KDG4V-3-33C30X-H-M-U-H7-60 Vickers Proportional Valve

Product Overview

The Vickers by Danfoss KDG4V-3 60 Series is a direct-operated proportional directional valve designed for industrial hydraulic flow and directional control.

The three configurations covered here are:

• KDG4V-3-33C30X-H-M-U-H7-60
• KDG4V-3-2C28S-H-M-U-G7-60
• KDG4V-3-2C28S-H-M-U-H7-60

The series uses a single-stage, solenoid-operated, spring-centered architecture with a standard ISO 4401-03 / NFPA D03 / CETOP 3 / NG06 interface. This makes it suitable for standardized subplate or manifold-mounted industrial hydraulic systems.

The exact configuration is critical when replacing a KDG4V-3 valve. Flow capacity, coil voltage and spool function vary by model code.

For example, KDG4V-3-33C30X-H-M-U-H7-60 is specified at 30 L/min per A/B port, 24 V DC, 350 bar maximum pressure and P-blocked/A&B-to-tank spool function.

The KDG4V-3-2C28S-H-M-U-H7-60 is specified at 28 L/min per A/B port, 24 V DC, closed center, meter-out operation and 350 bar maximum pressure.

Technical Specifications

KDG4V-3-33C30X-H-M-U-H7-60

• Manufacturer: Vickers by Danfoss
• Product Series: KDG4V-3
• Design Series: 60
• Model Code: KDG4V333C30XHMUH760
• Valve Type: Proportional Directional Valve
• Construction: Single Stage
• Actuation: Solenoid Controlled
• Centering: Spring Centered
• Coil Voltage: 24 V DC
• A Port Flow: 30 L/min / 7.90 US GPM
• B Port Flow: 30 L/min / 7.90 US GPM
• Maximum Pressure: 350 bar / 5000 psi
• Tank Port Rating: 210 bar / 3000 psi
• Spool Function: P Blocked, A & B to Tank
• Interface: ISO 4401-03 / NFPA D03 / CETOP 3 / NG06
• Mounting: Subplate
• Connector: ISO 4400 / DIN 43650
• Feedback Sensor: No
• Onboard Electronics: No
• Performance: Standard
• Seal Material: Viton
• Fluid Cleanliness: 17/15/12
• Working Temperature: -20°C to +70°C
• Manual Override: Water-resistant
• Dimensions: approx. 238 × 48.26 × 86.36 mm
• Displacement: Not applicable
• Rotational Speed: Not applicable

KDG4V-3-2C28S-H-M-U-G7-60

• Manufacturer: Vickers by Danfoss
• Product Series: KDG4V-3
• Design Series: 60
• Model Code: KDG4V32C28SHMUG760
• Valve Type: Proportional Directional Valve
• Construction: Single Stage
• Actuation: Solenoid Controlled
• Centering: Spring Centered
• Coil Voltage: 12 V DC
• A Port Flow: 28 L/min / 7.40 US GPM
• B Port Flow: 28 L/min / 7.40 US GPM
• Maximum Pressure: 350 bar / 5000 psi
• Tank Port Rating: 210 bar / 3000 psi
• Spool Function: All Ports Blocked / Closed Center
• Metering: Meter Out
• Interface: ISO 4401-03 / NFPA D03 / CETOP 3 / NG06
• Mounting: Subplate
• Connector: ISO 4400 / DIN 43650
• Feedback Sensor: No
• Onboard Electronics: No
• Performance: High
• Seal Material: Viton
• Fluid Cleanliness: 17/15/12
• Working Temperature: -20°C to +70°C
• Manual Override: Water-resistant
• Displacement: Not applicable
• Rotational Speed: Not applicable

KDG4V-3-2C28S-H-M-U-H7-60

• Manufacturer: Vickers by Danfoss
• Product Series: KDG4V-3
• Design Series: 60
• Model Code: KDG4V32C28SHMUH760
• Valve Type: Proportional Directional Valve
• Construction: Single Stage
• Actuation: Solenoid Controlled
• Centering: Spring Centered
• Coil Voltage: 24 V DC
• A Port Flow: 28 L/min / 7.40 US GPM
• B Port Flow: 28 L/min / 7.40 US GPM
• Maximum Pressure: 350 bar / 5000 psi
• Tank Port Rating: 210 bar / 3000 psi
• Spool Function: All Ports Blocked / Closed Center
• Metering: Meter Out
• Interface: ISO 4401-03 / NFPA D03 / CETOP 3 / NG06
• Mounting: Subplate
• Connector: ISO 4400 / DIN 43650
• Feedback Sensor: No
• Onboard Electronics: No
• Performance: Standard
• Seal Material: Viton
• Fluid Cleanliness: 17/15/12
• Working Temperature: -20°C to +70°C
• Manual Override: Water-resistant
• Displacement: Not applicable
• Rotational Speed: Not applicable

Key Technical Advantages

Standard NG06 Interface

The KDG4V-3 series uses the ISO 4401-03 / NFPA D03 / CETOP 3 / NG06 mounting interface, making it suitable for standard hydraulic manifolds and subplates.

350 bar Maximum Pressure

The selected models are rated for up to 350 bar / 5000 psi, supporting demanding industrial hydraulic applications such as presses, machine tools and metal-processing equipment.

Direct-Acting Single-Stage Architecture

The single-stage direct-operated configuration provides a relatively simple control path from the solenoid to the spool, reducing the complexity associated with two-stage pilot-operated proportional valves.

Application-Specific Spool Geometry

The spool code is an engineering-critical parameter.

The 33C30X configuration uses:

P blocked, A & B to tank

while the 2C28S configuration uses:

All ports blocked / closed center

These configurations provide substantially different hydraulic behavior and must not be treated as interchangeable simply because the valve body and mounting interface are similar.

Viton Sealing

The identified configurations use Viton seals. This provides an appropriate sealing solution for applications requiring fluorocarbon elastomer compatibility, subject to verification against the actual hydraulic fluid and temperature range.

Controlled Hydraulic Cleanliness

The specified fluid cleanliness level is 17/15/12, making contamination control an important part of achieving stable proportional performance and long service life.

OEM-Oriented Interchangeability

When the complete ordering code is matched, the standard mounting interface, electrical connection and spool configuration make these valves practical candidates for OEM replacement and field service applications.

Our replacement units are manufactured with emphasis on dimensional interchangeability and undergo 100% simulated operating-condition testing before shipment.

Application Areas

Typical applications for the KDG4V-3 proportional valve platform include:

• Die casting and foundry machinery
• Machine tools
• Hydraulic presses
• Marine and offshore equipment
• Primary metal processing equipment
• Paper machinery
• Hydraulic test and simulation equipment
• Turbine control systems
• Industrial hydraulic motion systems
• Automated hydraulic production machinery

Expert Maintenance Tips

Verify the Complete Model Code

Always confirm the complete ordering code before replacement.

The difference between:

KDG4V-3-2C28S-H-M-U-G7-60

and

KDG4V-3-2C28S-H-M-U-H7-60

includes the coil-voltage configuration. The former is specified at 12 V DC, while the latter is specified at 24 V DC.

Match the Spool Function

Do not replace a closed-center 2C28S valve with a 33C30X valve simply because both are NG06 proportional valves. The spool-center behavior is different and can directly affect actuator holding, unloading and pressure characteristics.

Maintain Hydraulic Cleanliness

Keep the hydraulic system at the specified 17/15/12 cleanliness level. Check the return filter, pressure filter and reservoir contamination level before commissioning a replacement valve.

Check the Subplate

Inspect the mounting surface for scoring, burrs or contamination. A damaged or contaminated subplate can cause leakage even when the replacement valve itself is functioning correctly.

Commission Gradually

Because the valve is rated up to 350 bar, hydraulic pressure should be increased gradually after installation. Check center position, coil response, A/B port flow direction, pressure build-up, spool return and leakage before applying full machine load.

Perform Dynamic Testing

For replacement applications, a static electrical test is not sufficient. Verify the valve under simulated or actual operating conditions, including proportional response, hydraulic pressure, actuator motion and thermal stability.