Vickers SQP SQP1 Series Vane Pump | SQP321 SQP2 SQP21 | High Pressure Low Noise

Chengyuan Hydraulic offers high-performance SQP and SQP1 Series fixed displacement intra-vane pumps, meticulously developed as premium replacements for Vickers (formerly Tokimec) industrial and mobile hydraulic power standards. This versatile product family encompasses single pumps (SQP1, SQP2), double pumps (SQP21), and triple pumps (SQP321-21-21-5VQ), fully accommodating highly explicit engineering codes like SQP21-10-7-86CD-18.

Renowned globally for their ultra-low noise operation, SQP pumps serve as the absolute heartbeat of industrial injection molding machines, die-casting equipment, and hydraulic shears. Chengyuan guarantees 100% Drop-in Interchangeability across all mounting flanges, shafts (SAE splined or keyed), and porting configurations compared to original Vickers units. Backed by our rigorous 100% Simulation Load Testing, each pump is fully validated for volumetric efficiency and decibel limits under full system pressure to ensure reliable aftermarket success.

Technical Specifications 

• Product Series & Configurations: SQP Single Series (SQP2), SQP21 Double Series (e.g., SQP21-11, SQP21-10), SQP321 Triple Series

• Displacement Codes & Geometric Flow:

  • Size 2 Frame (e.g., SQP2-10/12): Code 10 (32.5 $cm^3$/rev), Code 12 (39.0 $cm^3$/rev)

  • Size 21 Double Frame (e.g., SQP21-10-7): Front pump Code 10 (32.5 $cm^3$/rev), Rear pump Code 7 (22.8 $cm^3$/rev)

  • Size 321 Triple Frame (SQP321-21-21-5): First stage Code 21 (67.5 $cm^3$/rev), Second stage Code 21 (67.5 $cm^3$/rev), Third stage Code 5 (17.2 $cm^3$/rev)

• Max Operating Pressure: 172 bar to 207 bar (depending on displacement size; smaller cartridges allow higher pressure ratings)

• Rated & Max Operating Speed: Rated at 1500 rpm; maximum allowable speed up to 1800 rpm

• Minimum Operating Speed: 600 rpm (required to generate sufficient centrifugal force to extend the vanes)

• Shaft Variations: Standard S178 (SAE Straight Keyed) or 86DCD/86CD (SAE Splined)

• Drive Mode: Fixed displacement hydraulic fluid delivery

• Weight: SQP2 (approx. 16.5 kg), SQP21 (approx. 26.0 kg), SQP321 Triple (approx. 45.0 kg)

Key Technical Advantages:

• Vane-in-Vane Pulse Suppression: Utilizing a specialized dual-vane (vane-in-vane) architecture reduces tracking stresses on the internal cam ring contour. This significantly dampens pressure ripples within the discharge chamber, yielding an ultra-quiet output that lowers ambient sound levels by 8-10 dB(A) compared to traditional vane pumps.

• Modular Cartridge Kit Construction: Internal pumping elements (including cam ring, rotor, vanes, and flex side plates) are integrated into a self-contained cartridge kit. During field servicing, engineers can replace the entire cartridge without disconnecting the pump body from the prime mover, slashing downtime by 80%.

• Hydraulically Balanced Flex Plates: The wear side plates utilize a hydraulic balance layout that automatically self-adjusts axial clearance against the rotor face according to real-time loading. This advanced engineering maintains exceptional volumetric efficiency above 92% even at 200 bar continuous pressure.

• High-Integration Multi-Stage Configurations: Multi-link pumps (such as the SQP321) utilize a single shared inlet port to feed multiple internal independent chambers. This severely limits the amount of exterior low-pressure suction plumbing required, mitigating the risk of fluid cavitation.

Application Areas:

• Plastics & Rubber Machinery: High/low pressure dual circuits for clamping, locking, and injection strokes in injection molding machines.

• Metal Processing & Die-Casting: Injection booster systems for die-casting machines, hydraulic shears, and press brakes.

• Metallurgical & Central Power Units: Centralized hydraulic stations for large CNC machine tools and heavy-duty scrap balers.

• Marine & Deck Equipment: Hydraulic supply for windlass drives and stern ramp actuation mechanisms.

Expert Maintenance Tips:

• Pre-Priming Mandate: Vane pumps will not lift oil or deploy vanes without initial centrifugal force. Prior to starting up a newly installed pump or cartridge kit, pre-fill the housing entirely with clean hydraulic oil through the ports. Dry running for even a few seconds will result in immediate cartridge seizure.

• Strict Low-Speed Constraints: Prime movers must ramp speed above 600 rpm rapidly upon startup. If utilizing Variable Frequency Drives (VFD), ensure the lowest configured frequency setting does not drop pump rotational speeds below the 600 rpm threshold.

• Inlet Joint Leak Verification: Meticulously inspect the suction flange O-ring seal. Because vane pumps create a high vacuum pull at the inlet, the slightest microscopic joint leak will suck air into the stream, triggering intense aeration squealing and accelerated cavitation wear.