Product Overview

Key Advantages

• High Operating Pressure & Efficiency: Engineered for nominal pressures up to 350 bar and peak pressures up to 400 bar, offering volumetric and total efficiency across the speed range.
• Versatile & Fast Response Controls: Supports a broad choice of control modules, including DR (pressure control), DP (differential pressure control), HD (hydraulic control), and EO/ED (electro-proportional control) for integration into complex automated systems.
• Modular Through-Drive Capability: Standard through-drive options allow mounting of additional pumps (axial piston or gear pumps) up to 100 percent auxiliary torque transfer, enabling multi-circuit systems.
• Extended Service Life: Built with hydrodynamic bearings, optimized valve plates, and heavy-duty swashplate assemblies to minimize friction, lower noise, and extend maintenance intervals.
• Precise Dynamic Response: Provides low hysteresis, excellent repeatability, and fast reaction times essential for high-precision motion and pressure control loops.

Technical Specifications

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Configuration Options

Structural Options

Swashplate Design: Swiveling swashplate structure with visual or electronic angle position indicator.

Through-Drive Configurations: Standard flange connections (SAE A, B, C, D, E) for auxiliary pump mounting.

Control Options

DR / DRG: Constant pressure control with remote pressure regulation option.

LR: Power controller (constant power limiter).

HD: Hydraulic control, pressure dependent.

EO / ED: Electro-proportional displacement and pressure controls with digital driver interfaces.

HS / HS4: Servo-hydraulic control with feedback transducer for closed-loop dynamic systems.

Feedback Options

Mechanical angle position feedback link.

Integrated electronic stroke transducer (LVDT) for precise displacement monitoring.

Interface & Mounting Standard

Flange Mount: ISO 3019-2 or SAE 4-bolt mounting flange configurations.

Port Connections: High-pressure SAE flange connections (Code 61 and Code 62) for suction and pressure lines.

Electrical Configuration

Standard 24V DC solenoid coils for electro-hydraulic control valves.

M12 x 1 connector plugs or Hirschmann DIN connectors rated to IP65 / IP67 protection class.

Key Materials and Components

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• Pump Housing: High-strength ductile iron (GJS-400 / GJS-500) providing rigidity, vibration damping, and burst resistance under high-pressure cycling.
• Cylinder Block & Pistons: Hardened alloy steel pistons with nitrided brass/bronze alloy shoes running on a hardened steel swashplate for minimal friction and wear resistance.
• Control Valve Spools: Precision-ground, hardened bearing steel spools and sleeves ensuring minimal internal leakage and precise flow metering.
• Sealing System: Fluorocarbon rubber (FKM / Viton) shaft seals and O-rings configured as standard to handle high fluid temperatures and synthetic hydraulic fluids.
• Drive Shaft: High-tensile forged steel shaft available in splined or keyed options according to ISO and SAE specifications.

Packaging and Transport Protection

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• Individual Unit Packaging: Each pump is drained of testing oil, sealed with anti-rust protective fluid, and wrapped in heavy-duty VCI (Vapor Corrosion Inhibitor) moisture-barrier foil.
• Internal Protection: All hydraulic connection ports are sealed with heavy-duty thread plugs or sealed blanking flanges to prevent fluid leakage and dust contamination.
• Shock-Absorbing Structure: Custom-molded high-density foam casing surrounds the pump inside a heavy-duty corrugated or solid wooden outer box.
• Export Wooden Crate Packaging: For bulk orders or international transport, units are secured on ISPM-15 compliant heat-treated fumigation-free wooden pallets or crates, bound with steel or PET strapping.
• Moisture & Environmental Shielding: Desiccant packs are inserted inside each package, and external stretch wrapping ensures protection against maritime humidity and dust during storage and transit.

Applications

Metal Forming & Hydraulic Presses

• Function: Provides high-pressure main flow and precise tonnage pressure holding during deep drawing, forging, and stamping cycles.
• Benefit: Fast swiveling response reduces cycle times while high pressure capability ensures consistent workpiece forming quality.

Plastic Injection Molding Machines

• Function: Drives clamping cylinders and injection units with variable pressure and flow matching machine cycle demands.
• Benefit: Reduces energy consumption during holding pressure phases compared to fixed displacement pump configurations.

Heavy Steel Mill & Metallurgical Equipment

• Function: Powers hydraulic tilt tables, furnace doors, continuous casting rollers, and steel coil handling equipment under continuous high-temperature conditions.
• Benefit: Robust housing and high fluid temperature limits maintain performance in harsh environmental conditions.

Civil Engineering & Marine Deck Machinery

• Function: Provides reliable proportional flow control for winches, crane slewing drives, and offshore drilling pipe handling equipment.
• Benefit: Stable open-circuit response and versatile control options allow integration with radio or remote joystick controls.

Related Models

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FAQ

Q1: How do I correctly identify and confirm the exact model code for an A4VSO pump?

A: Check the metal nameplate attached to the pump housing. Key parameters to note are the series number (e.g., A4VSO), frame size (e.g., 180 or 250), control type designation (e.g., DR, LR, EO), direction of rotation (R or L), mounting flange code, and shaft type suffix.

Q2: What fluid filtration level is required to ensure long pump life?

A: The fluid cleanliness should be maintained at ISO 4406 Class 18/16/13 or better. We recommend using a main pressure line filter or return line filter with a nominal filtration rating of 10 microns (beta ratio 100).

Q3: Which type of hydraulic oil is recommended for standard operation?

A: Standard mineral-base hydraulic fluids complying with DIN 51524 (HLP or HVLP) with a viscosity between 16 and 36 mm2/s at operating temperature are recommended. For fire-resistant fluids or eco-friendly fluids, special seal materials and altered operating parameters may apply.

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