DG4V-3-7C-M-KU4-H-7-54-JA81 Eaton Vickers Directional Valve 350 bar

Product Overview

The DG4V series is a direct-operated solenoid directional control valve from Eaton Vickers (now Danfoss Power Solutions), representing one of the most widely used directional valve product lines in industrial hydraulics. The DG4V-3-7C-M-KU4-H-7-54-JA81 and DG4V-03-2C-M-U-H7-60-EN210 are typical NG6 models (CETOP D03 / ISO 4401-03) within this series, featuring subplate mounting.

DG4V-type directional valves are solenoid-actuated directional spool valves that control the start, stop, and direction of fluid flow. The directional valve consists of the housing, wet armature solenoids, control spool, and return springs. In the de-energized condition, the control spool is held in the central or initial position by the return springs. When energized, the wet armature solenoid acts via the plunger on the control spool, pushing it to the required end position. After de-energization, the return spring pushes the control spool back to its rest position.

The DG4V-3 series features an optimized damping orifice design that delivers a soft shift function, providing smoother actuator acceleration and deceleration control than conventional solenoid valves, minimizing hydraulic shock while improving system reliability and extending component life.

As a direct OEM-replacement solution, this valve maintains 100% mechanical and functional interchangeability with the original Eaton Vickers unit. Every valve undergoes rigorous simulation testing—including pressure cycling, thermal variation, and full-stroke endurance validation—to guarantee factory-grade performance. The valve is tested for fatigue life and endurance exceeding 20 million cycles, ensuring sustained machine productivity and high uptime. Ideal for industrial hydraulic systems demanding high reliability, fast response, and long service life.

Technical Specifications 

DG4V-3 Series General Specifications (NG6 / CETOP D03):

• Brand: Eaton Vickers (Danfoss Power Solutions)

• Valve Type: Direct operated solenoid directional spool valve

• Nominal Size: NG6 (CETOP D03 / NFPA D03)

• Mounting Interface: ISO 4401-03

• Mounting Type: Subplate mounting

• Spool Configuration: 4/3 or 4/2-way

• Max. Operating Pressure: 350 bar (5000 psi) on ports P, A, B

• Max. Tank Port Pressure: 210 bar (3045 psi)

• Max. Flow: 80 L/min (21 USgpm)

• Component Series: 60 Design Series (DG4V-3-60 Design)

• Control Type: Wet armature solenoid direct actuation

• Coil Voltage: 24V DC (H7 code)

• Power Consumption: 30 W

• Electrical Connection: U = DIN 43650 / ISO 4400 connector

• Protection Class: IP65

• Seal Material: Viton (Fluorocarbon) as standard

• Body Material: Cast iron

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

• Viscosity Range: 10–500 cSt

• Response Time – On: 25–40 ms

• Response Time – Off: 20–30 ms

• Weight: Approx. 2.3 kg

• Manual Override: M = with manual override (push-pin type)

Model-Specific Parameters:

• DG4V-3-7C-M-KU4-H-7-54-JA81:

  • Spool Type: 7C (spring offset, P & B closed, A to T, single solenoid)

  • Manual Override: M-type (with manual override)

  • Electrical Connection: KU4-type (special connector configuration)

  • Coil Voltage: H (24V DC)

  • Design Series: 54 Design

  • Special Code: JA81

• DG4V-03-2C-M-U-H7-60-EN210:

  • Spool Type: 2C (closed center, all ports blocked)

  • Manual Override: M-type (with manual override)

  • Electrical Connection: U-type (DIN 43650 / ISO 4400)

  • Coil Voltage: H7 (24V DC)

  • Design Series: 60 Design

  • Special Code: EN210 (mobile equipment configuration)

Key Technical Advantages

1. Wet Armature Solenoid Design – Long Service Life and High Reliability

The DG4V series features wet armature solenoids, with the armature fully immersed in pressure oil. This design effectively lubricates moving parts, reduces friction and wear, and significantly improves solenoid heat dissipation, extending solenoid service life. Solenoid coils can be changed quickly without opening the pressure-tight chamber, greatly simplifying maintenance.

2. Optimized Soft Shift Function – Reduced Hydraulic Shock

The DG4V-3 series features an optimized damping orifice design that delivers a soft shift function. Milled metering notches on the spool enable precise control of flow rate change during shifting, providing smoother actuator acceleration and deceleration control than conventional solenoid valves, minimizing hydraulic shock, improving system reliability, and extending component life.

3. Proven Fatigue Life and High Reliability

DG4V-3 series valves are tested for fatigue life and endurance exceeding 20 million cycles. NFPA fatigue rating of 350 bar (5075 psi) ensures sustained machine productivity and high uptime.

4. Direct-Operated Design – Fast Response with No Pilot Delay

The direct-operated structure, with solenoids directly actuating the spool, eliminates pilot stage requirements for fast response and reliable shifting. Response times of 25–40 ms (on) and 20–30 ms (off) provide excellent shifting response characteristics in small-to-medium flow applications.

5. Multiple Spool Symbols and Configurations – Versatile Control Options

The DG4V-3 series offers a wide range of standard spool symbols including 0, 2, 3, 6, 8, 31, 33. Different spool symbols correspond to different center positions and flow configurations, accommodating diverse application requirements from simple bidirectional actuator control to complex differential circuit applications.

6. Drop-In Interchangeability – Minimized Downtime and Retrofit Costs

The valve strictly adheres to Eaton Vickers’ original mounting dimensions and functional specifications, with ISO 4401-03 / CETOP 3 interface compliance. The DG4V-3 series is a direct equivalent replacement for Rexroth 4WE6 and Yuken DSG-01 series. Whether for new system design or legacy system upgrades, this valve offers 100% mechanical and electrical interchangeability with the original Eaton Vickers unit—eliminating the need for manifold modifications or piping changes, significantly reducing downtime and retrofit expenses.

Application Areas

• Injection Molding Machinery – Directional switching and sequence control for hydraulic actuators

• Hydraulic Presses – Directional switching for slide lifting and pressing operations

• Machine Tool Hydraulic Systems – Directional control for table reciprocation and tool feed/retract

• Mobile and Construction Equipment – Directional control for concrete pump trucks, drilling rigs, and work attachments

• Material Handling Equipment – Directional control for forklifts and lifting platforms

• Metallurgical Equipment – Directional and sequence control in rolling mill hydraulic systems

• Packaging Machinery – Sequence control and directional switching for actuators

• Industrial Automation Lines – Directional switching and logic control for hydraulic actuators

Expert Maintenance Tips

1. Ensure Solenoid Pressure Chamber is Oil-Filled

Proper operation of wet armature solenoids requires the pressure chamber to be completely filled with oil. During initial installation or after extended shutdown, ensure no air remains trapped in the solenoid chamber—air entrapment will affect solenoid thrust characteristics and response speed.

2. Fluid Cleanliness Management

DG4V-3 series valves have specific fluid cleanliness requirements. The clearance between spool and bore is extremely tight—contaminants can cause spool sticking or abnormal wear. Install filters with a minimum rating of 10μm upstream of the valve and regularly monitor fluid contamination levels.

3. Electrical Connections and Voltage Matching

The standard coil voltage for this series is 24V DC with power consumption of 30 W. Electrical connection uses DIN 43650 / ISO 4400 standard connectors. Verify that the supply voltage matches the valve’s electrical specifications prior to installation. Use shielded cables for control signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.

4. Seal Material Compatibility Confirmation

DG4V-3 series valves feature Viton (Fluorocarbon) seals as standard, providing excellent heat resistance, aging resistance, and chemical corrosion resistance. Confirm that the seal material is compatible with the hydraulic fluid used in the system.

5. Installation and Sealing

Carefully review the Eaton Vickers product documentation prior to installation. Ensure the mounting surface is flat and smooth, with ISO 4401-03 interface compliance. DG4V-3 series uses M5 mounting bolts—tighten evenly to specified torque. Take care not to damage or omit seals during assembly.

6. Periodic Inspection and Maintenance

Regularly verify the valve’s shifting response time. If sluggish response or abnormal heating is detected, inspect the solenoid condition and check for spool sticking. For systems that have been idle for extended periods, perform thorough system circulation filtration before restart.