Bosch Rexroth | 4WEH16E7X6EG24N9K4
4WEH16E7X/6EG24N9K4
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The 4WEH16E7X/6EG24N9K4 directional spool valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic oil in automated systems where electrically commanded pilot flow shifts a main NG16 spool for machine functions. The valve uses electro-hydraulic actuation so a small pilot stage moves the main spool under hydraulic power to reduce coil energy. A 4-way flow circuit provides two actuator ports along with pressure and tank lines, while spool symbol E specifies the flow paths established in each energized position. The spool reverts to center by a spring-centered mechanism, ensuring neutral blocking when power is removed. Interface mounting follows the ISO 4401-07-07-0-05 porting pattern so it mates with standardized subplates. Rated voltage of 24 V DC energizes the pilot solenoids, and the connection is made through a DIN EN 175301-803 K4 plug to fit common wiring looms.
For fast switching, the pilot stage requires 35 l/min, and it develops full shift speed once pilot pressure reaches at least 14 bar. Main flow capacity for an NG16 valve with symbol E is 300 l/min, covering medium-size actuators. The valve withstands operating pressure up to 280 bar on ports P, A, and B, while pilot passages tolerate 250 bar and return line Y can accept 210 bar, so internal components stay within safety limits across typical circuits. A concealed N9 manual override allows maintenance personnel to shift the spool without electrical power. Total mass with two solenoids and the spring return assembly is 8.9 kg, which supports rigid mounting yet still permits handling by one technician.
Technical Specifications
Actuation Type
Electro-Hydraulic
Centering Method
Spring-Centered
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (ng16, Symbol E)
300 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y, Dc)
210 bar
Min Pilot Pressure (spring-centered)
14 bar
Nominal Size
NG16
Pilot Flow For Fastest Switching
35 l/min
Porting Pattern
ISO 4401-07-07-0-05
Rated Voltage
24 V DC
Spool Symbol
E
Valve Way
4-Way
Weight (2 Solenoids, Spring-centered)
8.9 kg
1620 Old Apex Road
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