4WH Series Hydraulic Valve | 4WH6 4WH10 4WH16 4WH25 4WH32 | Hydraulic Operated Directional Valve | Rexroth Style

4WH Series Hydraulic Operated Directional Control Valves

Product Overview: The 4WH series is a high-performance directional control valve that utilizes hydraulic pilot pressure to shift the main spool. Unlike solenoid-driven valves, the 4WH series is actuated by pressure signals from a pilot circuit, making it ideal for heavy-duty industrial environments with limited electrical access, explosion-proof requirements, or systems needing synchronization with pilot pressures. Spanning from the compact 4WH6 to the ultra-high flow 4WH32, this series provides precise control over the direction, start, and stop of hydraulic fluid. Its rugged construction is widely used in metallurgical equipment, large shearing machines, and heavy-duty hydraulic power units.

Featured models: 4WH6D, 4WH10, 4WH16, 4WH22, 4WH25, and 4WH32.

Key Technical Advantages:

• Hydraulic Actuation Logic: Operates without electrical coils, eliminating electrical failure risks and performing robustly in hazardous or high-EMI environments.

• Extensive Flow Range: Covers standards from NG6 to the massive NG32, with flow capacities capable of meeting the most demanding engineering tasks.

• High Response & Smooth Shifting: By adjusting the pilot pressure and flow, the shifting speed of the main spool can be controlled smoothly, significantly reducing hydraulic shock.

• Versatile Spool Functions: Offers a variety of center positions (e.g., D, E, J types) to adapt to cylinder locking, unloading, or floating control strategies.

• Standardized Mounting: Fully compliant with DIN 24340 and ISO 4401 standards, ensuring excellent interchangeability with international brands.

Detailed Specifications & Parameters:

• Full Series Specification Matrix:

  • 4WH6 (NG6): Max flow approx. 60 L/min.

  • 4WH10 (NG10): Max flow approx. 120 L/min.

  • 4WH16 (NG16): Max flow approx. 300 L/min.

  • 4WH25/32 (NG25/32): Heavy-duty specifications, flow rates up to 1100 L/min.

• Core Technical Specs:

  • Max Operating Pressure: 31.5 MPa (315 bar) up to 35 MPa (350 bar).

  • Min Pilot Pressure: Typically between 0.8 MPa and 1.2 MPa, depending on spring centering configuration.

  • Fluid Compatibility: Mineral oils, phosphate ester fluids, etc.

  • Sealing Material: Standard NBR; FKM (Viton) available for high-temperature or special fluid needs.