Rexroth 4WMM6 Series Manual Valve | 4WMM6E 4WMM6J 4WMM6G | Hydraulic Hand Lever Valve

Chengyuan Hydraulic presents the 4WMM6 Series manual directional control valves, meticulously engineered as premium replacements for Rexroth industrial standards. This series, featuring diverse spool functions such as 4WMM6J50B/F, 4WMM6H50B/F, 4WMM6E50B, and 4WMM6G50B, is ideal for industrial hydraulic systems where electrical control is unavailable or environmental conditions are severe. As a benchmark in manual control technology, Chengyuan ensures 100% Drop-in Interchangeability regarding mounting interface dimensions (compliant with ISO 4401-03 / NG6), hand lever operating force, and flow characteristics compared to original Rexroth units. Supported by our 100% Simulation Load Testing, each 4WMM valve undergoes rigorous internal leakage verification and switching reset tests to provide precise, intuitive motion control for heavy-duty machinery and mobile equipment.

Technical Specifications 

• Series Category: 4WMM6 (Size 6 / NG6)

• Mounting Type: Subplate Mounting

• Max Operating Pressure (Ports P, A, B): 315 bar (31.5 MPa)

• Max Tank Port Backpressure (Port T): 60 bar (6 MPa)

• Max Flow Rate: 60 L/min

• Spool Functions: E (All ports blocked), G (P blocked, AB to T), J (PT blocked, AB connected), H (All ports open)

• Positioning: Suffix F (Spring return) / Without F (Detent / Ball indexing)

• Operating Temperature: -30°C to +80°C (depending on seals)

• Lever Operating Angle: Approx. 15° – 20° (either direction)

Key Technical Advantages:

• Ergonomic Lever Linkage: The optimized geometry between the hand lever and shifting fork provides a smooth, tactile feel. Operating forces remain manageable even under full pressure conditions, significantly reducing operator fatigue.

• Precision-Lapped Spools: Spools are crafted from 20Cr alloy steel, carburized and quenched to a hardness of over HRC 60, followed by high-precision cylindrical grinding. Micron-level clearances ensure flexible switching while strictly controlling internal leakage at high pressures.

• Reinforced Casting Body: The high-strength ductile iron body offers superior pressure and fatigue resistance. Streamlined internal flow paths minimize pressure drop (ΔP), reducing system heat generation and improving energy efficiency.

• Comprehensive Dust Protection: A thick, oil-resistant rubber bellows protects the operating mechanism. This prevents dust, moisture, and corrosive media from compromising the shifting assembly, ensuring reliable long-term operation in metallurgical, mining, and construction environments.

Application Areas:

• Mobile Equipment: Manual attachment control for agricultural vehicles, mini-cranes, and recovery trucks.

• Industrial Presses: Directional control for pressure testing machines and manual balers.

• Marine Equipment: Manual emergency control for winch drives and hatch cover lifting circuits.

• Oilfield Machinery: Manual diversion systems for drilling rig consoles and auxiliary power units.

Expert Maintenance Tips:

• Mounting Surface Inspection: Ensure the subplate surface is clean before installation. Flatness should be within 0.01mm/100mm. Use Grade 12.9 M5x50 bolts with a recommended tightening torque of 8.9 Nm.

• Bellows Maintenance: Regularly check the rubber dust cover at the base of the lever. Replace it immediately if damaged to prevent grit from entering and seizing the spool.

• Return Pressure Limits: The 4WMM6 series is sensitive to T-port backpressure. Ensure the return line is unobstructed; backpressure exceeding 60 bar may lead to excessive lever resistance or incomplete shifting.