A3HG Series Yuken High Pressure Variable Displacement Piston Pumps

1. Core Product Overview

• Design Principle: Adopting an optimized swash plate mechanism with reinforced components, the A3HG Series realizes stepless adjustment of displacement by changing the swash plate angle, which can precisely match the flow demand of the system, effectively reducing energy loss and improving the overall efficiency of the hydraulic system.
• Series Coverage: Models include A3HG10, A3HG16, A3HG22, A3HG37, A3HG56, A3HG70, A3HG90, A3HG100, A3HG145, and A3HG220, with geometric displacements ranging from 10 cm³/rev to 219 cm³/rev (0.610–13.36 in³/rev), covering a variety of flow demand scenarios.
• Pressure Rating: The maximum operating pressure of standard models can reach 42 MPa (6,090 psi), and some ultra-high-pressure variants can withstand operating pressure up to 45 MPa (6,525 psi), suitable for ultra-high-pressure hydraulic system applications.
• Installation Flexibility: The compact and modular design supports both flange and foot-mounted installation methods, and the standardized interface design facilitates quick integration into various types of hydraulic equipment, reducing installation difficulty and time.

2. Key Technical Specifications

3. Versatile Control Options

1. Pressure Compensator (FR Control):
2. Automatically stabilizes the system pressure, with strong anti-interference ability, suitable for ultra-high-pressure systems with fluctuating loads.
3. Real-time adjustment of output flow according to load changes, minimizing overflow loss and reducing system heat generation.
4. Ideal for ultra-high-pressure applications with varying load demands, such as heavy-duty forging equipment.
5. Dual Pressure Control (02):
6. Realizes seamless switching between high and low pressure, with fast switching response and stable pressure transition.
7. Perfect for ultra-high-pressure systems that require different pressure levels (e.g., ultra-high-pressure clamping and low-pressure feeding of large injection molding machines).
8. Load Sensing Control (LS):
9. Precisely adjusts the pump output flow according to the actual demand of the system, avoiding energy waste caused by excessive flow.
10. Effectively reduces the operating noise of the pump under light load conditions and extends the service life of the pump.
11. Proportional Control (04E):
12. Uses external electronic signals to realize precise regulation of flow and pressure, with high control accuracy and good linearity.
13. Requires a separate amplifier for operation, which can be flexibly matched with various automatic control systems.
14. Suitable for automated ultra-high-pressure systems that require remote control and precise adjustment, such as CNC heavy-duty machine tools.
15. Electric Proportional Control with Onboard Electronics (04):
16. Integrated electronic control module, simplifying the installation and debugging process, and reducing the occupied space of the system.
17. Directly interfaces with PLC or other control systems, realizing intelligent control of the hydraulic system.
18. Pressure and Flow Compound Control (14):
19. Combines pressure and flow control functions, providing comprehensive protection for ultra-high-pressure systems.
20. Prevents system overload and damage under extreme pressure conditions, improving system safety and reliability.

4. Distinctive Advantages

• Excellent Ultra-High-Pressure Performance: The reinforced structural design and high-strength alloy materials enable the pump to stably operate under ultra-high pressure for a long time, with strong pressure resistance and low leakage, reducing the failure rate of ultra-high-pressure systems.
• Enhanced Anti-Pollution Capability: The improved oil distribution structure and high-precision filter element design effectively resist the impact of oil impurities, adapting to harsh working environments with poor oil quality.
• Superior Reliability: The robust overall structure, high-wear-resistant piston and swash plate components with special surface treatment ensure a long service life, even under continuous heavy-duty operation conditions.
• Precise Control Performance: The high-sensitivity swash plate adjustment mechanism realizes fast response and precise control of flow and pressure, improving the stability and accuracy of the hydraulic system.
• Advanced Sealing Technology: Special high-pressure sealing components with reinforced design prevent internal and external leakage under ultra-high pressure conditions, ensuring system efficiency and safety.
• Easy Maintenance: The modular design simplifies the disassembly and assembly process, and the standardized spare parts are easy to replace, reducing maintenance costs and downtime.

5. Typical Application Scenarios

6. Model Nomenclature Example

• A3HG: Series identifier (A3HG Series ultra-high-pressure variable displacement piston pump)
• 16: Nominal displacement (15.8 cm³/rev)
• F: Flange mounting (alternative: J for foot mounting)
• R: Clockwise rotation (looking at shaft end)
• 01: Pressure compensator control type
• C: High-pressure seal material (adapt to ultra-high temperature and pressure conditions)
• K: Reinforced shaft type (high-strength straight shaft)
• 32: High-pressure O-ring material (special nitrile rubber, suitable for ultra-high-pressure hydraulic oil)

7. Installation and Maintenance Tips

1. Mounting: Ensure accurate alignment between the pump and the drive motor, and the coaxiality error shall not exceed 0.08 mm to avoid shaft stress and premature wear under ultra-high pressure.
2. Fluid Requirements: Use clean ultra-high-pressure hydraulic oil with recommended viscosity (ISO VG 46–68), and the oil cleanliness shall meet NAS 7 or higher standards.
3. Filtration: Install a high-quality filter (3 μm or better) at the inlet and outlet of the pump to effectively filter impurities in the oil and protect internal components under ultra-high pressure.
4. Priming: Fill the pump casing with hydraulic oil before initial start-up to prevent dry running and avoid damage to the piston and oil distribution plate.
5. Regular Inspection: Regularly check for oil leaks, abnormal noise, and vibration during operation, and promptly handle abnormalities to avoid further damage to the pump. Special attention should be paid to high-pressure sealing components.
6. Scheduled Maintenance: Follow the manufacturer’s guidelines to regularly replace hydraulic oil and filters, and check the wear of key components (such as pistons and swash plates) to ensure long-term stable operation of the pump. For ultra-high-pressure applications, shorten the maintenance cycle appropriately.
7. Pressure Relief Procedure: Always follow the correct pressure relief procedure before any maintenance or disassembly to prevent personal injury and equipment damage from residual ultra-high pressure.