R900700633 4WRZE16W8-150-7X/6EG24N9ETK31/A1D3M German hydraulic proportional directional valve Rexroth

Key Differences & Selection Guide

1. Q: What is the main difference between the W8-spool and the previous W6-spool?

   A:​ The W8-spool​ has a different overlap and transition characteristic compared to the W6. While both are overlap spools for smooth operation, the W8 typically offers a specific P-A/B and B-T/A transition pattern. Refer to the Rexroth symbol sheet for the exact flow path characteristic.

2. Q: What does the /A1D3M suffix mean?

   A:​ The /A1​ suffix indicates ±10 V DC voltage control input. The /D3​ suffix indicates an integrated pressure reducing valve (ZDR 6)​ for regulating pilot pressure. The /M​ suffix specifies standard NBR seals.

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

   A:​ This valve (/6EG24N9ETK31) uses internal pilot oil supply (from main P port)​ but requires an external pilot oil return (Y port). This is different from the "ET" configuration (internal drain to T) and requires you to connect the Y port directly to the tank with minimal backpressure (max 30 bar).

4. Q: Why choose this specific configuration?

   A:​ This model is ideal for applications requiring smooth control (W8 spool) with the simplicity of internal pilot supply. The ±10 V control (/A1)​ is common for PLC analog outputs. The integrated /D3 pressure reducer​ protects the pilot stage from system pressure fluctuations.

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 30 bar to ensure proper pilot valve function. The main T-port backpressure must be below 210 bar. Maintain high oil cleanliness (recommended NAS 1638 Class 8 or better for the main stage).