Product Overview

The DG4VC-5 is a TOKYO KEIKI fine-current signal solenoid-operated directional control valve designed for industrial hydraulic systems requiring direct electrical signal control.

TOKYO KEIKI’s official documentation identifies the DG4VC-5 as a wet-armature directional control valve with an integrated solid-state relay. The valve can be directly driven through its signal terminals from PLCs and similar control equipment, while its hydraulic performance is the same as the standard DG4V-5 solenoid-operated directional valve.

The two complete models specified here are:

• DG4VC-5-6C-M-PS2-H-7-40-JA170
• DG4VC-5-6C-M-PN2-H-7-50-JA872

Both use the 6C spool configuration, which is a spring-centered, three-position, double-solenoid arrangement. The main electrical difference is the input logic: PS2 is sink type, while PN2 is source type. The H code specifies a 24 VDC solenoid, while code 7 specifies an allowable tank-port back pressure of 20.6 MPa.

For replacement applications, accurate matching of the hydraulic interface and electrical logic is essential. Our replacement program emphasizes in-situ interchangeability together with 100% simulated operating-condition testing.

Technical Specifications (Bulleted List)

Common DG4VC-5 Specifications

• Manufacturer: TOKYO KEIKI INC.
• Product Series: DG4VC-5
• Product Type: Fine Current Signal Solenoid Operated Directional Control Valve
• Mounting: Gasket mounting
• Mounting Interface: ISO 4401-AC-05-4-A
• Construction: Wet armature type
• Maximum Working Pressure: 31.5 MPa
• Allowable Tank Port Back Pressure: 20.6 MPa
• Maximum Switching Frequency: 180 cycles/min
• Weight, Single Solenoid: 4.4 kg
• Weight, Double Solenoid: 6.1 kg

DG4VC-5-6C-M-PS2-H-7-40-JA170

• Full Model Code: DG4VC-5-6C-M-PS2-H-7-40-JA170
• Spool Type: 6
• Spring Arrangement: C
• Spool Function: Spring centered, 3 position, double solenoid
• Input Type: PS2
• Input Logic: Sink
• Solenoid Voltage: 24 VDC
• Supply Voltage Tolerance: 24 VDC ±10%
• Holding Current: 1.58 A
• Power Consumption: 38 W
• Insulation Class: H
• Solenoid Allowable Temperature: 180°C
• Tank Port Back Pressure: 20.6 MPa
• Design Number: 40
• JA170: Complete ordering suffix; no separate engineering definition was verified in the current public TOKYO KEIKI DG4VC-5 general catalog.

DG4VC-5-6C-M-PN2-H-7-50-JA872

• Full Model Code: DG4VC-5-6C-M-PN2-H-7-50-JA872
• Spool Type: 6
• Spring Arrangement: C
• Spool Function: Spring centered, 3 position, double solenoid
• Input Type: PN2
• Input Logic: Source
• Solenoid Voltage: 24 VDC
• Supply Voltage Tolerance: 24 VDC ±10%
• Holding Current: 1.58 A
• Power Consumption: 38 W
• Insulation Class: H
• Solenoid Allowable Temperature: 180°C
• Tank Port Back Pressure: 20.6 MPa
• Design Number: 50
• JA872: Complete ordering suffix; no separate engineering definition was verified in the current public TOKYO KEIKI DG4VC-5 general catalog.

Displacement and Rotational Speed

• Displacement: Not applicable; the DG4VC-5 is a hydraulic directional control valve, not a pump or motor.
• Maximum Rotational Speed: Not applicable; the valve has no rotational speed rating.

Maximum Flow

The manufacturer does not define DG4VC-5 with one universal fixed maximum-flow figure. TOKYO KEIKI specifies that its spool pressure-flow characteristics are the same as the standard DG4V-5 series and directs users to the DG4V-5 pressure-flow characteristics for the actual value.

For the 6C spool, the official DG4V-5 characteristics show that allowable flow varies with pressure and flow path. The published characteristic range can reach approximately 160 L/min under specified conditions, but this figure should not be treated as a universal rating for every DG4VC-5-6C installation.

Key Technical Advantages

1. Integrated Solid-State Relay

The integrated solid-state relay is one of the defining features of the DG4VC-5. TOKYO KEIKI states that the valve can be directly driven by connecting its signal terminal to a PLC or similar controller.

This makes the valve particularly suitable for automated hydraulic systems where direct PLC-to-valve interfacing is required.

2. Wet-Armature Solenoid Construction

The DG4VC-5 uses a wet-armature solenoid design and maintains the hydraulic performance of the standard DG4V-5 platform. TOKYO KEIKI also highlights low switching noise and long valve life in its DG4V-5 documentation.

3. No Sliding-Surface Seals

TOKYO KEIKI specifies that the standard DG4V-5 construction has no seals on sliding surfaces, reducing leakage concerns associated with sliding seal wear. This is a meaningful engineering advantage for high-cycle directional switching applications.

4. Three-Position Spring-Centered 6C Spool

The 6C spool provides a spring-centered, three-position, double-solenoid configuration. When neither solenoid is energized, the spool returns to its defined center position through spring force.

This configuration is well suited to hydraulic actuators requiring distinct extend, neutral and retract directional states.

5. 31.5 MPa Pressure Capability

The DG4VC-5 has a verified 31.5 MPa maximum working pressure, providing a high-pressure control platform for a broad range of industrial hydraulic systems.

The maximum working pressure should not, however, be interpreted as the recommended continuous operating pressure for every application.

6. PS2 and PN2 Signal Variants

The two specified model variants provide different electrical input logic:

• PS2 — Sink input
• PN2 — Source input

Therefore, replacement selection must account for the PLC/output-interface architecture rather than matching only the 24 VDC coil specification.

Application Areas

Typical applications include:

• CNC machine hydraulic systems
• Machine tools
• Pressing and forming equipment
• Injection molding machinery
• Industrial hydraulic power units
• Automated hydraulic production lines
• Hydraulic clamping systems
• Material-handling equipment
• PLC-controlled hydraulic circuits
• Industrial machinery using 24 VDC hydraulic controls

Final selection should verify the ISO 4401-AC-05-4-A interface, 6C spool, 24 VDC supply, PS2/PN2 logic, tank-port back pressure and actual pressure-flow requirements.

Expert Maintenance Tips

1. Verify PS2 or PN2 Logic Before Wiring

The PS2 and PN2 versions should not be treated as electrically interchangeable simply because both use 24 VDC. Confirm the controller output logic before installation.

2. Control Tank-Port Back Pressure

Code 7 specifies an allowable T-port back pressure of 20.6 MPa. Tokyo Keiki specifically warns against abnormal pressure surges at the tank port.

Check return-line sizing, return filters, common return manifolds and transient pressure spikes during maintenance.

3. Keep the Wet-Armature Valve Filled With Hydraulic Oil

Because the DG4VC-5 is a wet-armature valve, Tokyo Keiki instructs users to ensure that the valve remains filled with hydraulic oil.

4. Avoid Prolonged Energization at High Pressure

Tokyo Keiki warns that prolonged solenoid energization under high-pressure conditions may contribute to spool sticking and switching malfunction.

5. Size Flow From the Pressure-Flow Curve

For the 6C configuration, do not select the valve using a generic single flow number. Use the official DG4V-5 6C pressure-flow characteristics together with the actual pressure and flow-path requirements.