Rexroth A2VK Series Metering Pumps
A2VK55MAGR1G1PE1-SO2 | A2VK28MAOR1G1PE2-SO2 | A2VK12MARL4G0PE1-SO2
The Rexroth A2VK series axial piston variable metering pumps are high-performance hydraulic metering products specifically designed for precision applications including polyurethane foaming, chemical metering, and high-pressure fluid transfer. Featuring swashplate variable displacement design with high metering accuracy, wide flow adjustment range, and high working pressure, these pumps are widely used in injection molding machinery, chemical equipment, construction machinery, and other industrial fields.
Product Model Comparison
| Parameter |
A2VK55MAGR1G1PE1-SO2 |
A2VK28MAOR1G1PE2-SO2 |
A2VK12MARL4G0PE1-SO2 |
| Series |
A2VK |
A2VK |
A2VK |
| Theoretical Displacement |
55 mL/r |
28 mL/r |
12 mL/r |
| Rotation Direction |
Right-hand |
Right-hand |
Left-hand |
| Control Type |
Manual (with handwheel) |
Manual (with handwheel) |
Manual (with handwheel) |
| Rated Pressure |
250 bar |
250 bar |
250 bar |
| Peak Pressure |
315 bar |
315 bar |
315 bar |
| Mounting Flange |
SAE standard |
SAE standard |
SAE standard |
| Seal Material |
NBR/FKM optional |
NBR/FKM optional |
NBR/FKM optional |
| Suitable Media |
Polyurethane components, hydraulic oil |
Polyurethane components, hydraulic oil |
Polyurethane components, hydraulic oil |
| Typical Speed |
735-1800 rpm |
735-1800 rpm |
735-1800 rpm |
Key Features
High Precision Metering Performance
- High repeatability: Metering repeatability error ≤ ±1% at each flow point
- Precise manual adjustment: Integrated precision handwheel with scale for stepless flow adjustment
- Low pulsation output: Optimized port plate design for smooth system operation
Reliable Structural Design
- Swashplate variable mechanism: Compact structure with fast response
- Dual shaft seal system: Equipped with buffer fluid port to prevent leakage and extend service life
- Special material pairing: Key components use materials compatible with polyurethane media
Wide Applicability
- Good media compatibility: Suitable for polyol, isocyanate, and standard hydraulic oil
- Wide viscosity range: Can handle media from 100 to 4000 cSt
- Temperature adaptability: Operating temperature range -20°C to +80°C
Easy Installation & Maintenance
- Standard interface design: SAE standard flange and shaft for easy system integration
- Modular structure: Main components can be replaced independently
- Drain port design: Independent drain line for easy oil return management
Technical Specifications
Basic Performance
- Working pressure: Rated 250 bar, peak 315 bar (short-term)
- Displacement range: 0 to maximum displacement continuously adjustable
- Volumetric efficiency: ≥95% (rated condition)
- Overall efficiency: ≥90% (rated condition)
- Allowable inlet pressure: 0.1-0.3 MPa for open circuit
Installation Requirements
- Mounting position: Any position, but handwheel shaft should be horizontal
- Coupling requirement: Shaft alignment error ≤0.1mm
- Inlet line: Recommended hose inner diameter ≥12mm
- Drain line: Separate connection to tank, back pressure ≤0.2 MPa
Operating Conditions
- Hydraulic oil: Recommended ISO VG 46 or VG 68
- Filtration: 10-20μm at inlet
- Oil temperature: Normal 15-60°C, max 80°C
- First start: Fill pump with oil before first start
Application Areas
Polyurethane Foaming Equipment
- High-pressure foaming machine metering units
- Two-component polyurethane mixing systems
- Spray foaming equipment
Chemical Metering Systems
- High-viscosity media metering and transfer
- Precision batching systems
- Reactor feed control
Industrial Hydraulic Systems
- Construction machinery hydraulic systems
- Injection molding machine hydraulic units
- Marine machinery hydraulic power
Frequently Asked Questions
How to correctly select pump rotation direction?
Answer: Pump rotation direction (right-hand R or left-hand L) should match the drive motor rotation. When viewed from the drive end, clockwise motor rotation requires right-hand pump, counterclockwise requires left-hand pump. Incorrect selection may cause pump failure or damage. Confirm motor rotation direction during selection.
What precautions should be taken for first start of new pump?
Answer: Before first start, fill the pump casing with clean hydraulic oil to the middle of oil level gauge, manually rotate the pump shaft several times to ensure oil filling. Run without load for 5-10 minutes, check for abnormal noise or leakage. If air is present, loosen vent screw or open fill port to release air. After first run, recommend changing hydraulic oil once to remove initial wear particles.
What to do if flow adjustment is inaccurate or cannot be adjusted?
Answer: First check if handwheel adjustment mechanism is stuck, try rotating handwheel back and forth several times. If still not adjustable, possible causes include: internal mechanism blockage, control piston wear, spring failure, etc. Contact technical personnel for inspection. Keep adjustment mechanism clean and lubricate regularly.
What causes abnormal noise in the pump?
Answer: Common causes: ① Air leakage or blockage in suction line causing cavitation; ② Low oil level or high viscosity; ③ Misalignment between pump and motor; ④ Internal component wear (port plate, pistons, etc.). Check external factors first (oil level, lines, coupling), if problem persists, inspect internal wear.
How to handle excessive leakage?
Answer: Excessive leakage may be caused by: ① Shaft seal wear or damage (replace seal); ② Wear between port plate and cylinder block (grind or replace); ③ Excessive clearance between piston and cylinder bore (replace piston assembly). Regularly check leakage, if significantly increased, stop and inspect to prevent pump damage due to oil shortage.
After-sales Service & Technical Support
- Warranty period: 12 months from date of shipment
- Technical support: Selection consultation, installation guidance, troubleshooting
- Spare parts: Common parts in stock, quick response
- Repair service: Authorized service network nationwide
Ordering Information
For ordering or detailed technical documents, please contact local Rexroth authorized distributor or Rexroth sales representative. Provide complete model number, quantity, delivery requirements, and we will provide professional technical support and quotation.
Disclaimer: This product information is based on Rexroth official technical data. Product specifications are subject to change without notice. Confirm product parameters meet your system requirements before application. Rexroth reserves final interpretation rights.
Release Date: January 2026 | Publisher: Rexroth (China) Co., Ltd.
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