Vickers SQP Series Vane Pump | SQP1 SQP21 SQP32 | High Pressure Low Noise Pump

The Vickers SQP Series premium electro-hydraulic intra-vane pumps manufactured by Chengyuan Hydraulic are high-efficiency, ultra-low-noise fluid power components engineered to thoroughly match the rigorous design specifications of Vickers (now Danfoss Power Solutions / Eaton division). This heavy-duty aftermarket alternative matrix systematically encompasses critical single-displacement and multi-stage double-pump configurations found across global automated machine setups, including single pump SQP1-11-1D-LH-15, high-pressure double pumps SQP21-14-8-1CC-18, SQP21-14-11-1DD-18, and the high-output double platform SQP32-35-21-1DD-18.

Operating as the reliable primary energy heart within precision CNC machining centers, shoe manufacturing machines, massive automotive die-casting systems, and industrial metal shears, a vane pump’s sonic emission output and flow ripple directly dictate factory workspace compliance and circuit indexing reliability. The SQP lineage is globally recognized for its signature Intra-vane Design profile and pulse-dampening housing architecture. Chengyuan guarantees 100% original-place drop-in interchangeability across all units regarding standard SAE mounting flange pilots (SAE-A, B, or C configurations), parallel/splined shaft sizing, multi-stage cartridge group displacement sizing, and multi-port flange alignment setups. Every single pump assembly undergoes 100% full-capacity simulated pressure and speed tracking tests on advanced digital test beds prior to shipment, maintaining high volumetric outputs and low acoustics up to 20.7 MPa.

Technical Specifications 

• Compatible Brand: Vickers by Danfoss / Eaton (Industrial Intra-Vane Low Noise Standard)

• Target Replacement Model Codes: SQP1-11-1D-LH-15, SQP21-14-8-1CC-18, SQP21-14-11-1DD-18, SQP32-35-21-1DD-18

• Geometric Displacement Rating per Cartridge Configuration ($cm^3/rev$):

  • SQP1 Configuration (Size 11): 35.1 $cm^3/rev$

  • SQP21 Configuration (Shaft End Size 14 / Rear End Size 8): Front 45.4 $cm^3/rev$ / Rear 27.2 $cm^3/rev$

  • SQP21 Configuration (Shaft End Size 14 / Rear End Size 11): Front 45.4 $cm^3/rev$ / Rear 35.1 $cm^3/rev$

  • SQP32 Configuration (Shaft End Size 35 / Rear End Size 21): Front 109.4 $cm^3/rev$ / Rear 67.5 $cm^3/rev$

• Maximum Continuous Operating Pressure:

  • SQP1 / SQP2 Cartridge Components: 20.7 MPa (207 bar / 3000 psi)

  • SQP3 Cartridge Components: 17.2 MPa (172 bar / 2500 psi)

• Maximum Allowable Operational Speed: 1,800 rpm at peak rated loading limits

• Minimum Required Drive Speed: 600 rpm (mandatory to ensure adequate centrifugal force flings the vanes to seal against the cam ring track)

• Rotation and Porting Alignment Coding Matrix:

  • LH Indicator: Counter-Clockwise rotation viewed from the input shaft end, with “1D” indicating a standard 90° split-flange entry/exit angle layout

  • 1CC / 1DD Indicator: Clockwise rotation viewed from the shaft end. “CC” specifies that both dual discharge ports align on the same side relative to the master suction port; “DD” places the discharge ports in directly opposed geometric quadrants

• Total Assembly Structural Weight: Single SQP1 approx. 13.5 kgs (29.7 lbs); Dual SQP32 approx. 53.2 kgs (117 lbs)

Key Technical Advantages:

• Advanced Twelve-Vane Intra-Vane Self-Balancing Profile: The internal cartridge incorporates a vane-within-a-vane layout where high-pressure system fluid is continuously channeled to the base cavities between the primary and insert vanes. This creates a micron-level hydraulic pressure-balance oil barrier between the vane tips and the cam ring track, minimizing mechanical shear wear and maintaining high volumetric efficiency over 96% under prolonged peak loading states.

• Acoustically Tuned Dual-Discharge Cam Ring Contours: The internal cam ring tracks are finished using five-axis grinding geometries to smooth fluid acceleration between the suction and discharge zones. Combined with specialized triangular noise-suppression metering notches cut into the side plates, this configuration smooths fluid discharge delivery, keeping operational noise levels between 60-65 dB(A) at 1,500 rpm for indoor work environments.

• Modular Fast-Change Replacement Cartridge Kit Design: The SQP design utilizes entirely self-contained modular cartridge kit components. For the double-pump variants like the SQP21 and SQP32, both the front and rear pumping cells function as independent cartridges. If severe contamination causes localized wear, technicians can replace the standard internal cartridge kit in under 20 minutes without breaking the primary piping connections, reducing maintenance downtime.

• Bi-Metallic Anti-Scoring Heavy-Load Wafer Side Plates: The lateral flex side wear plates feature a ductile iron core clad with a 0.6mm layer of vacuum-fused high-lead-bronze bearing material. This metallic composition resists adhesive wear and scoring if the system suffers temporary localized fluid temperature spikes or brief boundary lubrication deficits, protecting the main rotating assembly.

Application Areas:

• High-Precision CNC Machine Tools & Factory Automation: Providing quiet fluid power to main vertical CNC lathe lines, automated indexing tool turrets, and low-noise clamping workstations.

• Heavy-Duty Industrial Shoemaking & Die Cutting Systems: Powering high-low tandem manifold circuits on clicker presses and multi-stage thermoforming presses requiring rapid approach speeds and sustained low-flow pressure holding.

• High-Tonnage Plastic Injection & Die-Casting Circuits: Serving as low-noise auxiliary servo support pumps or primary clamping supply components on compression moulding presses and factory recycling balers.

Expert Maintenance Tips:

• Mandatory Pre-Lubrication Prior to Electrical Commissioning: Running the pump dry will compromise the longevity of the SQP intra-vane components. Once the new pump is secured and piped, you must pre-fill the assembly with clean hydraulic fluid through the top discharge port and rotate the input coupling manually several times to wet all internal components. Utilize an intermittent jogging approach during the initial electrical startup to prevent dry friction wear between the vanes and the cam ring.

• Absolute Air-Tight Sealing Controls Along the Inlet Line: Vane pumping configurations are highly sensitive to microscopic air ingestion. Ensure all suction flange gaskets are fully compressed and maintain suction velocities under 1.0 m/s to prevent negative-pressure aeration. If air leaks past the entry seals or if the fluid level drops below the inlet pipe, the pump will produce a harsh, irregular metallic grinding noise, indicating cavitation erosion that can strip the cam ring track.

• Verify Shaft Rotation Identifiers to Avoid Catastrophic Rupture: The directional codes embedded within the suffix (such as LH for counter-clockwise or its absence for standard clockwise orientation) along with port configurations like 1CC or 1DD are critical physical parameters. Verify the prime mover’s electrical wiring rotation prior to coupling the shaft. Running the pump backward prevents suction priming and will rupture the low-pressure shaft seals and bronze guide plates within seconds.