SQP4 SQP42 SQP43 Series Vane Pump | Tokimec Vickers Replacement | Low Noise Hydraulic Pump

The SQP Series by Chengyuan Hydraulic is a premium line of low-noise, high-pressure intra-vane pumps engineered for demanding industrial hydraulic systems. Covering single (SQP4) and double/triple configurations (SQP42, SQP43), these pumps are designed as high-performance replacements for Tokimec and Vickers standards. At Chengyuan, we emphasize technical authenticity, ensuring 100% original-place interchangeability. Every unit undergoes 100% simulated condition testing to guarantee peak volumetric efficiency and whisper-quiet operation, making them the preferred choice for injection molding, die-casting, and precision machine tools.

Technical Specifications (Bulleted List)

• Example Models: SQP4-50-86D-18, SQP42-42-21-86DC-18, SQP43-60-30-86AA-18

• Displacement (Shaft End): $121$ to $193\text{ cm}^3\text{/rev}$ (Size 4 series)

• Rated Pressure: $17.5\text{ MPa (2538 psi)}$

• Maximum Pressure: $21\text{ MPa (3045 psi)}$

• Speed Range: $600$ to $1800\text{ RPM}$

• Mounting: SAE Standard Flange

• Shaft Configurations: Straight Keyed or Splined (per 86D/86C codes)

• Operating Media: Petroleum-based or fire-resistant fluids

• Noise Level: $65\text{–}72\text{ dB(A)}$

Key Technical Advantages

• Ultra-Low Noise Profile: The SQP series utilizes a pin-vane structure combined with a double-pulsation-absorption porting design. This significantly reduces mechanical vibration and pressure ripples, ensuring silent operation even at full load.

• Cartridge Kit Design: The internal components are housed in an independent cartridge. This modular approach allows for micron-level precision during manufacturing and simplifies on-site maintenance, allowing for quick repairs without disconnecting the main piping.

• Dual Pressure Balancing: The design achieves complete axial and radial pressure balance within the cartridge. This minimizes bearing loads and internal heat generation, significantly extending the service life of bearings and seals.

• High Volumetric Efficiency: Through precision grinding of the vane tips and the cam ring profile, our SQP pumps maintain a volumetric efficiency of over $92\%$ at $17.5\text{ MPa}$, ensuring consistent and linear flow output.

Application Areas

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

• Heavy Duty Machine Tools: CNC press brakes, shearing machines, and hydraulic presses.

• Die-Casting Equipment: Auxiliary and main circuits for aluminum and magnesium die-casting machines.

Expert Maintenance Tips

• Inlet Vacuum Monitoring: Vane pumps are highly sensitive to cavitation. Ensure the inlet pressure does not drop below $-0.02\text{ MPa}$ and regularly clean suction filters to prevent air ingestion.

• Pre-Start Priming: Always fill the pump with clean hydraulic oil through the outlet port before the initial start. Use the “inching” method to allow the pump to prime properly before applying full load.

• Viscosity Optimization: To maintain low noise characteristics, it is recommended to keep the hydraulic oil viscosity between $32$ and $54\text{ cSt}$ at operating temperature.