DG4V-3 Eaton Vickers Solenoid Directional Valve 80 L/min 350 Bar

Product Overview

The DG4V-3/DG5V-8 series solenoid directional control valves (including models DG4V-3-0BL-M-P7-H-7-5H, DG4V-3S-0BL-M-U-B5-60, and DG5V-8-H-2C-M-U-H19) are manufactured to original Eaton Vickers technical standards. The series covers two product families: size 03 (NG6 / CETOP 3 / ISO 4401-03) direct-acting solenoid directional valves and size 08 (NG8 / CETOP 8 / ISO 4401-08) pilot-operated solenoid directional valves. The DG4V-3 series uses wet armature solenoids to directly shift the spool, while the DG5V-8 series employs a pilot-operated two-stage control structure. Both are used for directing and stopping flow at any point in a hydraulic system, providing precise directional control of hydraulic actuators.

The DG4V-3 series is available in two performance levels: the high-performance DG4V-3 with maximum flow of 80 L/min (21 USgpm), and the standard-performance DG4V-3S with maximum flow of 40 L/min (10.5 USgpm), both rated at 350 bar (5075 psi) on ports P/A/B. The DG5V-8 series is a pilot-operated two-stage valve featuring the high-performance DG4V-3-60 pilot valve, with main stage maximum flow of 700 L/min (185 USgpm) at 350 bar (5000 psi). The “H” pilot valve version features a tank port rating of 210 bar (3000 psi), ideal for mobile equipment applications with high return line back pressure.

This product is dimensionally and functionally identical to the original Eaton Vickers valves, 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: DG4V-3-0BL-M-P7-H-7-5H / DG4V-3S-0BL-M-U-B5-60 / DG5V-8-H-2C-M-U-H19

• Product Series: DG4V-3 / DG4V-3S (Size 03 / NG6 / CETOP 3 / ISO 4401-03); DG5V-8 (Size 08 / NG8 / CETOP 8 / ISO 4401-08)

• Design Series: 60 Design

• Spool Type: 0BL (Spring offset, left hand build) / 2C (All ports closed in center)

• Design: DG4V-3 direct-acting subplate mounting solenoid valve; DG5V-8 pilot-operated two-stage solenoid valve

• Mounting Pattern: DG4V-3 conforms to ISO 4401-03 (CETOP 3 / NFPA D03); DG5V-8 conforms to ISO 4401-08 (CETOP 8 / NFPA D08)

• Installation Position: Any

Hydraulic Parameters (DG4V-3 High Performance)

• 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 (3045 psi)

• Rated Pressure: 315 bar

• Hydraulic Fluid: Mineral-based and water-containing hydraulic fluids

• Viscosity Range: Recommended 20 – 380 mm²/s (cSt)

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

• Filtration: ISO 4406 19/17/14

• Duty Cycle: Continuous (ED = 100%)

• Response Time (DC solenoid): Energizing 25-40 ms / De-energizing 20-30 ms

Hydraulic Parameters (DG4V-3S Standard Performance)

• Maximum Flow Rate: 40 L/min (10.5 USgpm)

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

• Maximum Tank Port Pressure (Port T): 210 bar (3045 psi)

• Weight: approx. 1.5 kg

Hydraulic Parameters (DG5V-8 Pilot Operated)

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

• Maximum Pressure: 350 bar (5000 psi)

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

• Pilot Stage Tank Port Rating: 210 bar (3000 psi)

• Control: Solenoid pilot operated

• Main Stage: Spring centered

Electrical Parameters

• Supply Voltage: DG4V-3-0BL-M-P7-H-7-5H: 24 VDC (H7); DG4V-3S-0BL-M-U-B5-60: 110/120 VAC (B5)

• Solenoid Type: Wet armature solenoid with interchangeable coil

• Coil Winding Insulation: Class H

• Electrical Connector: ISO 4400 / DIN 43650

• Protection Class: IP65 (with standard connector)

• Reverse Polarity Protection: Yes

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground with milled metering notches

• Seals: FKM (Viton) as standard

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• DG4V-3: approx. 2.3 kg

• DG4V-3S: approx. 1.5 kg

• DG5V-8: approx. 10.4 kg

Key Technical Advantages

1. Wet Armature Solenoid Design for High Reliability
The DG4V-3/DG5V-8 series employs a wet armature solenoid design where the armature operates in hydraulic fluid, effectively reducing shifting impact noise and wear. Solenoid coils can be changed quickly and easily without leakage from the hydraulic system, significantly reducing downtime and maintenance costs. The product has been tested over 20 million cycles, demonstrating proven fatigue life and endurance. The DG5V-8 series has been endurance tested to 10 million cycles and fatigue tested without failure to ensure the highest reliability in high flow and pressure applications.

2. High Power-to-Weight Ratio with Compact System Design
The DG4V-3 series is designed to provide efficient control of greater hydraulic powers without increasing solenoid power consumption. Higher power/weight and power/size ratios result in cost and space savings. When used with Vickers SystemStak™ valves and multi-port subplates, compact and cost-effective system designs are achieved. Multi-fluid capability eliminates the need to change seals.

3. Precision Spool Machining with Milled Metering Notches
The control spool is precision-ground from carburized steel. Milled metering notches on the spool enable precise control of flow rate change as the spool is shifted. Combined with improved manufacture of spool and bores, internal leakage is reduced, minimizing power losses and increasing system efficiency. The DG5V-8 series features solid cast bodies and cored passages for maximum strength and minimal pressure drop.

4. Pilot-Operated Two-Stage Control with High Flow Capacity
The DG5V-8 series employs a pilot-operated two-stage control structure with a high-performance DG4V-3-60 solenoid pilot valve. The main stage spool is positioned by pilot pressure, achieving flow capacity up to 700 L/min. The main stage features spring-centered design, ensuring safe spool return upon pilot pressure failure. The series offers “mini-system” capability with a wide variety of spool and spring arrangements, stroke and pilot choke adjustments, integral check valves, and port orifices.

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 valves, enabling direct drop-in replacement without modifying piping or control programs. The DG3V and DG5V are 100% interchangeable with previous H8 design valves.

Application Areas

• Injection Molding Machines: Mold opening/closing direction control, ejector system control

• Hydraulic Presses: Main cylinder directional control, fast/slow speed switching

• Machine Tools: CNC hydraulic clamping systems, tool changer control

• Construction Machinery: Excavators, loaders hydraulic circuits (DG4V-3S and DG5V-8-H models)

• Metallurgical Equipment: Continuous casting machines, rolling mill auxiliary directional control

• Marine Hydraulics: Steering gear control, deck machinery hydraulic systems

• Testing Equipment: Material testing machine hydraulic loading direction control

• Wind Power Generation: Pitch control system hydraulic directional control

Expert Maintenance Tips

Installation Guidelines

1. The DG4V-3/DG5V-8 series 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.

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. 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. Solenoid Electrical Inspection: Periodically inspect the connector 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.

3. 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.

4. Seal Replacement: Standard FKM (Viton) seals provide multi-fluid compatibility without the need to change seals. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.

5. Pilot Valve Maintenance (DG5V-8 Series) : Periodically inspect the DG4V-3-60 pilot stage for proper operation and stable pilot pressure. Pilot stage tank port back pressure must not exceed 210 bar. If main stage shifting is abnormal, first check the pilot valve filter for blockage.