Bosch Rexroth | Z4WE6E68-21AG4N9K4
Z4WE6E68-21/AG4N9K4
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The Z4WE6E68-21/AG4N9K4 valve belongs to the WE Directional Spool Valves series from Bosch Rexroth and is intended to control flow paths in hydraulic automation circuits. It is built in valve size 6 and uses spool symbol E to establish its switching positions, providing predictable actuation for pressure lines p, a, and b. The wet-pin solenoid with a detachable coil simplifies replacement while isolating the magnetic system from hydraulic fluid. Electrical connection is accomplished through a DIN EN 175301-803 Form A plug coded K4, and the coil accepts supply levels within a ±10 % voltage band to tolerate normal line variation. Continuous energization is possible because the solenoid is rated for a 100 % duty cycle, and the assembly withstands operating pressures up to 350 bar in the working ports.
The hydraulic system feeding this valve must meet ISO 4406 cleanliness class 20/18/15 to keep the precision spool clear of particulate wear. During prolonged excitation the coil surface can reach 120 °C, so cable insulation and mounting clearances must suit this temperature. The IP65 housing prevents dust ingress and low-pressure water jets from affecting the internal components. A concealed N9 manual override allows local shifting when power is absent, with back-pressure in the tank line limited to 50 bar while the override is held. Mounting follows the NFPA D03 pattern and matches the ISO 4401-03-02-0-05 porting layout for direct stack installation. The statistical mean time to dangerous failure is 300 years, indicating high reliability in safety-related circuits.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Coil Surface Temperature
120 °C
Duty Cycle
100% ED
Electrical Connector
DIN EN 175301-803 Form A (K4)
Ingress Protection
IP65
Manual Override
N9 (Concealed)
Manual Override Tank Pressure Limit
50 bar
Max Operating Pressure (p/a/b)
350 bar
Mttfd
300 Years
Nfpa Mounting Pattern
D03
Porting Pattern
ISO 4401-03-02-0-05
Solenoid Type
Wet-Pin, Detachable Coil
Spool Symbol
E
Valve Size
6
Voltage Tolerance
±10%
1620 Old Apex Road
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