HD – 4WRA – Proportional directional valves, Direct actuated, without electrical feedback
Achieve smooth, variable control over your hydraulic actuators with the HD 4WRA Series Proportional Directional Valve. Available through Thm Hydraulics, this direct-actuated valve is engineered for systems that require more than simple "on/off" functionality but do not demand the complexity of electronic feedback. By using high-performance proportional solenoids, the 4WRA allows you to infinitely adjust both the direction and the volume flow of hydraulic fluid. Capable of handling operating pressures up to 315 bar and flow rates up to 95 L/min, this series is the ideal solution for industrial machinery requiring controlled acceleration, deceleration, and precise speed regulation.
Core Technical Specifications:-
- Component Architecture: Direct Actuated Proportional Directional Valve (without electrical feedback)
- Model Type: HD-4WRA
- Maximum Operating Pressure: Up to 315 bar
- Maximum Flow Capacity: Up to 95 L/min
- Actuation Type: Wet-pin DC Proportional Solenoids
- Mounting Style: Sub-plate mounting
Key Features & Engineering Advantages:-
- Proportional Flow & Directional Logic: Unlike standard directional valves, the 4WRA opens its internal spool in direct proportion to the electrical current supplied. This allows you to "throttle" the speed of your cylinders or motors electronically.
- Spring-Centered Control Spool: Features a robust spring-centering mechanism that ensures the valve returns to a safe neutral position immediately upon power loss, preventing uncontrolled actuator drift.
- Wet-Pin Solenoid Technology: The DC proportional solenoids operate within the hydraulic fluid. This "wet-pin" design provides natural lubrication and heat dissipation to the internal armature, significantly extending the valve’s service life in high-cycle environments.
- Simplified Control Architecture: Because this model operates without electrical position feedback, it is easier to install and maintain, providing a cost-effective entry point into proportional hydraulic control.
- Unified System Source: For optimal performance and ease of commissioning, both the high-quality valve and the required electronic control amplifiers are available from a single source, ensuring perfect signal-to-flow calibration.
- Standardized Sub-Plate Mounting: Designed for leak-free mounting on standard manifold blocks, making it an easy "drop-in" upgrade for existing hydraulic systems.
Ideal Industry Applications:-
The variable speed control and 315 bar endurance make the HD 4WRA Valve the premier choice for:
- Automated Conveyor Systems: Providing smooth "soft-starts" and "soft-stops" to prevent product damage or tipping on high-speed assembly lines.
- Compact Industrial Presses: Governing the approach and pressing speeds for light-duty metal forming and component assembly.
- Material Handling Equipment: Enabling precise, jerk-free movement for industrial lifts, tilting platforms, and robotic manipulators.
- Machine Tool Auxiliaries: Controlling the variable feed rates for auxiliary tooling, clamping, and indexing functions on CNC machinery.
Why Choose the HD 4WRA Series?
- Eliminate Hydraulic Shock: Stop the violent "thump" in your pipes. By electronically ramping the flow up and down, you protect your hoses, seals, and pumps from destructive pressure spikes.
- Dial in the Perfect Speed: No more manual needle valve adjustments. Change your machine's cycle speed instantly via your PLC or a remote potentiometer.
- Rugged Simplicity: The feedback-free design offers a high degree of reliability in harsh environments where external sensors might be prone to damage or interference.
