KDG4V-3S-2C19N Eaton Vickers Proportional Valve 19 L/min

Product Overview

The KDG4V-3S-2C19N-H-M-U-H5-60 (Supplier Part No. 02-317856) series non-feedback proportional directional valve is manufactured to original Eaton Vickers technical standards. Belonging to the KDG4V-3S series with size 03 (NG6 / CETOP 3 / ISO 4401-03 / NFPA D03), this valve is a standard-performance electro-hydraulic proportional directional control valve. Featuring a direct-operated subplate mounting design conforming to ISO 4401-03, the proportional solenoid directly drives the spool for continuous, proportional control of hydraulic actuator direction and flow.

The KDG4V-3S-2C19N features spool type 2C19N (closed center, meter-in and meter-out), spring-centered, equipped with 24 VDC current-controlled wet armature solenoids and waterproof manual override. The spool flow rating is 19 L/min (5 GPM), with maximum operating pressure of 350 bar (5075 psi) on ports P/A/B and 100 bar (1450 psi) tank port rating. The valve design fills the gap between conventional solenoid valves and servo or feedback proportional valves, providing spool position control and flow throttling for applications not requiring high accuracy, high repeatability, or fast response.

This product is dimensionally and functionally identical to the original Eaton Vickers KDG4V-3S series valve and uses common components with DG4V-3(S)-60 design solenoid valves, significantly reducing installation and maintenance costs. 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: KDG4V-3S-2C19N-H-M-U-H5-60

• Supplier Part No.: 02-317856

• Product Series: KDG4V-3S (Size 03 / NG6 / CETOP 3 / ISO 4401-03 / NFPA D03)

• Design Code: 60 Design

• Spool Type: 2C19N (Closed center, meter-in and meter-out, spring centered)

• Design: Direct-operated, subplate mounting proportional directional valve, non-feedback, double solenoid

• Mounting Pattern: ISO 4401-03 / NFPA D03 / CETOP 3 / NG06

• Installation Position: Any

Hydraulic Parameters

• Spool Flow Rating: 19 L/min (5 GPM)

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

• Tank Port Rating: 100 bar (1450 psi)

• Rated Flow Pressure Drop: Δp = 10 bar (145 psi), looped flow path; Δp = 5 bar (72 psi), single flow path

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

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

• Filtration: ISO 4406 17/15/12

• Seal Material: Fluorocarbon (standard)

• Fatigue Rating: 350 bar (5075 psi) per NFPA

Electrical Parameters

• Supply Voltage: 24 VDC (H5)

• Solenoid Type: Wet armature, current-controlled

• Electrical Connector: U (DIN 43650 standard connector)

• Protection Class: IP65 (with standard connector)

• Manual Override: Waterproof (H)

• Coil Current: 1.6 A

• Duty Cycle: Continuous (ED = 100%)

Materials & Construction

• Valve Body: Cast Iron

• Control Spool: Carburized steel, precision ground

• Seals: Fluorocarbon

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Approx. 2.2 kg (4.89 lbs)

Key Technical Advantages

1. Standard Performance Design with Cost-Effective Optimization
The KDG4V-3S-2C19N-H-M-U-H5-60 belongs to the Eaton Vickers standard performance series, specifically designed for the majority of conventional industrial applications with tank port pressure rating of 100 bar (1450 psi). It is a cost-effective alternative to feedback proportional and servo valves. In applications not requiring high accuracy, high repeatability, or fast response, the valve achieves proportional control of direction and flow at significantly lower cost than servo valves, expanding the range of proportional valve applications.

2. Direct-Operated Design for Fast Response
The valve features a direct-operated design where the proportional solenoid directly drives the spool without pilot-stage delay. The valve is controlled by current applied to solenoid A or B, which creates a force on the solenoid push rod to move the spool until the electromagnetic force balances the return spring force. Spool displacement is proportional to the current through the solenoid coil. Used with Vickers electronic amplifiers, the valve provides an interface between intelligent control systems and the hydraulic cavity, controlling actuator direction and speed while eliminating shock from rapid acceleration or deceleration of machine loads.

3. 2C19N Spool Function with Precision Flow Control
The 2C19N spool provides closed center (all ports blocked) and meter-in + meter-out functions, with a rated flow of 19 L/min (5 GPM). This spool configuration combines flow, direction, acceleration, and deceleration control in a single control valve, achieving precise proportional regulation of actuator speed and direction. The control spool is precision-ground from carburized steel with micron-level clearance control, ensuring low internal leakage and smooth shifting performance.

4. Common Components with DG4V-3(S) Series for Interchangeability
Because it uses common components with Vickers DG4V-3(S) solenoid directional valves, the KDG4V-3S series valve has lower installation costs and is fully interchangeable with standard DG4V-3(S)-60 design valves. The valve body is made of cast iron with fluorocarbon seals, operating stably from -20°C to +80°C. The waterproof manual override (H type) enhances safety and reliability during industrial field commissioning and maintenance. The fully enclosed solenoid coil prevents penetration by ordinary industrial oils, and coil removal and replacement are quick and easy without breaking the hydraulic system’s integrity.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every KDG4V-3S-2C19N-H-M-U-H5-60 valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Eaton Vickers valve, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• Die Casting Machines: Shot system proportional directional control

• Machine Tools: CNC hydraulic clamping systems, feed control

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

• Presses: Proportional speed and direction regulation for hydraulic presses

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

• Turbine Control: Wind, steam, and water turbine governor hydraulic control

• Testing Equipment: Material testing machine hydraulic loading direction control

• Paper Machinery: Paper machine hydraulic control systems

Expert Maintenance Tips

Installation Guidelines

1. The KDG4V-3S-2C19N-H-M-U-H5-60 can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm with a bolt height of 24.6 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-03 / NFPA D03 / CETOP 3 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. Recommended fluid cleanliness is ISO 4406 17/15/12 or better.

3. Electrical Connection: This valve must be used with a Vickers electronic amplifier. Electrical connections must use connectors conforming to DIN 43650 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end to prevent electromagnetic interference causing spool oscillation.

4. Tank Port Back Pressure Management: Tank port rating is 100 bar (1450 psi). Ensure return line back pressure does not exceed this limit. If system return back pressure is high, inspect the return line for blockage or undersized piping.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 17/15/12 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 connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Coil current is 1.6 A; 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 fluorocarbon seals offer excellent high-temperature and chemical resistance. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.

5. Manual Override Maintenance: Periodically check that the waterproof manual override (H type) is in the non-activated state to prevent accidental spool shifting.