4WRZE16W6-150-7X Rexroth Proportional Valve 315Bar

Product Overview

The 4WRZE16W6-150-7X/6EG24ETK31/A1/D3M is a pilot-operated, 2-stage proportional directional valve engineered for high-performance fluid control. Belonging to the Bosch Rexroth 4WRZE series (covering NG16, NG25, and NG32 industrial frames), this valve features On-Board Electronics (OBE) that drive a high-precision proportional solenoid pilot stage, allowing for stepless control of fluid direction and flow rate. Manufactured strictly to ISO 4401-07 (CETOP 7) mounting standards, it guarantees 100% mechanical, hydraulic, and electrical drop-in interchangeability. Constructed with a high-strength cast iron body and precision-matched hardened spools, it delivers exceptional dynamic response and extremely low hysteresis even under operating pressures up to 315 bar. Every single unit undergoes 100% rigorous factory bench testing under simulated maximum load and dynamic frequency conditions, ensuring it serves as a flawless, direct replacement for original Rexroth components.

Technical Specifications

• Full Model Code: 4WRZE16W6-150-7X/6EG24ETK31/A1/D3M (Series cross-compatibility: 4WRZE16, 4WRZE25, 4WRZE32)

• Nominal Size (NG): NG16 / CETOP 7 / ISO 4401-07-07-0-05

• Nominal Flow Rate: 150 L/min (at valve pressure drop $\Delta p = 10\ \text{bar}$)

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

• Max Tank Return Pressure (Port T): 250 bar

• Electronics & Power Supply: Integrated On-Board Electronics (OBE), 24V DC supply (G24), $\pm 10\ \text{V}$ command signal (A1)

• Pilot Oil Configuration: D3 (Internal pilot supply, external pilot drain)

• Electrical Connection: 7-pin (6+PE) connector (K31 standard)

• Seal Material & Temp Range: NBR seals (M code), operating temperature -20°C to +80°C

• Net Weight: Approx. 8.7 kg

Key Technical Advantages

• 100% Drop-In OEM Interchangeability: Subplate mounting patterns, port geometry, and 7-pin electrical pinouts are identical to original OEM specifications, enabling instant plug-and-play installation without piping or wiring modifications.

• Integrated OBE for High Dynamics: The pre-calibrated On-Board Electronics eliminate the need for an external amplifier card, minimizing signal noise and deadband while delivering extremely low hysteresis ($< 0.5\%$) for linear flow control.

• Induction-Hardened Spool Assembly: Both the main spool and sleeve are manufactured from specialized alloy steel and induction-hardened (hardness $> 60\ \text{HRC}$) to combat cavitation erosion and silting-induced sticking under high-velocity flow conditions.

• 100% Simulated Load Bench Tested: Prior to dispatch, every valve is fully evaluated on an automated test stand for 315 bar pressure holding, dynamic step response, internal leakage, and performance curve profiling to guarantee zero-defect field reliability.

Application Areas

• Metallurgy & Steel Mills: Continuous casting oscillator control, rolling mill screw-down mechanisms, and strip guiding servo circuits.

• Plastics & Injection Molding: High-speed injection velocity regulation, mold clamping pressure control, and large extruder drives.

• Industrial Presses: High-tonnage hydraulic press ram synchronization and precise die-cushion position control.

• Marine & Offshore Engineering: Ship stabilizers, full-azimuth thruster hydraulic power units, and heavy deck lifting equipment.

Expert Maintenance Tips

• Manage Pilot Drain Backpressure (Y Port): Since this valve utilizes a D3 configuration (external pilot drain), ensure the Y port line is routed directly to the reservoir. Backpressure must not exceed 2 bar; excessive pressure will slow pilot response or cause main spool positioning errors.

• Maintain Strict Fluid Cleanliness: Proportional valves with OBE are highly sensitive to particle contamination. The system hydraulic fluid must be rigorously maintained at ISO 4406 16/14/11 (NAS Class 5) or cleaner. An inline high-pressure filter ($\le 10\ \mu\text{m}$) upstream of the P port is highly recommended.

• Ensure Proper Signal Shielding: To protect the sensitive OBE amplifier from industrial electromagnetic interference (EMI), always use a fully shielded 7-pin cable for the $\pm 10\ \text{V}$ command signal, and ground the shield only once at the main electrical cabinet.