KDG4V-3-2C15S-M-W-H-40

The KDG4V-3-2C15S-M-W-H-40 valve belongs to the KDG Non-feedback Proportional Valves series and is manufactured by Vickers for hydraulic automation tasks requiring precise flow and pressure control. It operates with a 24 V DC coil voltage rating, allowing integration with standard industrial power supplies. The coil resistance at 20 °C is 7.3 Ω, which determines the initial current draw during energization. An inductance of 20 mH at 1000 Hz helps smooth current transitions and reduces electromagnetic noise. Continuous service is supported by a 100 % ED duty rating so the solenoids can remain energized without a cooling interval. Electrical connection is made through a 1/2 in NPT wiring thread, which matches common conduit fittings. The valve mounts on subplates following the ISO 4401-AB-03-4-A pattern to ensure interchangeability with other CETOP 03 components. An IP65 protection class enclosure shields the coil and connector from dust ingress and water jets during machine wash-down.

The spool is a closed center design on all ports, enabling the actuator to be hydraulically locked when the valve is centered. A spring centered dual solenoid arrangement returns the spool to center when both coils are de-energized and offers bidirectional proportional control. Under a meter-out metering condition, the valve modulates flow leaving the actuator for stable speed regulation. The spool flow rating is 15 L/min, which sets the maximum controllable flow rate for circuit sizing. A maximum operating pressure of 350 bar on ports P, A, and B allows use in high-pressure systems common in mobile and industrial machinery. The recommended pressure drop is limited to 210 bar to balance energy efficiency and heat generation, and the tank port can tolerate the same 210 bar without damaging the housing or seals. Maximum coil current at 50 °C is 1.6 A, providing the necessary magnet force while staying within thermal limits. A water-resistant manual override lets technicians shift the spool during commissioning or power loss without exposing the mechanism to moisture.