REXROTH 4WS2EM10-40 is a high-precision two-stage nozzle-flapper four-way servo valve under Bosch Rexroth NG10 (size 10) series, designed for closed-loop precise control of hydraulic position, velocity, force and pressure. It is widely applied in metallurgical rolling mills, injection molding machinery, aerospace test benches, marine hydraulic thruster systems, heavy-duty industrial test rigs and offshore hydraulic actuators. 4WS2EM10-40 converts ±mA analog control signals from servo amplifiers into proportional spool displacement, delivering accurate hydraulic flow regulation for high-response precision motion loops, serving as a core obsolete high-end hydraulic spare component for precision automation equipment maintenance. Hydraulic control engineers rely on REXROTH 4WS2EM10-40 to achieve ultra-low hysteresis, fast dynamic response and stable long-term operation under heavy vibration, wide temperature and high-pressure industrial environments.
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Core Procurement & Technical Specifications
- Brand: REXROTH (Bosch Rexroth Hydraulics)
- Model: 4WS2EM10-40
- Availability: In stock, limited original genuine surplus inventory
- Delivery Time: Within 3 working days after payment confirmation
- Warranty: 12-month full functional warranty
- Condition: Original brand new surplus, unused, complete factory calibrated packaging
- Control Principle: 2-stage design; 1st stage torque motor + nozzle-flapper pilot amplifier; 2nd stage precision four-way spool with mechanical spring feedback
- Input Signal: ±10mA standard analog command signal, matched with external independent servo amplifier
- Rated Flow: 40 L/min (valve pressure differential 70 bar, tolerance ±10%)
- Pressure Parameters: Max supply pressure P=315 bar; internal pilot return T static pressure ≤10 bar
- Mounting Standard: ISO 4401-05 subplate mounting interface
- Hysteresis: ≤1.5% (with dither signal optimization)
- Operating Temperature: -20°C ~ +85°C; hydraulic fluid temperature -15°C ~ +80°C
- Fluid Cleanliness: Requires ISO 4406 18/16/13 or higher cleanliness grade
- Enclosure & Protection: Sealed aluminum housing, built-in external replaceable pilot filter
- Dynamic Performance: Fast step response, wide frequency bandwidth for high-speed precision motion control
- Hazardous Certifications: Optional ATEX/IECEx explosion-proof certification for explosive industrial and offshore zones
- Feedback Structure: Mechanical torsion spring feedback, wear-free spool positioning without mechanical linkage abrasion
Key Advantages
- Nozzle-flapper two-stage structure with mechanical feedback, ultra-small dead zone and low hysteresis, realizing micron-level precise hydraulic flow control
- NG10 standard ISO 4401 mounting interface, universal compatibility with most industrial hydraulic servo actuator platforms, direct replacement without manifold modification
- High dynamic response and wide frequency bandwidth, perfectly matches high-speed reciprocating, positioning and force closed-loop control systems
- External pilot filter design, convenient on-site disassembly and cleaning to reduce contamination-induced valve failure downtime
- Wide temperature and high-pressure resistant design, stable continuous 24/7 operation in metallurgy, marine and heavy industrial precision hydraulic stations
