Bosch Rexroth | 4WEH22D7X6EW110N9DK25L
4WEH22D7X/6EW110N9DK25L
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The 4WEH22D7X/6EW110N9DK25L directional valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. Designed for hydraulic automation systems, it guides pressurized fluid based on electrical commands. Electro-hydraulic actuation couples a solenoid pilot stage with the main spool so electrical control signals can stroke the valve under load. The configuration is 4-way, giving one pressure port, one tank port, and two work ports for reversible actuator control. A nominal size of NG25 provides passage dimensions large enough for machinery that needs substantial flow. Spool symbol D defines the flow paths when the valve is energized or de-energized, while two discrete spool positions toggle between those paths. The performance limit flow of 450 l/min indicates the highest flow rate the valve can handle without exceeding its pressure drop limits. An ISO 4401-08-08-0-05 mounting interface permits direct stacking on standard subplates, and a 110 VAC 50/60 Hz coil voltage connects directly to common industrial power.
High-power pilot valve type 6E supplies increased pilot oil to shift the main spool quickly in demanding cycles. Internal pilot oil supply X draws control fluid from the pressure port, simplifying plumbing, and external pilot oil return Y directs pilot discharge to tank to keep back pressure low. The valve sustains a maximum operating pressure of 280 bar on ports P, A, and B, enabling operation in high-pressure circuits. The pilot stage tolerates up to 210 bar, and it requires at least 11 bar to move the spool reliably; both limits protect the pilot components. A maximum pilot return pressure of 160 bar applies to the Y port when the unit is powered by alternating current, guarding against excessive back pressure. A concealed manual override coded N9 lets maintenance personnel shift the valve mechanically during testing or power loss without exposing the override to accidental actuation.
Technical Specifications
Actuation
Electro-Hydraulic (WEH)
Coil Voltage
110 VAC (50/60 Hz)
Manual Override
Concealed (N9)
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (y)
160 bar (AC)
Min Pilot Pressure
11 bar
Mounting Interface
ISO 4401-08-08-0-05
Nominal Size
NG25 (W.H 22)
Performance Limit Flow (symbol D)
450 l/min
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (X)
Pilot Valve Type
6E (High-Power)
Spool Positions
2 Positions
Spool Symbol
D
Way Configuration
4-Way
1620 Old Apex Road
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