Rexroth 4WE 4WEH Series Solenoid Valve | 4WE6 4WE10 4WEH16 4WEH25 | Hydraulic Directional Control Valve

The Rexroth 4WE and 4WEH Series Compatible Solenoid Directional Valves manufactured by Chengyuan Hydraulic are high-performance fluid power switching components engineered to fully match the definitive engineering standards of Bosch Rexroth. This premium, ready-to-ship replacement matrix systematically spans high-demand market sizes across both direct-operated and pilot-operated configurations, including the direct-acting solenoid spools 4WE6 (Size 6mm) and 4WE10 (Size 10mm), the pilot-operated electro-hydraulic heavy-duty platforms 4WEH16 (Size 16mm) and 4WEH25 (Size 25mm), and specialized derived platforms such as the 4DWG6G60/AC220 high-pressure, zero-leak-back control valve outfitted with a standard AC220V alternative current coil.

Operating as the critical central command nexus governing the acceleration, deceleration, and operational direction of heavy cylinders and hydraulic motors, a directional valve’s internal volumetric restriction and spool sealing boundary directly dictate system heating curves and position repeatability. Chengyuan guarantees 100% original-place drop-in interchangeability across all variants regarding subplate interface layouts (fully adhering to standard ISO 4401, CETOP, and DIN 24340 footprints), spool symbol configurations (including center conditions E, G, H, J, etc.), return spring stroke pre-loads, and inductive magnetic coil force specifications. Before delivery, every directional control setup is subjected to 100% full-capacity simulated pressure and extreme flow tracking tests on automated digital benches, guaranteeing low-hysteresis shifting response under rigorous cyclic mechanical loading.

Technical Specifications 

• Compatible Brand: Bosch Rexroth (Industrial Slide-Spool Valve Infrastructure)

• Target Replacement Model Codes: 4WE6, 4WE10, 4WEH16, 4WEH25, 4DWG6G60/AC220

• Subplate Mounting Footprints (Interface):

  • Size 6 Layout (4WE6 / 4DWG6): ISO 4401-03-02-0-05 / CETOP 3

  • Size 10 Layout (4WE10): ISO 4401-05-04-0-05 / CETOP 5

  • Size 16 Layout (4WEH16): ISO 4401-07-07-0-05 / CETOP 7

  • Size 25 Layout (4WEH25): ISO 4401-08-08-0-05 / CETOP 8

• Maximum Rated Operating Pressure (Ports A, B, P):

  • Direct-Acting Series (4WE6 / 4WE10): 315 bar up to 350 bar (31.5 – 35 MPa / 5075 psi)

  • Pilot-Operated Series (4WEH16 / 4WEH25): 315 bar (31.5 MPa) continuous duty

• Maximum Allowed Tank Line Backpressure (Port T):

  • Direct Solenoid Models: Up to 210 bar for stable DC coils; up to 160 bar for high-inductive AC configurations (e.g., AC220V)

  • Pilot Electro-Hydraulic Models: Dependent on inner/outer drain plugging configurations (nominally recommended $\le 100$ bar for longevity)

• Maximum Volumetric Flow Capacities:

  • Size 6 (4WE6) Variants: Up to 80 L/min (21 GPM)

  • Size 10 (4WE10) Variants: Up to 120 L/min (32 GPM)

  • Size 16 (4WEH16) Variants: Up to 300 L/min (79 GPM)

  • Size 25 (4WEH25) Variants: Up to 650 L/min (171 GPM)

• Solenoid Electrical Configurations: Standard 24V DC or 220V AC available, featuring heavy-duty 3-pin Hirschmann ISO 4400 square plastic connectors equipped with integrated red LED illumination indicators.

Key Technical Advantages:

• Hydrodynamically Molded Castings with Low Pressure Drop: The primary valve bodies are poured via specialized resin-bonded sand molding techniques, utilizing interior oil channels mapped with Computational Fluid Dynamics (CFD). At peak flow scales ranging from 80 L/min to 650 L/min, internal flow pressure drop is reduced by 15% compared to low-tier generic machined housings, mitigating fluid turbulence and pipe humming.

• Wet-Pin Heavy-Duty AC/DC Solenoid Assemblies: Features encapsulated armature tubes where the sliding plunger operates submerged directly in hydraulic oil, leveraging fluid cushioning to provide self-lubrication and shock absorption. The outer coil windings are vacuum-molded in heavy-duty insulating resin compound providing IP65 ingress protection, an H-class thermal rating, and resistance against over-temperature breakdown during extended cycles.

• Super-Finished Metering Spools with Integrated Oil Balance Grooves: The directional sliding spools are machined from high-tensile alloy steel hardened via multi-stage vacuum heat treatments to a depth profile of HRC 58-62. Precision-ground micron-scale balancing rings are cut across the spool lands to distribute radial fluid pressure uniformly, eliminating hydraulic binding under high-pressure holding states while keeping internal standby leakage rates within factory standards.

• Adjustable Hydro-Mechanical Pilot Choke Block Modules (4WEH Series): For the high-capacity Size 16 and Size 25 configurations, a specialized pilot control sequence is mounted to the upper surface. The internal pilot fluid passages contain an integrated double-check throttle choke block module (stroke adjuster), allowing technicians to modify main spool shifting speeds manually to prevent severe hydraulic pipeline fluid hammer vibrations when moving heavy actuators.

Application Areas:

• Heavy Industrial Hydraulic Power Stations: Providing master directional sequencing inside steel plant blast-furnace actuators, multi-axis die casting equipment, and high-tonnage scrap recycling balers.

• High-Frequency Automotive Plastic Injection Machinery: Directing rapid ejector cylinder movements, mold core positioning sub-circuits, and fast clamping safety loops.

• Civil Engineering Tunnelling Shields & Heavy Mobile Cranes: Managing cutter-head thruster cylinder sub-circuits on tunnel boring machines and piloting outrigger stabilization blocks on all-terrain crane vehicles.

Expert Maintenance Tips:

• Never Power an AC Solenoid Coil Disassembled from the Armature Tube: For alternative current models like the 4DWG6G60/AC220, if the AC coil is energized while separated from the valve’s steel armature tube (or if the internal spool is jammed completely by debris), the inductive reactance drops to near zero. This triggers an immediate, multi-fold surge in excitation electrical current, causing the coil to overheat, emit smoke, and burn out within 5 to 10 seconds. Ensure mechanical freedom and complete assembly seating prior to powering the control loop.

• Verify Internal/External Pilot and Drain Plugs on 4WEH Units: Prior to mounting a replacement 4WEH16 or 4WEH25 pilot-operated valve, remove the alignment plugs on the bottom face of the pilot block to check whether the X-port (pilot supply) and Y-port (pilot drain) are configured for internal or external routing. Installing an internally drained valve configuration onto a subplate lacking a corresponding tank relief pathway blocks pilot oil discharge, rendering the main spool unresponsive to solenoid signals.

• Strict Fluid Filtration Protocols to Prevent High-Frequency Sticking: Because the radial clearance boundary between the precision sliding spool and the inner body bore ranges from only 6 to 12 microns, the assembly is sensitive to microscopic hard contamination particles. Total system oil cleanliness must be strictly maintained at or above ISO 4406 20/18/15. Allowing varnish sludge, oxidized carbon soot, or fine wear debris to settle in the fluid increases radial stiction, causing slow shifting response or failing to spring-center.