Rexroth 4WMM Series Manual Directional Valve | 4WMM6 4WMM10 4WH6 | Hydraulic Control Valve

The 4WMM and 4WH Series directional valves from Chengyuan Hydraulic are high-performance control components fully compatible with Rexroth specifications. The 4WMM series is hand-lever operated, while the 4WH series is hydraulically operated. Designed to manage the start, stop, and direction of fluid flow, these valves feature high-strength cast bodies and precision-lapped spools. Every unit offers 100% original-place interchangeability and has undergone 100% simulated condition testing, ensuring stable switching performance under pressure fluctuations and harsh environments.

Technical Specifications :

• Model Range: 4WMM6E5X/F, 4WMM10E3X/F, 4WH6E5X/V, 4WMM6E-80

• Nominal Sizes: Size 6 / Size 10

• Max Operating Pressure (P/A/B): 31.5 MPa (4570 psi)

• Max Pressure at T-port: 16 MPa (2320 psi)

• Maximum Flow Rate:

  • Size 6: Up to 60 L/min (15.8 gpm)

  • Size 10: Up to 120 L/min (31.7 gpm)

• Control Method: Manual Hand Lever (4WMM) / Hydraulic Pilot (4WH)

• Fluid Media: Mineral oil (HL, HLP) according to DIN 51524

• Fluid Temperature Range: -30°C to +80°C

Key Technical Advantages:

• Heavy-Duty Lever Mechanism: The 4WMM series features a reinforced manual actuator. The lever can be repositioned to suit installation constraints and provides tactile feedback for precise shifting, even in demanding industrial environments.

• Optimized CFD Flow Channels: Internal flow passages are optimized using Computational Fluid Dynamics to minimize pressure drops at high flow rates, reducing heat generation and improving overall energy efficiency.

• Precision-Lapped Spools: Spools are crafted from specialized alloy steel with micron-level tolerances. This precision minimizes internal leakage and enhances pressure-holding capability under high-pressure conditions.

• Seamless Interchangeability: Fully compliant with ISO 4401 mounting standards. These valves can directly replace existing Rexroth 4WMM series units without modifying piping or manifolds, drastically reducing maintenance downtime.

Application Areas:

• Mobile Machinery: Auxiliary hydraulic control for mini-excavators, rollers, and agricultural vehicles.

• Industrial Presses: Directional control for hydraulic balers, molding machines, and simple punching presses.

• Mining Equipment: Support systems and hydraulic roof supports for underground mining machinery.

Expert Maintenance Tips:

• Reset Verification: For spring-return models, manually actuate the lever 3-5 times post-installation to ensure there is no binding and that the spool snaps back to center reliably.

• Back-Pressure Monitoring: Always monitor the T-port pressure. If back-pressure exceeds 16MPa, operating the lever will become significantly harder, and seals or spool functionality may be compromised.

• Dust Boot Inspection: For outdoor use, periodically inspect the dust boot at the base of the lever to prevent ingress of grit, which can cause premature wear on the spool mechanism.