Product Description
Product Overview
The SQP43-42-38 (double pump) and SQP-432-50-25-12VQ-86DAB-S121 (triple pump) belong to the TOKYO KEIKI (formerly TOKIMEC) SQP Series — a globally recognized platform of high-pressure, low-noise, fixed displacement vane pumps engineered specifically for industrial hydraulic systems demanding quiet operation. The SQP series encompasses 4 frame sizes, 16 series configurations, and 32 displacement options, enabling users to select the optimal combination for maximum energy efficiency.
The SQP43-42-38 is a dual-stage pump integrating two independent pumping elements within a single housing: a shaft-end pump (SQP4 frame, displacement code 42, 134 mL/rev) and a cover-end pump (SQP3 frame, displacement code 38, 118 mL/rev). Both sections share a common drive shaft and suction port while providing separate discharge outlets. Combined theoretical output reaches approximately 453.6 L/min at 1800 rpm (actual output ≈408 L/min at ηv≥90%). This configuration enables a single motor to simultaneously supply a rapid-traverse circuit (large pump) and a feed circuit (small pump), reducing installation footprint by 30-50%.
The SQP-432-50-25-12VQ-86DAB-S121 is a triple-stage pump integrating three independent pumping elements: a shaft-end pump (SQP4 frame, displacement code 50, 156 mL/rev), a middle pump (SQP3 frame, displacement code 25, 79.2 mL/rev), and a cover-end pump (SQP2 frame, displacement code 12VQ, 38.3 mL/rev). Combined theoretical output reaches approximately 492.3 L/min at 1800 rpm (actual output ≈443 L/min at ηv≥90%). The triple configuration enables a single motor to simultaneously drive three independent hydraulic circuits with individual pressure control, achieving circuit simplification and noise reduction compared to using a single large variable displacement pump.
Both models feature drop-in interchangeability with original TOKYO KEIKI specifications, 100% factory testing under simulated working conditions, and a modular cartridge kit design for rapid field service. SQP cartridge kits are fully interchangeable with Vickers V-series pump cores, maximizing spare parts commonality.
Technical Specifications
Model SQP43-42-38 (Double Pump):
Shaft-End Pump (P1, SQP4 Frame):
- Displacement Code: 42
- Geometric Displacement: 134 mL/rev (8.18 in³/rev)
- Rated Continuous Pressure: 17.2 MPa (172 bar / 2500 psi)
- Peak Pressure: 18.9 MPa (189 bar / 2750 psi, max 0.5 sec duration)
- Theoretical Flow (@1800 rpm): approx. 241.2 L/min
- Actual Output Flow (@1800 rpm, ηv≥90%): approx. 217 L/min
Cover-End Pump (P2, SQP3 Frame):
- Displacement Code: 38
- Geometric Displacement: 118 mL/rev (7.20 in³/rev)
- Rated Continuous Pressure: 17.2 MPa (172 bar / 2500 psi)
- Peak Pressure: 18.9 MPa (189 bar / 2750 psi, max 0.5 sec duration)
- Theoretical Flow (@1800 rpm): approx. 212.4 L/min
- Actual Output Flow (@1800 rpm, ηv≥90%): approx. 191 L/min
Common Double Pump Parameters:
- Pump Series: SQP43 Dual Balanced Vane Pump (TOKYO KEIKI)
- Combined Theoretical Flow (@1800 rpm): approx. 453.6 L/min
- Combined Actual Output Flow (@1800 rpm, ηv≥90%): approx. 408 L/min
- Maximum Speed: 1800 rpm
- Minimum Stable Speed: 600 rpm
- Control Type: Fixed Displacement, dual independent outputs
- Rotation: Clockwise (viewed from shaft end), no mark = CW
- Shaft Type: Not specified in model code (standard options: Type 1 straight key, Type 11 spline, Type 86 HD straight key)
- Outlet Port Positions: Not specified (configurable A/B/C/D combinations available)
- Mounting: Not specified (default: flange mounting)
- Design No.: Not specified (standard: 18)
- Hydraulic Fluid: Mineral-based anti-wear hydraulic oil (ISO VG 32/46/68); F3 (phosphate ester) and F11 (water-glycol) variants available
- Volumetric Efficiency: ≥90%
- Noise Level: ≤62 dB(A)
- Weight: approx. 55 kg (121 lbs) (estimated, including dual cartridges and shared housing)
- Housing Material: High-strength thickened cast iron
- Seal Material: NBR (standard)
Model SQP-432-50-25-12VQ-86DAB-S121 (Triple Pump):
Shaft-End Pump (P1, SQP4 Frame):
- Displacement Code: 50
- Geometric Displacement: 156 mL/rev (9.52 in³/rev)
- Rated Continuous Pressure: 17.2 MPa (172 bar / 2500 psi)
- Peak Pressure: 18.9 MPa (189 bar / 2750 psi, max 0.5 sec duration)
- Theoretical Flow (@1800 rpm): approx. 280.8 L/min
- Actual Output Flow (@1800 rpm, ηv≥90%): approx. 253 L/min
Middle Pump (P2, SQP3 Frame):
- Displacement Code: 25
- Geometric Displacement: 79.2 mL/rev (4.83 in³/rev)
- Rated Continuous Pressure: 17.2 MPa (172 bar / 2500 psi)
- Peak Pressure: 18.9 MPa (189 bar / 2750 psi, max 0.5 sec duration)
- Theoretical Flow (@1800 rpm): approx. 142.6 L/min
- Actual Output Flow (@1800 rpm, ηv≥90%): approx. 128 L/min
Cover-End Pump (P3, SQP2 Frame):
- Displacement Code: 12VQ
- Geometric Displacement: 38.3 mL/rev (2.34 in³/rev)
- Rated Continuous Pressure: 17.2 MPa (172 bar / 2500 psi)
- Peak Pressure: 18.9 MPa (189 bar / 2750 psi, max 0.5 sec duration)
- Theoretical Flow (@1800 rpm): approx. 68.9 L/min
- Actual Output Flow (@1800 rpm, ηv≥90%): approx. 62 L/min
Common Triple Pump Parameters:
- Pump Series: SQP432 Triple Balanced Vane Pump (TOKYO KEIKI)
- Combined Theoretical Flow (@1800 rpm): approx. 492.3 L/min
- Combined Actual Output Flow (@1800 rpm, ηv≥90%): approx. 443 L/min
- Maximum Speed: 1800 rpm
- Minimum Stable Speed: 600 rpm
- Control Type: Fixed Displacement, triple independent outputs
- Rotation: Clockwise (viewed from shaft end), no mark = CW
- Shaft Type: Type 86 Heavy-duty straight shaft with square key
- Outlet Port Positions: P1 at D (90° CW from suction, viewed from cover end); P2 at A (opposite inlet port); P3 at B (90° CCW from inlet)
- Mounting: Flange mounting (no mark)
- Design No.: S121 (special design number)
- Hydraulic Fluid: Mineral-based anti-wear hydraulic oil (ISO VG 32/46/68)
- Volumetric Efficiency: ≥90%
- Noise Level: ≤62 dB(A)
- Weight: approx. 85 kg (187 lbs) (estimated, including triple cartridges, shared housing, and drive shaft)
- Housing Material: High-strength thickened cast iron
- Seal Material: NBR (standard)
Key Technical Advantages
1. Patented Intra-Vane (Sub-Blade) Construction
The SQP series employs TOKYO KEIKI’s proprietary intra-vane mechanism — a secondary sub-vane is nested within the primary master vane, with pressurized oil channeled through internal passages in the rotor to act on the sub-vane cavity. This “hydraulic soft-loading” design precisely regulates the contact force between the vane tip and the cam ring surface, eliminating the spring fatigue failure mode inherent in conventional spring-loaded vane pumps. At 17.2 MPa, the contact force remains optimally controlled, ensuring reliable sealing while preventing excessive impact loading at high speeds. This fundamentally extends the service life of both the stator ring and vane elements, forming the core engineering basis for the SQP series’ industry-leading B10 bearing and component life.
The SQP series employs TOKYO KEIKI’s proprietary intra-vane mechanism — a secondary sub-vane is nested within the primary master vane, with pressurized oil channeled through internal passages in the rotor to act on the sub-vane cavity. This “hydraulic soft-loading” design precisely regulates the contact force between the vane tip and the cam ring surface, eliminating the spring fatigue failure mode inherent in conventional spring-loaded vane pumps. At 17.2 MPa, the contact force remains optimally controlled, ensuring reliable sealing while preventing excessive impact loading at high speeds. This fundamentally extends the service life of both the stator ring and vane elements, forming the core engineering basis for the SQP series’ industry-leading B10 bearing and component life.
2. 12-Vane System with Pulsation Attenuation for Ultra-Low Noise
The SQP pump features a 12-vane configuration (a multiple of 4) that minimizes instantaneous flow pulsation amplitude. Beyond this, the SQP series incorporates a dedicated pulsation attenuation structure — optimized distributor plate window geometry and transition zone angles that suppress pressure shock waves during the suction-to-discharge switching instant. Combined with the thickened cast iron housing’s superior sound-dampening properties, the SQP series achieves measured noise levels as low as 62 dB(A) — comparable to normal conversation volume and significantly lower than equivalent gear pumps (75-85 dB(A)) or piston pumps (80-90 dB(A)). This makes it ideal for noise-sensitive indoor environments such as precision injection molding facilities, electronics assembly lines, and medical equipment manufacturing.
The SQP pump features a 12-vane configuration (a multiple of 4) that minimizes instantaneous flow pulsation amplitude. Beyond this, the SQP series incorporates a dedicated pulsation attenuation structure — optimized distributor plate window geometry and transition zone angles that suppress pressure shock waves during the suction-to-discharge switching instant. Combined with the thickened cast iron housing’s superior sound-dampening properties, the SQP series achieves measured noise levels as low as 62 dB(A) — comparable to normal conversation volume and significantly lower than equivalent gear pumps (75-85 dB(A)) or piston pumps (80-90 dB(A)). This makes it ideal for noise-sensitive indoor environments such as precision injection molding facilities, electronics assembly lines, and medical equipment manufacturing.
3. High Volumetric Efficiency Across Wide Operating Envelope
The SQP series maintains volumetric efficiency consistently above 90% at 17.2 MPa working pressure, minimizing internal leakage energy losses. Precision-controlled axial clearances and a high-order, non-impact transition curve machined into the cam ring’s inner surface (surface roughness Ra 0.2μm) ensure this performance. The optimized inlet flow path provides excellent self-priming characteristics at high speeds (up to 1800 rpm), while the minimum stable speed of 600 rpm enables smooth, crawl-free output in low-speed precision feed applications.
The SQP series maintains volumetric efficiency consistently above 90% at 17.2 MPa working pressure, minimizing internal leakage energy losses. Precision-controlled axial clearances and a high-order, non-impact transition curve machined into the cam ring’s inner surface (surface roughness Ra 0.2μm) ensure this performance. The optimized inlet flow path provides excellent self-priming characteristics at high speeds (up to 1800 rpm), while the minimum stable speed of 600 rpm enables smooth, crawl-free output in low-speed precision feed applications.
4. Modular Cartridge Kit for Rapid Field Service
The complete working assembly — rotor, cam ring, vanes, and distributor plate — is integrated into a single removable cartridge kit. Field maintenance requires only end cover removal to extract and replace the cartridge; the pump body remains mounted on the machine. Factory-tested cartridge kits restore new-pump performance upon installation, reducing maintenance time from hours to minutes. Notably, SQP series cartridge kits are fully interchangeable with Vickers V-series pump cores, maximizing spare parts commonality and maintenance flexibility across equipment fleets.
The complete working assembly — rotor, cam ring, vanes, and distributor plate — is integrated into a single removable cartridge kit. Field maintenance requires only end cover removal to extract and replace the cartridge; the pump body remains mounted on the machine. Factory-tested cartridge kits restore new-pump performance upon installation, reducing maintenance time from hours to minutes. Notably, SQP series cartridge kits are fully interchangeable with Vickers V-series pump cores, maximizing spare parts commonality and maintenance flexibility across equipment fleets.
5. Multi-Stage Integration for System Simplification & Energy Savings
For the SQP43 double pump and SQP432 triple pump, multiple independent pumping elements share a single housing, drive shaft, and suction port while delivering separate discharge circuits. This integrated design enables a single motor to simultaneously drive multiple hydraulic circuits (e.g., rapid traverse + work feed + auxiliary circuit), reducing installation footprint by 30-50% and simplifying piping complexity. Using different displacement combinations with individual pressure control achieves circuit simplification and energy savings compared to using a single large variable displacement pump, while maintaining low noise levels across all circuits.
For the SQP43 double pump and SQP432 triple pump, multiple independent pumping elements share a single housing, drive shaft, and suction port while delivering separate discharge circuits. This integrated design enables a single motor to simultaneously drive multiple hydraulic circuits (e.g., rapid traverse + work feed + auxiliary circuit), reducing installation footprint by 30-50% and simplifying piping complexity. Using different displacement combinations with individual pressure control achieves circuit simplification and energy savings compared to using a single large variable displacement pump, while maintaining low noise levels across all circuits.
6. Thickened Housing & Superior Structural Integrity
The SQP series features a thickened cast iron housing providing superior structural rigidity, vibration resistance, and acoustic insulation. Critical friction pairs undergo special heat treatment achieving hardness above HRC 60, while the cam ring’s inner surface is super-finished to Ra 0.2μm, ensuring long-term sealing reliability under continuous high-pressure operation.
The SQP series features a thickened cast iron housing providing superior structural rigidity, vibration resistance, and acoustic insulation. Critical friction pairs undergo special heat treatment achieving hardness above HRC 60, while the cam ring’s inner surface is super-finished to Ra 0.2μm, ensuring long-term sealing reliability under continuous high-pressure operation.
Application Areas
- Injection Molding Machines: 50–1000 ton machines for clamp, ejector, core-pull, injection, and mold-adjustment circuits; SQP43 double pumps simultaneously supply rapid clamp (large pump) and precision holding pressure (small pump); SQP432 triple pumps can additionally supply core-pull or mold-adjustment circuits
- Die Casting Machines: Aluminum and zinc alloy die casting machines for injection, clamp, and core-pull circuits subject to cyclic shock loading
- Hydraulic Presses: Stamping, bending, deep drawing, and powder metallurgy press main drive circuits
- Industrial Power Units (HPU): Central hydraulic power sources serving multiple actuator circuits in manufacturing plants
- Machine Tool Hydraulics: Clamping, feed, and tool-change circuits on CNC machining centers and lathes
- Rubber Processing Machinery: Vulcanizing presses, internal mixers, and extruder hydraulic drive systems
- Construction Machinery: Auxiliary hydraulic circuits for excavators, loaders, and cranes
- Marine Deck Machinery: Steering gears, winches, and cargo handling hydraulic systems
Expert Maintenance Tips
- Fluid Cleanliness Control: Maintain system fluid cleanliness at ISO 4406 19/17/14 or better. Install a 100–180 mesh suction strainer with the strainer submerged at least 200 mm below the oil surface to prevent cavitation. A 10μm return-line filter is recommended. Contaminated fluid is the leading cause of abnormal vane wear and cam ring scoring.
- Viscosity & Temperature Management: Use ISO VG 32–68 anti-wear hydraulic oil. Maintain operating oil temperature between 30–55°C (corresponding to kinematic viscosity of 17–37 mm²/s). For cold starts below 10°C, perform a no-load warm-up cycle to prevent cavitation from high-viscosity fluid. Normal operating temperature should be maintained at 30–50°C.
- Never Operate Dry: Running the SQP pump without fluid causes instant dry-friction damage to vane tips and the cam ring. After installation or prolonged storage, pre-fill the pump cavity through the case drain port with clean fluid, manually rotate the coupling 2-3 turns to expel trapped air, and verify smooth rotation before starting.
- Shaft Alignment & Coupling Selection: Maintain shaft misalignment within 0.1 mm. Use a flexible coupling (jaw-type or tire-type) to absorb installation errors and axial float. Never use rigid couplings, as radial side-loads will cause premature bearing failure.
- Suction Line Requirements: Keep suction piping as short and large-diameter as possible — pipe bore must not be smaller than the pump suction port. Maintain suction pressure above 0.05–0.1 MPa; negative pressure at the suction port will cause increased noise and reduced volumetric efficiency. Ensure all suction line connections are airtight.
- Cartridge Replacement Procedure: When replacing the cartridge kit, ensure the distributor plate is correctly located using alignment dowel pins. Verify vane chamfer orientation (do not install vanes in reverse). Confirm the cam ring’s suction and discharge zones are correctly aligned. After assembly, manually rotate the shaft to verify smooth, binding-free operation. Tighten fastening screws with even force in a diagonal pattern. For new cartridge installation, recommend a 10–20 minute no-load run-in period before gradually increasing to working pressure.
- Multi-Stage Pump Specific Maintenance: The SQP43 double pump and SQP432 triple pump feature independently sealed cartridge sections — each pump element can be replaced individually without disturbing the others. However, ensure displacement codes are never cross-installed between sections, as mismatched displacements will cause flow imbalance and system pressure anomalies. For triple pumps, inspect and replace cartridges in order from shaft end to cover end.
- Axial Clearance Inspection: Axial clearance critically affects volumetric efficiency. Small pumps (SQP1/SQP2 frames) should maintain 0.015–0.03 mm; medium/large pumps (SQP3/SQP4 frames) should maintain 0.02–0.045 mm. Excessive clearance increases internal leakage and reduces pressure; insufficient clearance prevents free vane movement and causes operational failure.
Company Profile
Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
5.Which payment methods are accepted?
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
6.How will you deliver my goods?
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
All deliveries ensure door-to-door fast and safe service.
7.How do you inspect and guarantee your products?
All products are tested before shipment to ensure perfect working condition.
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
8.What about after-sales service?
If you encounter any problem during use, please contact your sales manager or our support team at any time.
We will respond quickly and help solve the issue efficiently.
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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