Rexroth R900772317 Servo Valve 4WS2EM 10-52/60B11T315K3

Rexroth 4WS2EM 10-52/60B11T315K3 Servo Valve (R900772317)

The Rexroth 4WS2EM 10-52/60B11T315K3 (Part Number: R900772317) is a 2-stage directional servo valve that works electrically and is installed on a subplate. This valve has excellent dynamic responsiveness and great positioning accuracy via an innovative electro-mechanical converter (torque motor) coupled with a precise hydraulic amplifier of the nozzle flapper plate type.

It is designed for precise closed-loop control loops and controls location, force, velocity and pressure with great fidelity. The mechanical feedback system via a unique bending spring ensures that the control spool aligns properly with the analogue input signal, giving reliable performance in demanding industrial and maritime automation situations.

Model Details:

• Brand: Bosch Rexroth
• Model Code: 4WS2EM 10-52/60B11T315K3
• Manufacturer Part Number (MPN): R900772317
• Serial/Production Marks: MA18700095-A95/0030, P0033642900

Applications

1. Marine Engine Control & Steering Gear: Controls accurate positioning systems on governor actuators, variable pitch propeller systems and electro-hydraulic steering assemblies.
2. Controls main fuel throttle control valves and high speed safety trip bypass mechanisms.Industrial Steam & Gas Turbine Controls:
3. Heavy Infrastructure Systems Drives positioning rams for marine deck cranes, winches, offshore drilling machines and stabiliser fins
4. High-Response Industrial Automation: Commonly used in plastics injection moulding machines, die casting machines and metal forming presses that require high precision speed and force profiles.

Engineer Expert’s Guide:

1) Absolute Fluid Cleanliness is Non-Negotiable: Critical Alert: Servo valves with nozzle-flapper pilot stages feature exceptionally tight internal clearances (often down to 5 microns). Over 80% of premature failures are caused by particulate contamination blocking the pilot nozzles.

2) Flushing Plate Protocol:  When commissioning a new system, rebuilding an actuator, or doing a complete oil change, do not mount this valve initially. Use a blanking/flushing plate to loop the pressure line directly to the return line and run the flushing pumps for at least 24 hours. Only bolt on the R900772317 valve once the system fluid test passes standard criteria.

3) External Electronics & Dither Tuning: Since the 4WS2EM model relies on external servo amplifiers rather than onboard electronics (OBE), your command output depends on external calibration.

Ensure your servo card is configured with a subtle dither frequency (typically around 200 Hz to 400 Hz). Proper dither introduces a microscopic high-frequency vibration to the spool, breaking static friction (stiction) without altering the macro-flow rate, resulting in ultra-smooth response loops.