KDG4V-5-2C65S-ZMUH6-30 Eaton Proportional Valve

Product Overview

The KDG4V-5-2C65S-ZMUH6-30, KDG4V-5-33C50N-H-M-U-HA7-30 and KDG4V333C30XVMUH760 belong to the Eaton Vickers (now Danfoss) KDG4V series of proportional directional control valves. These direct-operated proportional directional valves feature ISO 4401-05 (CETOP 5/NG10) subplate mounting and regulate spool opening and flow in proportion to the input current for precise direction and speed control of hydraulic actuators. Fully interchangeable with original Eaton units, every valve undergoes 100% simulated operating-condition testing for accurate proportional control.

Technical Specifications 

• Model: KDG4V-5-2C65S-ZMUH6-30 / KDG4V-5-33C50N etc. (KDG4V-5 series)
• Type: Proportional directional control valve (no feedback, spring-centered)
• Mounting interface: ISO 4401-05 / NFPA D05 / CETOP 5 / NG10
• Maximum operating pressure: P, A, B ports 315 bar; T port 160 bar
• Rated flow: typically 30 / 50 / 65 L/min (at 5 bar Δp per metering path)
• Spool types: 2C (closed center), 33C etc., meter-in/meter-out or meter-out
• Hysteresis: < 8% of rated flow
• Step response: 0–100% approx. 75 ms
• Solenoid voltage: common 24 V DC
• Weight: approx. 6.8 kg
• Seals: Viton (optional)
• Protection class: IP65 (with correctly fitted electrical plugs)

Key Technical Advantages

1. Precise proportional control: Spool opening and flow are proportional to input current, enabling stepless direction and speed regulation.
2. Low hysteresis and stable performance: Hysteresis < 8% with fast response, suitable for open-loop proportional control.
3. High interchangeability: Identical interfaces and performance to original Eaton Vickers KDG4V series enable direct drop-in replacement.
4. 100% functional verification under simulated conditions: Every unit is fully tested across current-flow characteristics before shipment, ensuring consistency and reliability.

Application Areas

• Proportional directional control on injection molding and die-casting machines
• Machine tool feed and positioning systems
• Actuator speed control on construction machinery
• Precise direction and flow regulation in industrial hydraulic power units
• Open-loop systems requiring electro-proportional control

Expert Maintenance Tips

Ensure the mounting surface is clean and flat; tighten to the specified torque. Maintain recommended fluid cleanliness. Match solenoid voltage and signal correctly. Periodically check null and proportional characteristics. If hysteresis increases or flow becomes unstable, first inspect fluid contamination and filters. For long-term storage keep the valve filled with oil. Always use original-specification seals when servicing.