DG5V-8-H-2C Eaton Vickers Directional Valve 700 L/min 350 Bar

Product Overview

The DG5V-8-H-2C-M-U-H-10 series pilot-operated directional valve is manufactured to original Eaton Vickers technical standards. Belonging to the DG5V-8 series with size 08 (NG25 / CETOP 8 / ISO 4401-08 / NFPA D08), this valve is a high-performance two-stage solenoid-controlled pilot-operated directional control valve. Featuring a pilot-operated two-stage design with a high-performance DG4V-3-60 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.

This model features spool type 2C (all ports closed in center), spring centered, internal pilot supply, external pilot drain, and 24 VDC supply voltage. The main stage maximum flow is 700 L/min (185 USgpm) with maximum operating pressure of 350 bar (5075 psi). The pilot valve tank line pressure rating is 210 bar (3000 psi). The valve features solid cast body and cored passages for maximum strength and minimal pressure drop.

This product is dimensionally and functionally identical to the original Eaton Vickers DG5V-8 series valve, offering true drop-in interchangeability for direct replacement of same-specification OEM valves. 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-2C-M-U-H-10

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

• Design Series: 10 Design

• Spool Type: 2C (All ports closed in center)

• Spring Arrangement: C (Spring centered)

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

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

• Installation Position: Any

Hydraulic Parameters

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

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

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

• Hydraulic Fluid: Mineral-based hydraulic oil

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

• Filtration: ISO 4406 19/17/14

• Pilot Supply: Internal

• Pilot Drain: External

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

• Pilot Valve Actuation: Wet armature solenoid

• Pilot Valve Coil Insulation: Class H

Electrical Parameters

• Supply Voltage: 24 VDC (H10)

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

• Protection Class: IP65 (with standard connector)

• Molded-in surge suppressor/diodes available

• Response Time: approx. 25 ms (energizing) / approx. 30 ms (de-energizing)

Materials & Construction

• Valve Body: High-strength cast iron, solid cast body with cored passages

• Control Spool: Carburized steel, precision ground

• Seals: Buna-N (standard)

• 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-2C-M-U-H-10 features solid cast bodies and cored passages for maximum strength and minimal pressure drop. The main stage maximum flow is 700 L/min (185 USgpm) at 350 bar (5075 psi), delivering exceptional flow capacity in size 08. The valve serves as a control valve package offering directional control, pilot pressure reducers, pilot chokes, and main stage stroke adjustment to control the flow in high-flow hydraulic systems.

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 (S type) pilot valve rating of 100 bar (1450 psi). This characteristic makes it particularly suitable for industrial hydraulic systems with high return line back pressure. High force solenoids and centering springs assure consistent shifting through a wide range of pressure and silting extremes.

3. 2C Spool All-Ports-Closed Center with Flexible Spring Arrangements
The 2C spool provides all-ports-closed center condition (P/A/B/T all blocked), suitable for hydraulic circuits requiring pressure holding or locking functions. Spring centered design ensures the main spool automatically returns to the central position upon de-energization, ensuring a safe system state. The DG5V-8 series offers a wide variety of spool and spring arrangements including spring offset, spring centered, pressure centered, and no-spring detented, meeting 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. Electrical options including coil types, connections, and wiring housings allow full compatibility and reliable performance in any system application. The DG3V and DG5V are 100% interchangeable with previous H8 design valves.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every DG5V-8-H-2C-M-U-H-10 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, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• 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

• Die Casting Machines: High-flow directional control for shot systems

• 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

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

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

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

Expert Maintenance Tips

Installation Guidelines

1. The DG5V-8-H-2C-M-U-H-10 can be mounted in any position. 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. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.

3. Pilot Drain Line Management: This valve uses external pilot drain. The pilot drain line must return independently to the reservoir with back pressure not exceeding 210 bar (3000 psi). The pilot drain line must not share a common return with other high-pressure circuits.

4. Electrical connections must use connectors 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 19/17/14 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

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.

3. Solenoid Electrical Inspection: Periodically inspect solenoid connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Coil insulation is Class H; monitor for abnormal temperature rise.

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.

5. Seal Replacement: Standard Buna-N seals. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours. For high-temperature applications, reduce the replacement interval.