Bosch Rexroth | Z4WE6E68-21AG24Z5L2QAG24
Z4WE6E68-21/AG24Z5L2QAG24
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The Z4WE6E68-21/AG24Z5L2QAG24 directional spool valve belongs to the WE Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation systems. With a valve size of 6 it fits compact D03 manifolds, and the NFPA T3.5.1 R2-2002 D03 mounting interface aligns with standard subplates to simplify installation. The ISO 4401-03-02-0-05 porting pattern keeps passage alignment consistent with other modular components. During operation the spool handles flows up to 80 l/min while maintaining a maximum operating pressure of 350 bar across ports p, a, and b. The solenoid accepts a supply that may vary by ±10 % without loss of function and draws 30 W at nominal direct current. Continuous energization is allowed because the duty cycle is 100 %, letting the valve stay shifted for extended periods in machine cycles.
The valve cycles rapidly in servo loops; the solenoid can switch 4.2 times per second and tolerates 500 V of switch-off overvoltage produced by inductive kickback. Coil winding insulation corresponds to class F and the surface temperature may reach 120 °C under sustained load, features that prevent thermal degradation when ambient temperatures rise. Manual override operations are limited to 50 bar in the tank line, and the tank port itself withstands pressures up to 210 bar during transients. System cleanliness must be kept to ISO 4406 20/18/15 so the spool remains free of abrasive wear, a requirement that protects lands and seals. With a mean time to dangerous failure of 300 years the component offers long statistical reliability, making it a stable element in closed-loop hydraulic circuits.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Duty Cycle
100%
Insulation Class (dc)
F
Manual Override Tank Pressure Limit
50 bar
Max Coil Surface Temperature (dc)
120 °C
Max Flow (dc)
80 l/min
Max Operating Pressure (p/a/b)
350 bar
Max Switch-off Overvoltage (dc)
500 V
Max Switching Frequency (dc)
4.2 1/s
Max Tank Port Pressure (dc)
210 bar
Mounting Interface
NFPA T3.5.1 R2-2002 D03
Mttfd
300 years
Nominal Power (dc Standard)
30 W
Porting Pattern
ISO 4401-03-02-0-05
Valve Size
6
Voltage Tolerance
±10%
1620 Old Apex Road
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