Tokyo Keiki SQP Series Vane Pump | SQP21 SQP31 SQP41 | High Pressure Double Vane Pump

Chengyuan Hydraulic offers the SQP Series vane pumps, engineered as high-pressure, low-noise hydraulic power sources compatible with Tokyo Keiki (formerly Vickers) industrial standards. This series includes single and double pumps (such as SQP21, SQP31, and SQP41), specifically designed for precision machine tools, injection molding machines, and die-casting equipment.

Chengyuan guarantees 100% Drop-in Interchangeability for the SQP series in terms of mounting dimensions, shaft specifications (splined or keyed), and port flanges. Backed by our 100% Simulation Load Testing, every SQP pump is validated for pressure pulsation and volumetric efficiency before shipment, ensuring extremely low noise levels and superior stability under continuous high-pressure operation.

Technical Specifications

• Series Models: SQP21 / SQP31 / SQP41 Double Pumps

• Rated Pressure: 21 MPa (210 bar)

• Peak Pressure: 25 MPa (250 bar)

• Shaft-End Displacement: From 14 $cm^3$/rev to 193 $cm^3$/rev (depending on cartridge kit)

• Max Speed: 1800 rpm

• Min Speed: 600 rpm

• Control Type: Fixed displacement

• Drive Shaft Options: Standard Straight Keyed (1) or 13-Tooth Spline (86)

• Outlet Port Positions: Multiple angles available (A, B, C, D configurations)

• Working Medium: Anti-wear hydraulic oil, water-glycol (with specific seals)

Key Technical Advantages:

• Multi-Pump Flexibility: The SQP double pump allows free combination of different cartridge kits to achieve varied flow rates. This enables energy-saving operations by providing high flow for rapid movement and low flow for high-pressure holding.

• Ultra-Low Operating Noise: Featuring a unique 12-vane design and optimized internal flow passages, the pump minimizes pressure ripples. Even at 21MPa full load, the noise level remains 3-5 dB(A) lower than competing products, ideal for quiet workshop environments.

• Rapid On-site Maintenance: The internal cartridge kit design allows for quick servicing. When wear occurs, users can replace the internal kit without disconnecting the pump from the machine, significantly reducing downtime.

• High-Pressure Stability: Utilizing floating side-plate pressure compensation, the end-face clearance adjusts automatically with system pressure changes, maintaining a volumetric efficiency of over 90% even at high pressures.

Application Areas:

• Machine Tools: Power units for grinding and milling machines.

• Plastic Machinery: Mold shifting and clamping circuits in injection molding machines.

• Die-Casting Equipment: High-frequency, high-pressure continuous cycling operations.

• Shoe Machinery: Hydraulic stations for automated shoe production lines.

Expert Maintenance Tips:

• Oil Filtration: The SQP series is highly sensitive to contamination. We recommend return filters no coarser than 10μm to maintain oil cleanliness at NAS Class 9 or higher.

• Pre-Start Lubrication: During initial installation or after an overhaul, fill the pump with clean hydraulic oil through the inlet and rotate the shaft manually to ensure internal components are lubricated before start-up.

• Suction Line Integrity: Rigorously check the suction flange seals. Due to the high suction vacuum of the SQP pump, even minor leaks can lead to cavitation, causing severe noise and immediate damage to the cartridge kit.