DG5V-8-H-8C-E-VM-U-D-10 Eaton Vickers Directional Valve 700 L/min 350 Bar

Product Overview

The DG5V-8-H-8C-E-VM-U-D-10 and DG5V-8-H-2A-E-M-U-H-10 series pilot-operated directional valves are manufactured to original Eaton Vickers technical standards. Belonging to the DG5V-8 series with size 08 (NG25 / CETOP 8 / ISO 4401-08 / NFPA D08), these valves are high-performance two-stage solenoid-controlled pilot-operated directional control valves. Featuring a pilot-operated two-stage design with a high-performance DG4V-3-60 solenoid pilot valve, the main spool is positioned by pilot pressure. The mounting surface conforms to ISO 4401-08 standards, used for controlling the starting, stopping, and direction of fluid flow in high-flow hydraulic systems.

The DG5V-8-H-8C-E-VM-U-D-10 features spool type 8C (tandem center, P→T, open crossover), spring centered, equipped with 24 VDC wet-pin solenoids (D coil), internal pilot supply, external pilot drain (E type), VM pilot choke adjustment, and 10 design. The DG5V-8-H-2A-E-M-U-H-10 features spool type 2A (closed center, spring offset end to end), equipped with 24 VDC wet-pin solenoids (H coil). Both series deliver maximum main stage flow of 700 L/min (185 USgpm) at 350 bar (5075 psi), with a pilot valve tank line pressure rating of 210 bar (3000 psi).

These products are dimensionally and functionally identical to the original Eaton Vickers DG5V-8 series valves. The DG3V and DG5V are 100% interchangeable with previous H8 design valves, enabling direct drop-in replacement without modifying piping or control programs. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization.

Technical Specifications 

General Specifications

• Model: DG5V-8-H-8C-E-VM-U-D-10 / DG5V-8-H-2A-E-M-U-H-10

• Product Series: DG5V-8 (Size 08 / NG25 / CETOP 8 / ISO 4401-08 / NFPA D08)

• Design Number: 10 Design

• Spool Type: 8C (Tandem center, P→T, open crossover, spring centered) / 2A (Closed center, spring offset end to end)

• Pilot Valve Type: H type (DG4V-3-60 high-performance pilot valve)

• Design: Solenoid controlled, pilot operated, two-stage directional control valve

• Mounting Pattern: ISO 4401-08 / CETOP 8 / NFPA D08

• Installation Position: Spring centered/offset: unrestricted; Detent: horizontal

Hydraulic Parameters

• Maximum Flow Rate: 700 L/min (185 USgpm)

• Maximum Operating Pressure (Ports P/A/B/T): 350 bar (5075 psi)

• Pilot Valve Tank Line Pressure Rating: 210 bar (3000 psi)

• Hydraulic Fluid: Mineral-based hydraulic oil, water glycol, water-oil emulsion

• Standard Seals: Nitrile (NBR) for petroleum, water-glycol and water-oil emulsion fluids

• Optional Seals: F3 (Viton, for phosphate ester and most industrial fluids); F6 (Nitrile, for water-glycol and water-oil emulsion)

• Fluid Temperature Range: -20°C to +80°C

• Filtration: ISO 4406 20/18/15

• Main Stage Return: Spring centered (8C) / Spring offset (2A)

Pilot Control Parameters

• Pilot Valve Model: DG4V-3-60 high-performance pilot valve

• Pilot Valve Size: 03 (NG6 / CETOP 3)

• Pilot Valve Maximum Flow: 80 L/min

• Pilot Supply: Internal

• Pilot Drain: External (E type)

• Pilot Choke: VM type (increases mainstage spool shift time, lowers large flow transients)

• Minimum Pilot Pressure (at 350 bar working pressure): Refer to catalog p. 15 for minimum pilot pressure requirements

Electrical Parameters

• Supply Voltage: DG5V-8-H-8C-E-VM-U-D-10: 24 VDC (D coil); DG5V-8-H-2A-E-M-U-H-10: 24 VDC (H coil)

• Standard Voltage/Frequency Range: 115V AC, 60 Hz

• Solenoid Type: Wet armature solenoid with interchangeable coil

• Electrical Connector: ISO 4400 (DIN 43650) standard connector (U type)

• Protection Class: IP65 (with standard connector)

• Manual Override: Plain manual override standard; waterproof and lockable optional

• Coil Insulation: Class H

Materials & Construction

• Valve Body: Solid cast body with cored passages for maximum strength and minimal pressure drop

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard) / F3 / F6 (optional)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Weight: approx. 8.5 kg

Key Technical Advantages

1. High Flow Capacity with Low Pressure Drop
The DG5V-8-H-8C-E-VM-U-D-10 and DG5V-8-H-2A-E-M-U-H-10 deliver up to 700 L/min (185 USgpm) flow capacity in size 08 at 350 bar (5075 psi) maximum operating pressure. Both series feature solid cast bodies and cored passages for maximum strength and minimal pressure drop, effectively reducing system energy loss. The main stage spool features spring centered (8C) or spring offset (2A) design, ensuring reliable spool return to a safe position upon solenoid de-energization.

2. High-Performance Pilot Valve with High Tank Line Pressure Rating
The valve employs the DG4V-3-60 high-performance pilot valve with a tank line pressure rating of 210 bar (3000 psi), significantly higher than the standard performance pilot valve rating of 100 bar (1450 psi). High force solenoids and centering springs assure consistent shifting through a wide range of pressure and silting extremes. The VM type pilot choke adjustment increases mainstage spool shift time, effectively lowering large flow transients in the circuit for smooth shifting.

3. Multiple Spool Options for Flexible Circuit Design
The DG5V-8 series offers multiple interchangeable spool functions: 8C (tandem center, P→T, open crossover), 2A (closed center, spring offset), 2C (closed center), 0 (open center all ports), 1 (open center P to A & T blocked), 3 (open center P to B blocked, A to T), 4 (tandem center P to T closed crossover), 6 (closed center P blocked, A & B to T), 7 (open center P to A & B, T blocked), and others. The multiple function combinations meet diverse hydraulic circuit design requirements.

4. Durability-Tested High Reliability Design
The valve has been endurance tested to 10 million cycles and fatigue tested without failure to ensure the highest reliability in high flow and pressure applications. High force solenoids and centering springs assure consistent shifting through a wide range of pressure and silting extremes. The DG3V and DG5V are 100% interchangeable with previous H8 design valves. Electrical options including coil types, connections, and wiring housings allow full compatibility and reliable performance in any system application.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Eaton Vickers valve. The DG3V and DG5V are 100% interchangeable with previous H8 design valves, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• Die Casting Machines: High-flow directional control for shot systems, suitable for UBE die casting machines and similar large equipment

• Injection Molding Machines: Directional control for large injection molding machine mold closing, injection, and ejector high-flow hydraulic circuits

• Hydraulic Presses: Main cylinder directional control and fast/slow speed switching for medium-to-large tonnage presses

• Metallurgical Equipment: High-flow directional control for continuous casting machines and rolling mill auxiliary hydraulic systems

• Construction Machinery: Main hydraulic circuit directional control for excavators and cranes

• Marine Hydraulics: Steering gear control and deck machinery high-flow directional control

• Testing Equipment: Hydraulic loading direction control for large material testing machines

• Concrete Pump Trucks: High-flow directional control for pumping system main circuits

Expert Maintenance Tips

Installation Guidelines

1. For the DG5V-8 series, spring-centered and spring-offset models have unrestricted mounting positions; detent models (no-spring mechanical detent) must be installed with the valve spool in the horizontal position for good machine reliability. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-08 for direct installation on standard subplates or manifolds.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Recommended cleaning methods are sandblasting, wire brushing and pickling. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.

3. Y-Port (Pilot Drain) Management: This valve uses external pilot drain. The Y-port must be piped directly to the tank; back pressure cannot be tolerated at this valve port.

4. Electrical Grounding: On solenoid operated directional valves, ensure an electrical ground is connected to the valve to prevent the possibility of a shock hazard if a coil develops a short circuit to the frame. Electrical connections must use a U type connector conforming to ISO 4400/DIN 43650 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 20/18/15 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits. Ensure the entire system is flushed to remove paint, metal chips, welding shot, etc..

2. Pilot Valve Maintenance: Periodically inspect the DG4V-3-60 pilot stage for proper operation and stable pilot pressure. Pilot valve tank line pressure must not exceed 210 bar. If main stage shifting is abnormal, first check the pilot valve filter for blockage. If pilot pressure exceeds 210 bar, a reducer module is required.

3. Solenoid Electrical Inspection: Periodically inspect connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Plain manual overrides are standard; waterproof and lockable manual overrides are optional.

4. Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels. The VM pilot choke can be adjusted by backing off lock-nuts and turning adjusting screws inward to decrease rate of spool travel and outward to increase spool travel rate.

5. Seal Replacement: Standard NBR seals are suitable for petroleum, water-glycol and water-oil emulsion type fluids. For phosphate ester fluids, F1 or F3 seals are required; for water-glycol, F6 seals are available. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.