4WRLE 0811404090 Rexroth Proportional Directional Valve NG10-35 350bar

Product Overview

The 4WRLE series (including material number 0811404090 and sizes NG10/16/25/27/35) is a Bosch Rexroth pilot-operated proportional directional control valve featuring electrical position feedback and integrated on-board electronics (OBE). It combines a servo-quality pilot stage with a high-precision main stage spool for closed-loop position, velocity, and pressure control. Designed to ISO 4401 subplate mounting standards, the valve offers full interchangeability with original Rexroth units, requiring no modifications to piping or control systems. Every unit undergoes 100% simulated operating condition testing to guarantee reliability under high-pressure and high-flow applications. Ideal for industrial hydraulic systems demanding superior dynamic response and control accuracy.

Technical Specifications

• Model: 4WRLE series (NG10/16/25/27/35), example material number 0811404090
• Nominal sizes: NG10, NG16, NG25, NG27, NG35
• Rated flow (Δp = 5 bar per control edge): NG10 60/100 l/min; NG16 200/250 l/min; NG25 350/400 l/min; NG27 430/600 l/min; NG35 1000/1200/1500 l/min
• Maximum flow: approx. 300 l/min (NG10), 800 l/min (NG16), 1250 l/min (NG25), 1850 l/min (NG27), 4700 l/min (NG35)
• Maximum operating pressure (ports A, B, P – external pilot): 350 bar (NG27 approx. 270 bar in certain configurations)
• Maximum pressure with internal pilot (ports A, B, P): approx. 280 bar
• Port X max. pressure: approx. 280 bar; ports T/Y max. pressure: approx. 210–250 bar
• Minimum pilot pressure: approx. 10 bar
• Control: Pilot-operated proportional, with OBE and electrical position feedback; command signal ±10 V or 4–20 mA; supply 24 VDC
• Hysteresis: <0.1%
• Response sensitivity: <0.05%
• Weight: approx. 9 kg (NG10), 12 kg (NG16), 19 kg (NG25), 21 kg (NG27), 80 kg (NG35)
• Mounting: Subplate, ISO 4401 porting pattern
• Hydraulic fluid temperature range: –20…+70 °C
• Recommended viscosity: 20…100 mm²/s
• Fluid cleanliness: ISO 4406 class 18/16/13

Key Technical Advantages

• Servo-quality precision manufacturing: Pilot stage spool and sleeve produced to servo standards; main stage features high-precision lapping for minimal internal leakage and excellent volumetric efficiency.
• Outstanding dynamics and low hysteresis: Hysteresis below 0.1% and response sensitivity under 0.05%, combined with closed-loop position feedback, enable rapid and accurate flow/direction switching for high-frequency position or velocity control.
• Integrated OBE electronics: Factory-calibrated on-board electronics accept analog command signals, simplify system integration, reduce the need for external amplifiers, and provide fail-safe spool positioning.
• Robust construction and extended service life: High-strength housing with optimized bearings and seals withstands high pressure and vibration; rigorous cleanliness control and 100% simulated duty-cycle testing further enhance durability.

Application Areas

Injection molding machines, die-casting machines, metallurgical equipment, heavy-duty presses, marine steering systems, mobile equipment main control valves, large test stands, and any industrial hydraulic system requiring high-precision closed-loop position, velocity, or pressure control. Especially suitable for OEM equipment and retrofit projects demanding interchangeability and superior dynamic performance.

Expert Maintenance Tips

Verify subplate flatness and cleanliness before installation; tighten mounting bolts to the specified torque to prevent body distortion. Maintain hydraulic fluid cleanliness to ISO 4406 18/16/13 and use high-efficiency filtration. Before initial power-up, check electrical connections and proper shielding/grounding to ensure stable command signals. Periodically inspect pilot oil filters and seals to prevent contamination-induced sticking. When replacing, select a fully interchangeable unit of the same specification and perform unloaded position calibration to restore control accuracy.