Vickers SQP Series Vane Pump Replacement | SQP432 SQP21 SQP4 | High Pressure Low Noise

The SQP Series high-pressure, low-noise vane pumps from Chengyuan Hydraulic are precision-engineered for industrial applications where a quiet operating environment is critical. These pumps serve as premium replacements for the original Vickers (Eaton) SQP series, available in single (SQP4), double (SQP21), and triple (SQP432) configurations. By utilizing advanced Intra-vane technology, the SQP series significantly reduces pressure pulsations and operational noise. Chengyuan guarantees 100% Drop-in Interchangeability with OEM units regarding mounting flanges, shaft types, and port dimensions. Supported by our 100% Simulation Load Testing, each pump is verified under high-pressure conditions before shipment to ensure top-tier volumetric efficiency and reliability.

Technical Specifications 

• Compatible Brand: Vickers (Eaton)

• Model Code Breakdown:

  • SQP432-60-35-14-86DDC-18: Triple pump (60 USgpm Front, 35 USgpm Middle, 14 USgpm Rear)

  • SQP21-19-2-86CC2-18: Double pump (19 USgpm Front, 2 USgpm Rear)

  • SQP4-50-86D29-18: Single pump (50 USgpm displacement)

• Rated Operating Pressure: Up to 175 Bar (2500 psi) – depends on cartridge size

• Peak Pressure: 210 Bar (3000 psi)

• Rated Speed: 1200 r/min – 1800 r/min

• Maximum Speed: 1800 r/min

• Minimum Speed: 600 r/min

• Control Logic: Fixed Displacement

• Internal Structure: Intra-vane cartridge kit for rapid field servicing

• Seals: NBR (Standard) / FKM (Optional for high-temperature fluids)

Key Technical Advantages:

• Ultra-Quiet Intra-vane Design: The defining feature of the SQP series is the intra-vane structure. The vanes use internal pressure to balance the contact force against the stator, drastically reducing mechanical noise and vibration. Noise levels are typically 5-10 dB(A) lower than standard vane pumps, making them ideal for indoor hydraulic power units (HPUs).

• Modular Cartridge Kit Construction: The internal rotating group is designed as an independent cartridge. This allows for rapid maintenance—technicians can replace the “guts” of the pump without removing the housing from the machinery, significantly reducing downtime.

• Flexible Multi-Pump Configurations: Triple pump models like the SQP432 allow a single drive source to power three independent circuits. Different displacements for each stage enable the perfect balance of high-pressure/low-flow and low-pressure/high-flow, optimizing system energy efficiency.

• Superior Volumetric Efficiency: Utilizing pressure-balanced side plates, the SQP series maintains extremely low internal leakage even at 175 Bar. Chengyuan’s optimized grinding process ensures a precise fit between the vanes and the stator curve, enhancing long-term stability.

Application Areas:

• Machine Tools: Reliable power source for grinders, milling machines, and automated CNC centers.

• Injection Molding: Powering auxiliary circuits or primary hydraulic systems in plastic processing.

• Pressing & Forging: Ideal for small bending machines and presses where environmental noise is a concern.

• Waste Management: Used in refuse compactors and industrial recycling systems.

Expert Maintenance Tips:

• Cartridge Installation: When replacing the cartridge kit, verify the exact position of the locating pins. Incorrect orientation will lead to suction failure or catastrophic stator scoring.

• Inlet Velocity Limits: Due to high flow capacities, the suction line must be adequately sized. Any suction restriction (excessive vacuum) will prevent the intra-vanes from extending correctly, causing high-pitched whining and rapid “wavy” wear on the stator.

• Fluid Cleanliness Standards: We strongly recommend maintaining system fluid at ISO 4406 19/17/14 or better. Vane pumps are highly sensitive to metallic particles; any hard contaminants can score the valve plate surfaces.