R900939990 Z4WE6E68-3X/EG24K4 Hydraulic valve, Rexroth solenoid valve, directional valve

Rexroth Z4WE6E68-3X/EG24K4 Solenoid Directional Valve - Technical Specifications

FAQs for Rexroth Z4WE6E68-3X/EG24K4 Solenoid Valve

1. Q: What does the "Z" prefix in the model number mean?

   A:​ The "Z" prefix indicates that this valve is a high-performance, pilot-operated directional control valve. It uses a small, low-power solenoid to hydraulically pilot a larger main spool, allowing for the control of high flows with a compact and energy-efficient electric actuator.

2. Q: How is a 4/2-way valve different from the 4/3-way valves seen in previous models?

   A:​ A 4/2-way valve has two working positions instead of three. It lacks a defined neutral center position. When de-energized, it remains in one of its two positions (often held by a spring), and it shifts to the other position only when the solenoid is energized. It is typically used for applications like single-acting cylinders or simpler double-acting cylinder control where a neutral "hold" function is not required.

3. Q: What is the function of the "E68" spool designation?

   A:​ The "E68" refers to the specific, pre-defined flow path geometry of the main spool. It defines how the P, A, B, and T ports are connected internally in each of the valve's two positions. The exact flow characteristics (like overlap, gradient) are optimized for specific performance criteria. The precise schematic for this spool must be checked in the official technical documentation.

4. Q: The valve is not shifting. I've checked power and the manual override works. What's next?

   A:​ Since this is a pilot-operated valve, the main spool requires sufficient pilot pressure to shift. First, ensure the pilot pressure supply (usually labeled 'X' or from an internal feed) is present and meets the minimum pressure requirement specified in the datasheet. Also, check for contamination that could block the small pilot orifices or cause the main spool to stick.

5. Q: Can I use a standard WE6 series coil on this valve, or is it different?

   A:​ The electrical interface (DIN 43650 plug) is standard, but the coil itself is designed for the specific solenoid used in this pilot-operated valve series. You must use the correct replacement coil part number, typically based on the "EG24K4" electrical code. Using an incorrect coil, even with the same voltage, may not provide the required force or performance.