HD – 4WRH – Proportional Directional Valves External pilot Operated
Achieve the ultimate in dynamic motion control and high-volume fluid management with the HD 4WRH Series Proportional Directional Valves. Available through THM Hydraulics, these externally pilot-operated valves are engineered for massive industrial systems that require more than simple "on/off" switching. By combining a proportional pilot stage (WRZ) with a robust main stage (WRH), this series allows you to precisely govern both the direction and the flow rate of hydraulic fluid simultaneously. Capable of handling extreme operating pressures up to 350 bar and monumental flow volumes up to 1600 L/min, the 4WRH series is the premier choice for high-performance automation where smooth acceleration, deceleration, and pinpoint positioning are mandatory.
Core Technical Specifications:-
- Component Architecture: Pilot Operated Proportional Directional Valve
- Nominal Sizes: Size 10, 16, 25, and 32
- Maximum Operating Pressure: Up to 350 bar
- Maximum Flow Capacity: Up to 1600 L/min
- Actuation Type: Proportional Solenoid (Pilot Operated)
- Standardization: Porting pattern to DIN 24 340 Form A, ISO 4401, and CETOP-RP 121H
- Mounting Style: Subplate Mounting
Key Features & Engineering Advantages:-
- Dual-Stage Control Logic: Utilizes a high-response proportional pilot valve to shift the large main spool. This allows for the effortless control of massive fluid forces (up to 1600 L/min) with a low-power electronic signal.
- Spring-Centered Reliability: The main spool is spring-centered, ensuring that in the event of a power loss or signal failure, the valve returns to a safe neutral position with zero spool drift.
- Optimized Efficiency: Specifically designed with low pressure-drop characteristics across the control lands, maximizing the usable power delivered to your actuators and reducing system heat generation.
- Unified Electronic Integration: For maximum performance, both the valve and the required electronic control amplifiers can be sourced together, ensuring perfect signal-to-flow calibration and simplified commissioning.
- Infinitely Variable Regulation: Unlike standard valves, the proportional solenoid allows you to ramp speeds up or down smoothly, eliminating the mechanical "jerk" and hydraulic water-hammer effect in high-speed machinery.
- Universal Standard Compatibility: Adheres to global ISO and CETOP mounting patterns, allowing for a seamless, high-performance upgrade to existing manifold blocks.
Ideal Industry Applications:-
The massive flow capacity and precision proportional control make the HD 4WRH Series the premier choice for:
- Heavy-Duty Industrial Presses: Controlling the high-speed approach and precise pressing velocities of massive metal forging and stamping equipment.
- Steel & Aluminum Rolling Mills: Governing the rapid, high-force adjustments required for mill stand positioning and tension control.
- Large-Scale Marine Engineering: Managing the synchronized movement of heavy-duty winches, steering gears, and massive ship-lift systems.
- Civil Engineering & Infrastructure: Operating the primary directional logic for massive dam gate controls and tunnel boring machinery.
Why Choose the HD 4WRH Series?
- Master Massive Power with Finesse: Stop treating your heavy machinery like a blunt instrument. Proportional control gives you the "soft touch" needed to move thousands of pounds with millimeter precision.
- Extend Machine Life: By eliminating sudden pressure spikes through smooth electronic ramping, you significantly reduce wear and tear on your pumps, hoses, and cylinders.
- Ready for Industry 4.0: These valves bridge the gap between heavy fluid power and digital PLC control, allowing your software to dictate every nuance of the hydraulic cycle.
