Vickers DG5V Series Electro-Hydraulic Valve | DG5V-7 DG5V-8

The DG5V Series electro-hydraulic directional valves by Chengyuan Hydraulic are high-performance control units designed for high-flow, high-pressure industrial hydraulic systems. This series fully benchmarks the Vickers (Eaton) standards, specifically reproducing the DG5V-7 (Size 07/NG16) and DG5V-8 (Size 08/NG25) specifications, including complex configurations like the DG5V-7-8C-E-T-M-U1-H-7-52-S.

As a two-stage valve, the DG5V utilizes a small solenoid pilot valve (DG4V) to generate hydraulic force that shifts the main stage spool. This architecture allows the valve to handle pressures up to 350 bar and flows that exceed the capacity of direct-acting solenoids. Chengyuan ensures 100% original-place interchangeability regarding mounting interfaces (ISO 4401), pilot circuitry, and control response. Every unit undergoes 100% simulated full-load dynamic testing to ensure zero lag and minimal shock during high-frequency operation.

Technical Specifications 

• Compatible Brand: Vickers (Eaton) DG5V Series

• Core Models: DG5V-7 (NG16), DG5V-8 (NG25), DG5V-10 (NG32)

• Max Operating Pressure (Ports P, A, B): 350 bar (5000 PSI)

• Max Flow Capacity:

  • DG5V-7: Up to 300 L/min

  • DG5V-8: Up to 700 L/min

• Spool Function: 8C (3-position 4-way, closed center; multiple spool types available)

• Pilot Control: E-Internal Pressure / Unmarked-External Pressure

• Pilot Drain: T-Internal Drain / Unmarked-External Drain

• Electrical Connection: U1-ISO 4400 (DIN 43650) Connector

• Standard Voltage: H-24V DC (Other voltages optional)

• Response Time: 20ms – 150ms (Depending on pilot flow and system pressure)

Key Technical Advantages:

• Two-Stage Power Multiplier: By amplifying a small electrical signal through the pilot stage (DG4V-3), the valve generates the massive force required to shift a large spool. This allows the DG5V to manage flows up to 700 L/min with much higher power limits than direct-acting valves.

• Adjustable Shifting Damping: The main stage can be equipped with stroke adjusters or pilot chokes. By precisely controlling the speed of the main spool, “water hammer” effects caused by shifting large inertia loads are eliminated, protecting the entire system.

• Integrated Pilot Flexibility: Supports various combinations of pilot supply (Internal/External) and drain (Internal/External). Whether your circuit requires constant pilot pressure or a simplified piping layout, the DG5V can be field-converted via internal plugs.

• Hardened Spool-in-Cast-Iron Technology: The valve body is forged from high-strength cast iron with ultra-precise internal bores. Spools are vacuum heat-treated for maximum hardness and precision-honed to maintain micron-level clearances, ensuring exceptionally low internal leakage even at 350 bar.

Application Areas:

• Heavy Presses & Shearing Machines: Controlling high-flow switching and pressure maintenance for main cylinders.

• Metallurgical Equipment: Reliable operation of ladle turrets or pusher drives in high-heat and dusty environments.

• Large Injection Molding Machines: High-speed power switching for injection and clamping units.

Expert Maintenance Tips:

• Pilot Pressure Range Warning: Ensure pilot pressure is maintained between 15 bar and 210 bar. Low pressure will cause incomplete spool shifting, while excessive pressure can damage the pilot valve components.

• Critical Filtration Interval: Due to the narrow orifices in the pilot stage, fluid cleanliness must meet or exceed ISO 4406 18/16/13. We recommend an additional fine filter in the pilot supply line to prevent spool jamming.

• Drain Port Back-Pressure: For external drain models, ensure the drain port is connected directly to the tank. Excessive back-pressure on the drain will interfere with the pilot spool’s return, leading to sluggish response or dangerous control loss.