SQP high pressure quantitative vane pump
SQP Vane Pump: Tokyo Keiki Low-Noise High-Pressure Fixed Displacement Vane Pump Series
The SQP vane pump is a series of low-noise, high-pressure, fixed-displacement double-acting cartridge vane pumps developed and manufactured by Japan’s TOKYO KEIKI (formerly TOKIMEC). It is renowned for its low noise, high volumetric efficiency, long service life and high reliability, and is widely applied in industrial hydraulic systems.
1. Core Positioning and Working Principle
Core Positioning: A high-performance cartridge vane pump designed for low-noise working conditions. As a fixed-displacement double-acting vane pump, it completes two oil suction and discharge cycles per rotor revolution, featuring low flow pulsation and stable pressure.
Working Principle:
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The motor drives the rotor to rotate. The cartridge vanes extend under centrifugal force and pressure oil, closely fitting the inner curve of the stator.
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The stator adopts a precision-ground double-suction and double-discharge inner curve structure to form sealed working chambers.
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The volume of the working chambers changes periodically with rotor rotation: oil is sucked in when the volume expands, and discharged when the volume shrinks.
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The valve plate adopts a pressure balance and pulsation damping groove design, which effectively reduces pressure pulsation and operating noise (3–5 dB noise reduction).
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The cartridge vane structure greatly reduces internal leakage, improving volumetric efficiency and working pressure.
2. Core Technical Characteristics
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Characteristics
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Technical Advantages
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Application Value
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Ultra-Low Noise
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Pulsation damping structure + thickened cast iron housing + optimized valve plate
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Suitable for noise-sensitive equipment such as precision machine tools, medical equipment and indoor production lines
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High Pressure Performance
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Wear-resistant design for sliding parts + cartridge vane structure
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Rated pressure: 17.5–21 MPa, peak pressure up to 25 MPa, meeting high-pressure working conditions
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High Volumetric Efficiency
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Precision fitting + internal leakage control technology
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Efficiency reaches over 95%, delivering significant energy-saving effects
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Long Service Life Design
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High-quality materials + wear-resistant coating + pressure balance structure
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Long service life and low maintenance cost
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Flexible Combination
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Multiple combination modes: single, double and triple pumps
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Adapt to complex hydraulic systems and simplify circuit design
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Interchangeable Pump Core
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Adopts V-series cartridge vane pump cores
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Convenient maintenance and replacement with strong universality
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Shock Resistance & Durability
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Thickened cast iron / ductile iron housing
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Adapt to harsh working conditions with high stability
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3. Model Specification System
3.1 Basic Model Classification
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Type
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Model Series
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Displacement Range (cm³/r)
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Rated Pressure (MPa)
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Typical Applications
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Single Pump
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SQP1
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7.5–44.2
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17.5
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Light-duty small equipment, general hydraulic systems
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SQP2
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32.5–65
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21
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Machine tools, injection molding machines and other medium-pressure & medium-flow systems
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SQP3
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53.5–100
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21
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Die-casting machines, heavy-duty machine tools and other high-pressure & high-flow systems
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SQP4
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80–180
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21
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Large hydraulic equipment, high-power systems
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Tandem Double Pump
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SQP21/SQPS21, SQP31/SQPS31, SQP32/SQPS32, SQP41/SQPS41, etc.
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Combination of two different displacements
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21
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Multi-actuator systems for energy saving
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Tandem Triple Pump
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SQP211, SQP311, SQP321, SQP421, SQP431, SQP432, etc.
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Combination of three different displacements
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21
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Complex hydraulic systems with multi-loop control
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3.2 Model Coding Rules (Taking SQP21-17-14-1CC-18 as an Example)
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Code Segment
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Meaning
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Description
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SQP21
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Basic Model
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SQP = Series name; 21 = Tandem double pump (shaft end: Series 2, cover end: Series 1)
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17
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Shaft End Pump Displacement
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17 cm³/r
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14
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Cover End Pump Displacement
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14 cm³/r
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1
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Shaft Type
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1 = Flat key shaft
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CC
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Oil Port Orientation
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Indicates the position of oil inlet and outlet
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18
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Design Code
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Tokyo Keiki standard design number
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3.3 Special Specifications
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Hydraulic Oil Type: Standard (NBR seal) for petroleum-based hydraulic oil; F3 specification (FKM seal) for phosphate ester hydraulic fluid; F11 specification for water-glycol hydraulic fluid.
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Installation Method: Flange mounting, foot mounting and other optional methods.
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Shaft End Type: Flat key, spline and other types to match different motor connections.
4. Application Fields
With excellent comprehensive performance, SQP vane pumps are widely used in the following industries:
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Plastic Machinery: Main hydraulic systems of injection molding machines, extruders, blow molding machines, etc.
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Die-Casting Machinery: High-pressure hydraulic systems of aluminum alloy and zinc alloy die-casting machines.
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Machine Tool Equipment: Precision hydraulic systems of CNC machining centers, grinders, punching machines, bending machines, etc.
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Construction Machinery: Hydraulic systems of small excavators, loaders, forklifts and other mobile machinery.
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Shipbuilding Industry: Marine deck machinery, steering gear systems, hatch cover hydraulic systems.
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Other Fields: Hydraulic presses, hydraulic test benches, environmental protection equipment, automatic production lines, etc.
5. Operation and Maintenance Guidelines
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Installation Requirements
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Ensure the coaxiality between the pump shaft and motor shaft (≤0.05 mm) to avoid bearing damage caused by eccentric load.
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The diameter of the oil suction pipeline shall not be smaller than the pump suction port diameter to reduce suction resistance and prevent cavitation.
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The installation position shall ensure a sufficient suction height (≤500 mm generally).
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Hydraulic Oil Selection
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ISO VG32 or VG46 anti-wear hydraulic oil is recommended, with oil temperature controlled at 10–60°C.
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The oil cleanliness shall reach NAS 7 level or higher. It is recommended to install a 10 μm suction filter and a 5 μm high-pressure filter.
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Maintenance Cycle
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Replace hydraulic oil and filters after the first 500 hours of operation.
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Replace hydraulic oil every 2000–3000 hours of normal operation, and inspect filters every 1000 hours.
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Regularly check pump noise, vibration and leakage, and stop operation for maintenance in case of abnormalities.
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Common Fault Troubleshooting
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Excessive noise: Check oil level, air leakage in suction pipeline and filter blockage.
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Insufficient pressure: Check vane wear, valve plate clearance and seal damage.
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Reduced flow: Check stator inner curve wear, vane jamming and excessive oil temperature.
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6. Summary
The SQP vane pump is a classic series of Tokyo Keiki products, representing the advanced level of low-noise and high-pressure fixed-displacement vane pumps. Its cartridge vane structure,pulsation damping technology and flexible combination design make it an ideal choice for industrial hydraulic systems, especially suitable for working conditions with high requirements for noise control, pressure stability and energy efficiency.
