R901202900 4WRKE10W6-25L-3X/6EG24ETK31/F1D3M German Rexroth hydraulic proportional solenoid directional valve

FAQ:

1. Q: What is the main difference between 4WRKE and the previous 4WRZE valves?

   A:​ The 4WRKE series​ features electrical position feedback (/ET)​ of the main spool, which allows for closed-loop position control. This provides higher accuracy and repeatability compared to the open-loop 4WRZE series. Additionally, this model is NG10 size, making it suitable for lower flow applications (25 L/min rated) than the NG25/32 valves.

2. Q: How does the pilot oil configuration work?

   A:​ This valve (/6EG24ETK31) uses external pilot oil supply (X port) and external pilot oil return (Y port). You must provide clean, filtered pilot oil to the X port (typically 25–315 bar) and ensure the Y port drains directly to the tank with minimal backpressure (max 10 bar).

3. Q: Why choose the /F1 version?

   A:​ The /F1​ suffix (4–20 mA current input) is ideal for noisy industrial environments​ or when the control signal must travel long distances. It is less susceptible to voltage drop and electromagnetic interference than voltage signals (±10 V).

4. Q: What is the role of the /D3 pressure reducing valve?

   A:​ The /D3​ option is an integrated, fixed-setting pressure reducing valve (ZDR 6). It ensures the pilot stage receives a stable, reduced pressure (typically around 40 bar), protecting the sensitive pilot valve from high and fluctuating main system pressures.

5. Q: What is the critical installation note?

   A:​ You must connect the external pilot drain (Y port) directly to the tank​ with a dedicated line. Backpressure on the Y port must be below 10 bar​ to ensure proper pilot valve function. Provide clean, regulated pilot pressure to the X port. Maintain high oil cleanliness (recommended NAS 1638 Class 8 or ISO 4406 20/18/15 for the main stage).