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

Product Overview

The DG5V-8-H-2C-M-U-H19 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 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-2C-M-U-H19 features spool type 2C (closed center, P/A/B/T all blocked), double solenoid spring centered, internal pilot supply, external pilot drain (T type), equipped with 24 VDC wet-pin solenoids (H19 coil, high-performance H type pilot valve). Maximum main stage flow is 700 L/min (185 USgpm) at 350 bar (5075 psi), with a pilot valve tank line pressure rating of 210 bar (3000 psi).

The accompanying DG4V-3-6C-M-U-H7-69-EN124 pilot stage solenoid valve belongs to the DG4V-3 series with size 03 (NG6 / CETOP 3 / ISO 4401-03), featuring spool type 6C (tandem center, P→T, A/B blocked), equipped with 24 VDC wet-pin solenoids, indicator light connector (H7), maximum flow of 80 L/min (21 USgpm), maximum operating pressure of 350 bar (5075 psi), tank port rating of 210 bar (3000 psi), and Viton (FKM) seal material.

This combination is dimensionally and functionally identical to the original Eaton Vickers DG5V-8 and DG4V-3 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-2C-M-U-H19 / DG4V-3-6C-M-U-H7-69-EN124

• Product Series: DG5V-8 (Size 08 / NG25 / CETOP 8 / ISO 4401-08 / NFPA D08); DG4V-3 (Size 03 / NG6 / CETOP 3 / ISO 4401-03 / NFPA D03)

• Design: DG5V-8 pilot-operated two-stage solenoid valve; DG4V-3 direct-acting solenoid valve (used as pilot stage)

• Ways/Positions: 4-way, 3-position, spring centered

• Mounting Pattern: DG5V-8 per ISO 4401-08 / CETOP 8; DG4V-3 per ISO 4401-03 / CETOP 3

• Installation Position: Any (spring-centered types)

Hydraulic Parameters (DG5V-8-H-2C Main Stage)

• 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)

• Optional Seals: F3 (Viton, for phosphate ester 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 (2C)

• Endurance: Tested to 10 million cycles per NFPA fatigue specifications

Hydraulic Parameters (DG4V-3-6C-M-U-H7-69 Pilot Stage)

• Maximum Flow Rate: 80 L/min (21 USgpm)

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

• Maximum Tank Port Pressure (Port T): 210 bar (3000 psi)

• Spool Type: 6C (Tandem center, P→T, A/B blocked)

• Seal Material: Viton (FKM)

• Fluid Cleanliness: 19/17/14 micron

• Working Temperature Range: -20°C to +70°C

Electrical Parameters (DG5V-8-H-2C-M-U-H19)

• Supply Voltage: 24 VDC (H19 coil)

• 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

Electrical Parameters (DG4V-3-6C-M-U-H7-69-EN124)

• Supply Voltage: 24 VDC (H7)

• Power Consumption: 30 W

• Electrical Connector: ISO 4400 / DIN 43650 connector with indicator light (H7)

• Energizing Time: 45-28 ms

• Protection Class: IP65

• Manual Override: Plain design

Materials & Construction

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

• Control Spool: Carburized steel, precision ground

• Seals: DG5V-8 standard NBR; DG4V-3 standard Viton (FKM)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• DG5V-8-H-2C: approx. 8.5 kg

• DG4V-3-6C: approx. 2.2 kg

Key Technical Advantages

1. High Flow Capacity with Low Pressure Drop
The DG5V-8-H-2C-M-U-H19 delivers up to 700 L/min (185 USgpm) flow capacity in size 08 at 350 bar (5075 psi) maximum operating pressure. Solid cast bodies and cored passages provide maximum strength and minimal pressure drop, effectively reducing system energy loss. The main stage spool features spring-centered design, ensuring reliable spool return to the center position upon solenoid de-energization for a safe system state.

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 DG4V-3-6C pilot stage features a 6C tandem center spool with P→T open and A/B blocked, suitable for circuits requiring pump unloading in the center position.

3. Multiple Spool Options for Flexible Circuit Design
The DG5V-8 series offers multiple interchangeable spool functions: 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), 8 (tandem center P→T open crossover), 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. The DG3V and DG5V are 100% interchangeable with previous H8 design valves. The DG4V-3 pilot valve has been tested over 20 million cycles with proven fatigue life and endurance. 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 models have unrestricted mounting positions; detent models (no-spring mechanical detent) must be installed with the valve spool in the horizontal 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. 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. The DG4V-3 pilot valve requires fluid cleanliness of 19/17/14 micron. 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-3-6C 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. The DG4V-3-6C power consumption is 30 W with energizing time of 45-28 ms. Measure coil resistance and replace the coil if deviation exceeds ± 10%.

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: DG5V-8 standard NBR seals; DG4V-3 standard Viton (FKM) seals. For phosphate ester fluids, DG5V-8 requires F3 seals. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.