Bosch Rexroth | 4WEH22T7X6EW110N9ETK4B08P4-5
4WEH22T7X/6EW110N9ETK4/B08P4 5
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The 4WEH22T7X/6EW110N9ETK4/B08P4 5 directional valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series to direct flow in automated hydraulic manifolds. It uses electro-hydraulic actuation so an electrical pilot solenoid shifts the main spool without manual intervention. The body is built to the NG25 size and installs on a subplate, while the porting pattern follows ISO 4401 for interchangeability with standard blocks. A 4-way, 3-position function provides two service ports plus pressure and tank, and the spool designated by symbol T defines the center flow relationship used during standby. Pilot oil supply and return are both internal, eliminating external lines in compact circuits. Electrical connection is made through a DIN EN 175301-803 K4 plug, and a concealed manual override allows local shifting when the control circuit is de-energized.
System limits are defined by a maximum operating pressure of 280 bar at ports P, A, and B, so the valve can run directly on high-pressure power units common in industrial automation. The pilot stage tolerates up to 210 bar supply pressure, while the internal return path is rated for 160 bar, maintaining controlled spool movement even when back-pressure builds in the tank line. A minimum pilot pressure of 4.5 bar must be reached before the pilot poppet opens, the same figure used as the preload valve cracking pressure that guards against unintended shifts caused by vibration. Flow entering the pilot chamber is throttled by a 0.8 mm orifice, which damps pressure spikes and ensures predictable response times throughout the working range.
Technical Specifications
Actuation
Electro-Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (y Internal, Ac)
160 bar
Min Pilot Pressure (x Internal)
4.5 bar
Mounting
Subplate
Pilot Oil Return
Internal
Pilot Oil Supply
Internal
Pilot Orifice Diameter
0.8 mm
Porting Pattern
ISO 4401
Preload Valve Cracking Pressure
4.5 bar
Size
NG25
Spool Symbol
T
Valve Function
4-Way, 3-Position
1620 Old Apex Road
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