YUKEN A3H16, A3H37, A3H56 piston pumps

Overview

The YUKEN A3H Series represents a premium line of high-pressure variable piston pumps, encompassing three core models (A3H16, A3H37, A3H56) engineered for medium to heavy-duty industrial applications. Built on YUKEN’s 60+ years of hydraulic innovation, this series integrates robust structural design, advanced load-sensitive control, and precise flow regulation to deliver reliable fluid power solutions across diverse sectors. With displacement options ranging from 16 to 56 cm³/rev and maximum pressure up to 21 MPa, the A3H Series adapts seamlessly to light precision tasks and heavy-load operations alike, making it a versatile choice for automated production lines and industrial machinery.

Core Technical Specifications

1. Displacement & Flow Performance

• Flow Regulation: Stepless adjustment via swashplate angle control for on-demand oil supply, eliminating throttling losses.

2. Pressure & Speed Capabilities

• Maximum Working Pressure: Up to 21 MPa (varies by pressure range code: B=7 MPa / C=16 MPa / H=21 MPa)
• Adjustable Pressure Range: 1.5～21 MPa (model-independent, precise matching for diverse load cycles)
• Rated Speed: 1800 rpm
• Operating Speed Range: 600～3600 rpm (supports rapid actuation and low-speed pressure holding)
• Overload Capacity: Withstands 110% of maximum pressure for 5-minute cycles (enhanced structural integrity for intermittent heavy loads)

3. Efficiency & Energy Saving

• Volumetric Efficiency: ≥97.5% (tested at 16 MPa, 1800 rpm for all models)
• Total Efficiency: ≥89% (15%～20% energy savings compared to conventional fixed-displacement pumps)
• Variable Displacement Mechanism: Adaptive swashplate design optimizes power consumption in partial-load operations, reducing operational costs.

4. Noise & Temperature Control

• Noise Level: ≤58.2 dB(A) (A3H16), ≤60.8 dB(A) (A3H37), ≤63.5 dB(A) (A3H56) – industry-leading for medium-displacement pumps
• Heat Generation: Oil temperature rise ≤38℃ under continuous operation (22% lower than standard pumps), minimizing cooling system burden

Control Modes & Adaptability

1. Control Options

• Pressure Compensation Control (Type 01): Standard configuration with external pilot pressure signal (0.3～3.5 MPa) for stepless pressure adjustment, response time ≤0.5 seconds
• Electro-Hydraulic Proportional Load-Sensitive Control (Type 04): Optional advanced control for closed-loop pressure/flow regulation, ideal for automated production lines requiring high precision (±0.3 MPa)
• Electromagnetic Dual-Pressure Control (Optional Type 02): DC24V signal-driven high-low pressure switching (PL/PH) for flexible load adaptation

2. Standard Model Configurations

• A3H16-F-R-01-H-K-32393 (flange mounting, clockwise rotation, pressure compensation control, 21 MPa, flat key shaft)
• A3H37-L-L-04-C-K-10356 (base mounting, counterclockwise rotation, proportional control, 16 MPa, flat key shaft)
• A3H56-F-R-01-H-K-32366 (flange mounting, clockwise rotation, pressure compensation control, 21 MPa, flat key shaft)

3. Installation Flexibility

• Mounting Types: Flange (F) or base (L) installation to fit different mechanical structures
• Rotation Direction: Clockwise (R) as standard; counterclockwise (L) available on request
• Port Position: Side (S) interface as standard for convenient pipeline layout
• Shaft Extension: Flat key (K) design ensures stable power transmission in medium to high-torque applications

Application Fields

The A3H Series excels in diverse industrial scenarios, with model-specific optimizations:

• A3H16: Precision applications such as small injection molding machines, electronic component assembly equipment, and hydraulic test benches
• A3H37: Medium-duty machinery including die-casting equipment, plastic extruders, and automated assembly lines
• A3H56: Heavy-duty applications such as medium-sized hydraulic presses, forging machinery, and metallurgical equipment

Reliability & Maintenance

1. Durability Features

• Core Components: Precision-machined plunger-cylinder assembly with minimal clearance, enhancing wear resistance and ensuring service life exceeding 20,000 hours
• Sealing System: Fluororubber seals (operating temperature: -20～80℃) with leakage rate ≤0.5 mL/min
• Structural Design: Robust housing with reinforced swashplate mechanism for vibration resistance in high-speed operations

2. Maintenance Requirements

• Hydraulic Oil: ISO VG46 anti-wear hydraulic oil (NAS Class 9 or higher), replacement every 2000 hours
• Filter Maintenance: Independent ≤5μm filtration circuit for control oil path, cleaning required every 400 hours
• Routine Inspection: Aligns with YUKEN A Series maintenance standards – includes pressure calibration, seal inspection, and lubrication checks

Key Advantages

• Displacement Gradient: Three models cover 16～56 cm³/rev, adapting to diverse flow requirements from precision tasks to heavy-load operations
• Flexible Control: Multiple control options (01/02/04) for seamless integration into automated systems
• Robust Design: High-pressure resistance (up to 21 MPa) and overload capacity for reliable performance in harsh industrial environments
• Energy Efficiency: Variable displacement technology reduces operational costs and environmental impact
• Easy Installation: Multiple mounting and rotation options for convenient integration into existing machinery
• Low Noise & Heat: Industry-leading noise and temperature control improve workplace comfort and extend system lifespan