Bosch Rexroth | H-4WEH22HD7XOF6EW110N9ETK4B12
H-4WEH22HD7X/OF6EW110N9ETK4/B12
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The H-4WEH22HD7X/OF6EW110N9ETK4/B12 directional valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation tasks where high flow must be routed quickly and precisely. The body is produced in nominal size NG25 so it mates with medium-capacity sub-plates used in industrial power units. Inside, a spool cut to symbol D provides two discrete positions, allowing the operator to switch flow between only two circuit states. Mounting follows the ISO 4401-08-08-0-05 porting pattern, which standardizes passage locations and seal dimensions. With this configuration the valve can pass up to 450 l/min, supporting large cylinders or motors. Work ports p, a, and b tolerate operating pressures up to 350 bar, giving a broad safety margin for heavy-duty equipment. Pilot oil is taken from the pressure port and returned internally, noted as configuration ET, and the main spool is returned hydraulically rather than by a spring.
The pilot stage is energized by a 110 V AC coil that functions on either 50 or 60 Hz lines, and it connects through a DIN EN 175301-803 K4 plug for straightforward wiring. A concealed N9 manual override lets maintenance crews shift the spool without electrical power during setup or fault finding. Pilot supply must stay between 8 bar and 210 bar, while the internal pilot return path can withstand up to 160 bar, ensuring consistent actuation even when back-pressure rises in the tank line. System cleanliness must meet ISO 4406 (c) 20/18/15 so that sliding lands do not score or stick. For additional damping, a B12 throttle insert with a 1.2 mm orifice can be fitted in the pressure passage to limit surge flow. Together these electrical, hydraulic, and contamination limits define the operating envelope and allow the valve to integrate into automated power units that require reliable spool control.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Coil Voltage
110 V AC (50/60 Hz)
Electrical Connection
DIN EN 175301-803 (K4)
Main Valve Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol D)
450 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (internal)
160 bar
Min Pilot Pressure
8 bar
Nominal Size
NG25
Pilot Oil Configuration
Internal Supply, Internal Return (ET)
Porting Pattern
ISO 4401-08-08-0-05
Spool Positions
2
Spool Symbol
D
Throttle Insert
Ø1.2 mm (B12)
1620 Old Apex Road
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