4WRTE16V200L-44 Rexroth Proportional Valve 350Bar

Product Overview

The 4WRTE16V200L-44/6EG24K31/A5M (Material Part Numbers MNR: R901273425 / R901325866, belonging to the high-response 4WRTE series covering NG10 to NG35) is a pilot-operated, two-stage proportional directional control valve. It features On-Board Electronics (OBE), internal electrical closed-loop spool position feedback, and an integrated spool position monitoring system (M code). Manufactured in strict compliance with Bosch Rexroth original engineering specifications and ISO 4401-07 (CETOP 7) mounting standards, this valve offers 100% drop-in mechanical, hydraulic, and electrical interchangeability. Built with a high-tensile ductile iron housing and induction-hardened spools, it delivers ultra-high dynamic frequency response, minimal hysteresis ($< 0.1\%$), and exceptional linearity under working pressures up to 350 bar. Every valve undergoes 100% factory bench testing under simulated full-load and high-frequency conditions to serve as a reliable, direct plug-and-play replacement for OEM valves.

Technical Specifications 

• Full Model Code: 4WRTE16V200L-44/6EG24K31/A5M (Part Numbers: R901273425 / R901325866)

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

• Nominal Flow Rate: 200 L/min (at valve pressure drop $\Delta p = 5\ \text{bar}$, V-spool progressive characteristic)

• Max Operating Pressure (Ports A, B, P): 350 bar (35 MPa)

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

• Electronics & Power Supply: Integrated OBE amplifier, 24V DC supply (G24), 4 – 20 mA command signal (A5)

• Pilot Oil Configuration: 6E (Internal pilot oil supply, external pilot oil drain)

• Position Feedback: Inductive spool position sensor with active position monitoring (M)

• Electrical Connector: 7-pin (6+PE) connector per EN 175201-804 (K31)

• Seals & Net Weight: NBR seals, net weight approx. 12.14 kg

Key Technical Advantages

• 100% Drop-In OEM Fit: Subplate mounting patterns, port locations, and 7-pin electrical pinouts strictly match OEM specifications, enabling immediate field installation without PLC program adjustments or hydraulic re-piping.

• Dual Closed-Loop Feedback & Minimal Hysteresis: Both the pilot and main stages incorporate high-precision LVDT transducers. Hysteresis is maintained below 0.1%, offering fine metering and high dynamic control accuracy.

• Induction-Hardened Spool & Cavitation Resistance: Spool and sleeve components are crafted from specialized alloy steel and surface-hardened ($> 60\ \text{HRC}$) to prevent silting-induced sticking and fluid erosion under high-pressure differential flows.

• 100% Simulated Load Bench Tested: Every unit is validated on automated test benches for 350 bar pressure capability, step response times, dynamic flow profiling, and zero-point leakage, guaranteeing zero-defect reliability.

Application Areas

• Industrial Presses & Forging: High-tonnage servo press controls, stamping press rams, and closed-loop position/force control loops.

• Metallurgy & Steel Mills: Continuous casting mold oscillator drives and rolling mill AGC (Automatic Gauge Control) servo circuits.

• Plastics & Injection Molding: High-speed precision injection velocity control and mold clamp servo systems.

• Marine & Test Benches: Ship roll stabilizer hydraulics, multi-axis seismic test tables, and aerospace fatigue test rigs.

Expert Maintenance Tips

• Low Pilot Drain Backpressure (Y Port): Under the 6E configuration (external pilot drain), ensure the Y port line is connected directly back to the fluid tank without restriction. Backpressure must strictly stay under 2 bar to avoid disrupting pilot zero-balance.

• Maintain High Fluid Cleanliness: Closed-loop servo-proportional valves are highly sensitive to particle contamination. Fluid cleanliness must be strictly maintained to ISO 4406 15/13/10 (NAS Class 4-5) or better, with a high-pressure inline filter ($\le 6\ \mu\text{m}$) installed upstream of the P port.

• Cable Shielding & Grounding: For the 4-20 mA control signal (A5 code), use twisted-pair shielded cables and ground the shield at a single point in the main cabinet to prevent electromagnetic interference (EMI) from affecting spool positioning.