rated Pressure: 17.5 MPa (175 bar) to 21 MPa (210 bar)

• Displacement (Shaft End): 7 cm³/rev to 193 cm³/rev

• Displacement (Cover End): 7 cm³/rev to 158 cm³/rev

• Maximum Speed: 1800 r/min

• Minimum Speed: 600 r/min

• Shaft Options: 1 (Straight Key), 86 (Heavy Duty), 11 (Spline)

• Port Positions: A, B, C, D (4 rotations of 90° available)

• Cartridge Kits: Supports 12 variable intra-vane cartridge designs for flexible combination

Key Technical Advantages:

• Intra-vane Noise Reduction Technology: The core advantage of the SQP series is the dual-vane structure (a small vane inside a larger one). This design reduces the impact force of the vanes against the stator cam, significantly dampening hydraulic pulsation and mechanical vibration. It lowers noise levels by 10-15 dB compared to standard pumps.

• Quick-Change Cartridge Kit Design: The internal core components are integrated into a cartridge kit. This allows maintenance personnel to restore pump performance by simply replacing the core without removing the pump housing from the machine, drastically reducing downtime for B2B clients.

• Hydraulically Balanced Side Plates: Side plates are designed for automatic pressure compensation, adjusting the clearance against the rotor faces according to output pressure. This minimizes internal leakage and enhances the pump’s tolerance to fluid contaminants.

• Flexible Multi-Pump Combinations: Chengyuan provides dozens of configurations for SQP21, SQP43, and more. Whether for high-low pressure circuits or dual-circuit systems, our SQP series fits perfectly within existing footprints.

Application Areas:

• Plastics Machinery: Power systems for injection molding and blow molding machines.

• Machine Tools: Lubrication and auxiliary systems for CNC lathes and grinders.

• Rubber Machinery: Stable high-pressure oil supply for vulcanizing and rubber cutting machines.

Expert Maintenance Tips:

• Inlet Filtration Integrity: Vane pumps are highly sensitive to cavitation. Ensure the suction filter is clean and that the vacuum does not exceed -0.02MPa; otherwise, the intra-vanes may fail to extend correctly, causing insufficient flow or high-pitched noise.

• Shaft Alignment: Coaxial deviation between the pump shaft and motor shaft should be within 0.1mm. While SQP pumps feature heavy-duty bearings, chronic misalignment causes uneven loading on the cartridge, accelerating stator cam wear.

• Thermal Management: Maintain oil temperature between 30°C and 55°C. Excessive heat hardens seals, and for compact models like the SQP21, proper cooling is essential for a long service life.