YUKEN A16, A22, A37, A56 Piston Pumps

Overview

The YUKEN A Series (A16/A22/A37/A56) represents a versatile lineup of variable displacement piston pumps, engineered to cover light to medium-duty industrial applications with precise fluid power control. Leveraging YUKEN’s 60+ years of hydraulic expertise, this quartet of models features displacement options from 16 to 56 cm³/rev, maximum working pressure up to 21 MPa, and energy-efficient variable technology. Designed for seamless integration into automated production lines and industrial machinery, the series balances compact design, low noise operation, and robust durability—making it a preferred choice across manufacturing, metallurgy, and precision engineering sectors.

Core Technical Specifications

1. Displacement & Flow Performance

• Flow Regulation: Stepless adjustment via swashplate angle control for on-demand oil supply, eliminating throttling losses .
• Precision Control: Flow stability ±1% at rated operating conditions, ensuring consistent machinery performance.

2. Pressure & Speed Capabilities

• Maximum Working Pressure: Up to 21 MPa (pressure range codes: B=1.2～7 MPa / C=1.2～16 MPa / H=1.2～21 MPa)
• Adjustable Pressure Range: 1.2～21 MPa (model-independent, adaptable to dynamic 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)

3. Efficiency & Energy Saving

• Volumetric Efficiency: ≥98% (tested at 16 MPa, 1800 rpm for all models)
• Total Efficiency: ≥90% (15%～20% energy savings vs. 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: ≤57.3 dB(A) (A16/A56), ≤58.5 dB(A) (A22), ≤60.8 dB(A) (A37) – industry-leading for medium-displacement pumps
• Heat Generation: Oil temperature rise ≤35℃ under continuous operation (25% 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 ≤0.4 seconds
• Electromagnetic Dual-Pressure Control (Optional Type 02): DC24V signal-driven high-low pressure switching (PL/PH) for automated production lines
• Electro-Hydraulic Proportional Control (Optional): Closed-loop pressure/flow regulation with ±0.3 MPa precision, ideal for high-precision machinery

2. Standard Model Configurations

• A16-F-R-01-H-S-K-32 (flange mounting, clockwise rotation, 21 MPa, side port, flat key shaft)
• A22-L-R-01-C-S-K-32 (base mounting, clockwise rotation, 16 MPa, side port, flat key shaft)
• A37-F-R-01-B-S-K-32 (flange mounting, clockwise rotation, 7 MPa, side port, flat key shaft)
• A56-F-R-01-H-S-K-32 (flange mounting, clockwise rotation, 21 MPa, side port, flat key shaft)

3. Installation Flexibility

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

Application Fields

The A Series models excel in targeted industrial scenarios:

• A16: Precision applications – small injection molding machines, electronic component assembly equipment, hydraulic test benches
• A22: Light to medium-duty machinery – packaging equipment, small hydraulic presses, shoe-making machines
• A37: Medium-duty operations – plastic extruders, die-casting equipment, automated assembly lines, marine engineering
• A56: Heavy-duty applications – medium-sized hydraulic presses, forging machinery, metallurgical equipment, environmental engineering

Reliability & Maintenance

1. Durability Features

• Core Components: Precision-machined plunger-cylinder assembly with minimal clearance, 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 vibration resistance, suitable for continuous operation in harsh industrial environments

2. Maintenance Requirements

• Hydraulic Oil: ISO VG46 anti-wear hydraulic oil (NAS Class 9 or higher); recommended viscosity 30～50 cSt
• Oil Change Interval: Every 2000 hours (or 3 months for severe operating conditions)
• Filter Maintenance: Independent ≤5μm filtration circuit for control oil path, cleaning required every 400 hours
• Startup Procedure: Prime pump with oil before initial operation; perform low-pressure test run for 10 minutes to release air

Key Advantages

• Displacement Gradient: 16～56 cm³/rev coverage adapts to precision tasks and heavy-load operations alike
• Exceptional Efficiency: ≥98% volumetric efficiency reduces energy consumption and heat generation
• Flexible Integration: Multiple mounting/rotation options and control modes for seamless system adaptation
• Low Noise Operation: Industry-leading noise levels enhance workplace comfort and equipment compatibility
• Robust Reliability: Reinforced components and strict quality control ensure long service life with minimal downtime
• Cost-Effective: Energy savings and low maintenance requirements reduce total operational costs