Bosch Rexroth | H-4WEH16U7X6EG24N9ETK4B08D3Z
H-4WEH16U7X/6EG24N9ETK4/B08D3Z
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The H-4WEH16U7X/6EG24N9ETK4/B08D3Z valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and provides electro-hydraulic actuation for automated hydraulic circuits. Its nominal size of NG16 establishes the flow capacity expected for mid-frame machinery, while spool symbol U defines the connection pattern that the system sees in neutral. Three spool positions permit forward flow, reverse flow, or closed center operation as required by the controller. A 6E high-power pilot valve supplies the force needed to shift the main spool, and the internal X pilot supply removes the need for an external pilot line. Return oil leaves through the internal Y path to simplify tank piping. The spool centers reliably when pilot pressure falls below the 14 bar minimum, and a 24 V DC coil energizes the solenoid so it matches common industrial control voltage.
Maximum operating pressure of 350 bar on ports P, A, and B allows the valve to handle high-pressure work circuits, while the pilot stage tolerates up to 250 bar so pilot components remain within their stress limits. The Y port may carry 210 bar, letting return flow remain under pressure when the tank line is restricted. A D3 secondary pressure value of 45 bar maintains a controlled back-pressure in the pilot exhaust path. The 0.8 mm throttle insert orifice moderates pilot flow to prevent spool overshoot during rapid shifts. Electrical connection is made through a DIN EN 175301-803 K4 plug for straightforward field wiring, and a concealed N9 manual override gives service personnel a way to shift the valve during setup without leaving exposed actuators.
Technical Specifications
Actuation
Electro-Hydraulic
Coil Voltage
24 V DC
D3 Secondary Pressure
45 bar
Electrical Connector
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p/a/b)
350 bar
Max Pilot Pressure
250 bar
Max Y Port Pressure (dc)
210 bar
Min Pilot Pressure
14 bar (X internal, spring-centered)
Nominal Size
NG16
Pilot Return
Internal (Y)
Pilot Supply
Internal (X)
Pilot Valve Type
6E High-Power
Spool Positions
3
Spool Symbol
U
Throttle Insert Orifice
0.8 mm (B08)
1620 Old Apex Road
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