Bosch Rexroth | H-4WEH22R7X6EG24N9ETK4B08N08D3
H-4WEH22R7X/6EG24N9ETK4/B08N08D3
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The H-4WEH22R7X/6EG24N9ETK4/B08N08D3 valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series. Intended for hydraulic automation, it offers a 4/3-way function so that pressure, tank, and actuator lines can be placed in three working positions. The assembly uses spool symbol R, and the flow gallery is sized for NG25 passages, delivering balanced performance in medium-capacity circuits. Port interfaces follow the ISO 4401-08-08-0-05 pattern, providing compatibility with standardized subplates. When actuated the valve can conduct up to 450 l/min, and the pressure rating of 350 bar at ports P, A, and B supports high-pressure work circuits. Pilot oil is supplied internally through port X and returned to tank internally via port T, eliminating external pilot lines.
Control power is delivered by a 24 V DC solenoid coil that mates with a DIN EN 175301-803 connector, allowing quick disconnection during service. A concealed manual override designated N9 lets the operator shift the spool mechanically when electrical power is absent. The pilot stage endures pressures up to 210 bar, while the spring-centered design needs at least 12.5 bar to move from its neutral position. An integrated pressure-reducing element limits pilot supply to 45 bar, protecting the control passages from the higher main line pressure. Flow into the pilot gallery is metered by a 0.8 mm throttle insert coded B08, which dampens spool velocity for stable switching. To preserve internal clearances, operating fluid cleanliness must reach ISO 4406 class 20/18/15.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Coil Voltage
24 V DC
Electrical Connection
DIN EN 175301-803
Manual Override
Concealed (N9)
Max Flow (symbol R)
450 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (spring-centered)
12.5 bar
Nominal Size
NG25
Pilot Oil Return
Internal (to T)
Pilot Oil Supply
X Internal
Porting Pattern
ISO 4401-08-08-0-05
Pressure Reducing Valve Set Pressure
45 bar
Spool Symbol
R
Throttle Insert
Ø 0.8 mm (B08)
Valve Function
4/3-Way
1620 Old Apex Road
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