HD – 4WRKE – Proportional Directional Valve, pilot operated with Electrical position feedback
Master the movement of your largest hydraulic actuators with the ultimate combination of high-volume power and closed-loop precision: the HD 4WRKE Series. Available through Thm Hydraulics, this pilot-operated, 2-stage directional valve is engineered for massive industrial machinery requiring more than just simple "on/off" control. The 4WRKE utilizes a high-response proportional pilot stage to command a robust main spool, allowing your digital control systems to infinitely govern both the direction and the precise magnitude of fluid flow. By integrating Electrical Position Feedback directly on the main spool, this valve operates in a closed-loop system, guaranteeing that your commanded velocity or position is executed with unyielding accuracy. Capable of handling extreme operating pressures up to 35M Pa (350 bar) and monumental flow rates up to 3000 L/min, the 4WRKE series is the premier choice for high-performance automation where massive forces must be moved with smooth, predictable finesse.
Core Technical Specifications:-
- Component Architecture: Pilot Operated 2-Stage Proportional Directional Valve
- Nominal Sizes: Size 10, 16, 25, 32, and 35
- Control Intelligence: Integrated Electronics (OBE - On-Board Electronics)
- Feedback Mechanism: Main Stage Closed-Loop Position Control (Electrical Position Feedback)
- Maximum Operating Pressure: Up to 35M Pa (350 bar)
- Maximum Flow Capacity: Up to 3000 L/min
- Actuation: Proportional Solenoid (Pilot Operated)
Key Features & Engineering Advantages:-
- Main Stage Closed-Loop Control: The main control spool features integrated Electrical Position Feedback. This LVDT continuously monitors the spool’s position and reports back to the Integrated Electronics, which instantly corrects for any flow disturbances or pressure fluctuations. This ensures the valve delivers the exact flow rate commanded, every single time.
- Integrated OBE Control: Features factory-calibrated On-Board Electronics (OBE). This drastically reduces wiring complexity, eliminates external amplifier cards in your control cabinet, and provides superior noise immunity for clean, high-fidelity signal transmission directly at the valve.
- Dual-Stage Control Logic: Utilizes a high-response single-stage proportional directional valve as the pilot control. This configuration allows for the effortless command of massive fluid forces (up to 3000 L/min) using a low-power, precise electrical input signal.
- Monumental Flow & Pressure Handling: Forged to withstand the most intense industrial environments, comfortably managing 35M Pa pressure cycles and high-volume flow venting without excessive pressure drop or heat generation.
- Spring-Centered Failsafe: The main spool is spring-centered, ensuring that in the event of a power failure or signal loss, the valve immediately returns to a safe neutral position, preventing dangerous actuator drift.
- Unified Control Solutions: For maximum performance, both the high-accuracy 2-stage valve and the integrated proportional electronics are sourced from a single supplier, ensuring perfect signal-to-flow calibration.
Ideal Industry Applications
The massive flow capacity and closed-loop precision make the HD 4WRKE Series the premier choice for:
- Heavy-Duty Industrial Presses: Controlling the high-speed approach and precisely modulating the extreme pressing velocities required for metal forging, stamping, and extrusion.
- Steel & Aluminum Rolling Mills: Governing the rapid, high-force adjustments required for mill stand positioning, tension control, and active vibration damping.
- Large-Scale Marine & Offshore: Managing the dynamic, high-power requirements of heavy-duty winches, steering gears, and massive ship-lift systems.
- Civil Engineering & Infrastructure: Providing primary directional logic for massive hydraulic dam gates, bridge movement systems, and tunnel boring machinery.
Why Choose the HD 4WRKE Series?
- Master Massive Power with Finesse: Closed-loop position feedback eliminates mechanical hysteresis. If you command 50% flow, you get exactly 50% flow, regardless of load pressure, fluid viscosity, or temperature changes.
- "Plug-and-Play" High Power: By integrating the electronics onto the valve body, you slash installation time and cabinet space requirements while gaining superior proportional accuracy.
- Protect Your Mechanical Investment: Proportional control eliminates the hydraulic shock common with standard valves, protecting your structure and extending the life of your pumps, cylinders, and seals.
