DG5V-7 Eaton Vickers Directional Valve 300 L/min 350 Bar

Product Overview

The DG5V-7 series solenoid controlled pilot operated directional valve (including models DG5V-7-3C-7-T-P7-H-80-JA289, DG5V-7-31C-M-U1-H-7-54, and DG5V-H8-3C-T-P2-T84-JA137) is manufactured to original Eaton Vickers technical standards. The DG5V-7 belongs to size 07 (NG16 / CETOP 7 / ISO 4401-07 / NFPA D07), while the DG5V-H8 belongs to size 08 (NG25 / CETOP 8 / ISO 4401-08 / NFPA D08). Both series feature pilot-operated two-stage design with high-performance DG4V-3 series solenoid pilot valves. The main spool is positioned by pilot pressure, used for controlling the starting, stopping, and direction of fluid flow in high-flow hydraulic systems.

The DG5V-7-3C-7-T-P7-H-80-JA289 features spool type 3C (all ports closed in center), spring centered, and 24 VDC wet armature solenoids. The DG5V-7 series delivers maximum main stage flow of 300 L/min (80 USgpm) at 350 bar (5000 psi). The DG5V-H8 series achieves maximum flow of 700 L/min (185 USgpm), with a pilot valve tank line pressure rating of 210 bar (3000 psi). The DG5V-7-31C-M-U1-H-7-54 features spool type 31C with 24 VDC solenoids, suitable for hydraulic circuits requiring specific center conditions.

This product is dimensionally and functionally identical to the original Eaton Vickers DG5V-7/DG5V-H8 series valves, offering true drop-in interchangeability for direct replacement of same-specification OEM valves. The DG3V and DG5V are 100% interchangeable with previous H8 design 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-7-3C-7-T-P7-H-80-JA289 / DG5V-7-31C-M-U1-H-7-54 / DG5V-H8-3C-T-P2-T84-JA137

• Product Series: DG5V-7 (Size 07 / NG16 / CETOP 7 / ISO 4401-07 / NFPA D07); DG5V-H8 (Size 08 / NG25 / CETOP 8 / ISO 4401-08 / NFPA D08)

• Design Series: 40 series (DG5V-7)

• Spool Type: 3C (All ports closed in center) / 31C (P blocked, A & B to tank in center)

• Spring Arrangement: C (Spring centered)

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

• Mounting Pattern: DG5V-7 per ISO 4401-07; DG5V-H8 per ISO 4401-08

• Installation Position: Any

Hydraulic Parameters (DG5V-7 Series)

• Maximum Flow Rate: 300 L/min (80 USgpm)

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5000 psi)

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

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

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

• Filtration: ISO 4406 20/18/15

• Recommended Viscosity Range: 15 – 128 cSt

Hydraulic Parameters (DG5V-H8 Series)

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

• Maximum Operating Pressure: 350 bar (5000 psi)

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

• 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

Electrical Parameters

• Supply Voltage: 24 VDC (standard)

• Power Consumption: 30 W (DC solenoid)

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

• Protection Class: IP65 (with standard connector)

• Molded-in surge suppressor/diodes available

• LED indicator lights available

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: Buna-N (standard) / F3 Viton (optional, for phosphate ester fluids)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• DG5V-7: approx. 9.1 kg

• DG5V-H8: approx. 20.04 kg (single solenoid) / 20.64 kg (double solenoid)

Key Technical Advantages

1. High Flow Capacity with Low Pressure Drop
The DG5V-7 series delivers up to 300 L/min flow capacity in size 07 at 350 bar (5000 psi). The DG5V-H8 series achieves maximum flow of 700 L/min (185 USgpm) in size 08. Both series feature solid cast bodies and cored passages for maximum strength and minimal pressure drop, effectively reducing system energy loss and improving hydraulic system efficiency. Low headloss minimizes power wastage.

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 standard performance pilot valves. 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. Precision Spool Machining with 18 Spool Options
The control spool is precision-ground from carburized steel with micron-level clearance control. The DG*V-7 series offers up to 18 different spool types including 3C (all ports closed in center), 31C (P blocked, A & B to tank), and various other center conditions. All spools have been designed to provide good low shock, fast response characteristics.

4. Low Shock Characteristics and Long Life Design
All spools have been designed to provide good low shock, fast response characteristics which can be enhanced by optional stroke and/or pilot choke adjustments. Solenoid coils can be changed without disturbing the hydraulic envelope, significantly reducing downtime and maintenance costs. The DG5V-7/H8 series has been endurance tested to ensure high reliability in high pressure and flow applications.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every DG5V-7/DG5V-H8 series 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

• Wind Power Generation: Pitch control system hydraulic directional control

Expert Maintenance Tips

Installation Guidelines

1. The DG5V-7/DG5V-H8 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 (49-59 Nm for DG5V-7). The mounting surface conforms to ISO 4401-07/08 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 20/18/15 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%. Power consumption is 30 W (DC solenoid); 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. F3 Viton seals are available for phosphate ester hydraulic fluid applications. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.