R900704245 4WRKE10W6-100L-3X/6EG24ETK31/A1D3M Proportional hydraulic solenoid directional valve from Rexroth, Germany

FAQ:

1. Q: What is the main difference between this valve and the previous R901202900?

   A:​ This valve (R900704245) has a higher rated flow (100 L/min vs. 25 L/min)​ and uses a ±10 V voltage control signal (/A1), whereas R901202900 uses a 4–20 mA current signal (/F1). Both are NG10 size with electrical position feedback (/ET).

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 /A1 version?

   A:​ The /A1​ suffix (±10 V voltage input) is ideal for high-precision control systems​ (e.g., servo controllers, motion controllers) where fine resolution and fast signal response are required. It is commonly used in closed-loop systems with additional external feedback.

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).