Product Overview
The VPSM-PSFO-9AR-20 belongs to the YUKEN VPSM-PSF0/PSFO series of high-pressure variable displacement vane pumps, with a displacement of 9 cm³/rev, a rated working pressure of 21 MPa (210 bar), and a peak pressure of 25 MPa (250 bar). The series is purpose-designed for industrial hydraulic systems, known for high efficiency, low noise, and long service life, and is widely used in machine tools, injection molding machines, die-casting machines, and other industrial hydraulic applications requiring high-pressure precision control.
Important Product Type Note: Although the original title labels this as a “Piston Pump,” according to YUKEN’s official product catalog and multiple authorized distributor technical references, the VPSM-PSF0/PSFO series is a Variable Displacement Vane Pump. It utilizes pressure compensator control to automatically vary displacement by adjusting the stator eccentricity. This product is not a piston pump construction. Verify product type during selection to avoid mounting interface and system matching errors.
The VPSM series is a single variable vane pump with pressure compensator control. When system pressure reaches the set value, the stator automatically returns to center, reducing displacement to minimum and maintaining only the flow required to sustain system pressure. This effectively reduces power loss and oil temperature rise. The YUKEN VPSM series was discontinued for orders as of September 30, 2023. Current market availability consists of existing inventory and alternative models.
Manufactured to exact YUKEN VPSM platform specifications, this pump delivers true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.
Technical Specifications
The following specifications are based on YUKEN VPSM-PSF0/PSFO series official technical data and authorized distributor published references:
VPSM-PSFO-9AR-20
Model: VPSM-PSFO-9AR-20
Manufacturer: YUKEN
Series: VPSM-PSF0/PSFO
Design: Variable displacement vane pump (pressure compensator type)
Displacement: Approx. 9 cm³/rev (confirm exact value against YUKEN official technical manual)
Rated Working Pressure: 21 MPa (210 bar)
Peak Pressure: 25 MPa (250 bar)
Control Type: Pressure compensator control (PC type)
Mounting: SAE AA flange
Rotation Direction: Right hand (R, viewed from shaft end)
Pressure Adjustment Range: 35–70 bar (PC control setting range, reference VPSM-PSF0-9BR-20 data)
Operating Fluid: Mineral hydraulic oil (ISO VG 32–68)
System Type: Open-circuit hydraulic system
Weight (Reference): Approx. 6 kg (VPSM-PSFO-9BR-20 reference)
Fluid Cleanliness Requirement: NAS 9 or ISO 18/16/13 or better recommended
VPSM-PSFO-9BR-20
Model: VPSM-PSFO-9BR-20
Manufacturer: YUKEN
Series: VPSM-PSF0/PSFO
Design: Variable displacement vane pump (pressure compensator type)
Displacement: Approx. 9 cm³/rev (actual value approx. 8.6 cm³/rev)
Rated Working Pressure: 21 MPa (210 bar)
Peak Pressure: 25 MPa (250 bar)
Control Type: Pressure compensator control (PC type)
Mounting: SAE AA flange
Rotation Direction: Right hand (R, viewed from shaft end)
Pressure Adjustment Range: 35–70 bar (PC control setting range)
Operating Fluid: Mineral hydraulic oil
System Type: Open-circuit hydraulic system
Weight: Approx. 6 kg
VPSM-PSE0-16AR-0
Model: VPSM-PSE0-16AR-0
Manufacturer: YUKEN
Series: VPSM series (PSE0 variant)
Design: Variable displacement vane pump
Displacement: Approx. 16 cm³/rev (confirm against YUKEN official technical manual)
Rated Working Pressure: 21 MPa (210 bar)
Peak Pressure: 25 MPa (250 bar)
Control Type: Pressure compensator control
Mounting: SAE flange
Operating Fluid: Mineral hydraulic oil
Key Technical Advantages
1. High-Pressure Capability and High Volumetric Efficiency
The VPSM series variable vane pump achieves working pressures up to 21 MPa (210 bar) with peak pressure of 25 MPa (250 bar), placing it in the medium-high pressure hydraulic pump category. The pump delivers high-pressure output at moderate displacement with high volumetric efficiency, suitable for industrial hydraulic systems requiring precision pressure control, such as machine tool hydraulic power units and injection molding machine hydraulic circuits.
2. Energy-Saving Pressure Compensator Control
The pump employs pressure compensator control — when system pressure reaches the set value, the stator automatically returns to center, reducing displacement to minimum and outputting only the small flow required to maintain system pressure. This characteristic significantly reduces power loss and oil temperature rise in machine tool holding, clamping, and pressure-maintenance cycles, reducing cooling system load. The pressure adjustment range is 35–70 bar, flexibly settable for specific operating conditions.
3. Low-Noise Operation and Compact Design
The VPSM series uses an optimized stator curve and port plate design to maintain low-noise operation across the full pressure range. The compact pump body weighs only approximately 6 kg, with a small installation envelope suitable for space-constrained industrial hydraulic power units and machine tool integration. SAE AA standard flanges and shafts ensure interchangeability with original products.
4. 100% Simulated Operating Condition Testing
Every pump undergoes a comprehensive factory test protocol: continuous operation at 21 MPa rated pressure to verify volumetric and total efficiency, 25 MPa peak pressure cycling to validate housing and seal integrity, and full-speed-range verification of pressure compensator response. Test documentation is supplied with each unit.
Application Areas
Machine Tool Hydraulic Systems: CNC machine tools, machining center hydraulic power units — pressure compensator control suits clamping and holding duty
Injection Molding and Die-Casting Machines: Hydraulic power systems accommodating cyclic high-pressure holding requirements
Industrial Hydraulic Power Units: Medium-high pressure industrial hydraulic power units
Forging and Press Equipment: Hydraulic presses and stamping machine hydraulic power systems
Automated Production Lines: Hydraulic actuation systems requiring precision pressure control
Expert Maintenance Tips
1. Pressure Compensator Setting Calibration
The VPSM series uses pressure compensator control, where the setting directly affects system pressure and pump displacement response. After pump replacement, verify the compensator crack pressure-to-displacement relationship at rated speed, confirming it falls within the factory calibration range. Never adjust the pressure compensator beyond the system maximum pressure setting. The adjustment range is 35–70 bar — adjust gradually to avoid sudden changes.
2. Suction Line Requirements
Suction line diameter must accommodate pump flow demand at maximum speed to avoid negative pressure and cavitation. Recommended suction line ID should be no smaller than the pump inlet port size. The suction inlet should sit at least 100 mm below the reservoir oil level. Inspect or replace the suction filter every 500 hours.
3. Mandatory Case Pre-Fill and Air Purging at First Installation
After installation, the pump housing must be filled with clean hydraulic fluid. Starting a vane pump dry will rapidly cause wear to the stator, vanes, and port plate. Fill through the highest case port with fluid filtered to ≤10 μm until oil overflows. Open the bleed plug and run at idle until bubble-free oil flows continuously. Do not apply load until the system is confirmed air-free.
4. Fluid Cleanliness and Viscosity Control
Maintain system cleanliness at NAS 9 or ISO 18/16/13 or better. Recommended operating viscosity is ISO VG 32–68, with an optimum range of 14–50 cSt. Install a 10 μm nominal filtration element in the suction line; replace after the first 200 hours, then inspect or replace every 500 hours.
5. Replacement Considerations for Discontinued Model
The YUKEN VPSM series was discontinued for orders as of September 30, 2023. For replacement, confirm whether the existing system can accommodate YUKEN’s successor series (such as the PVVQ series) or an equivalent model. Verify mounting flange, shaft, port positions, and control type compatibility during replacement, and adjust system piping as necessary.
