Bosch Rexroth | H-4WEH16E7X6EW110N9ETK4B08D3
H-4WEH16E7X/6EW110N9ETK4/B08D3
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The H-4WEH16E7X/6EW110N9ETK4/B08D3 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is used to switch hydraulic flow paths in automated machinery. As a 4-way model, it can direct pressure to two actuator ports and return flow to tank, enabling bidirectional cylinder or motor control. Its NG16 hydraulic size defines a nominal flow section suitable for medium-capacity circuits, while the ISO 4401-07-07-0-05 porting pattern allows direct mounting on standardized subplates. A spring-centered spool return recenters the element when solenoids are de-energized so actuators default to a neutral position without external force. The assembly tolerates line pressures up to 350 bar on ports P, A, and B, which covers most industrial power units. Acceptable oil viscosity spans 2.8 to 500 mm²/s, giving designers freedom to run light startup fluids or heavy-duty lubricants. To protect internal clearances, inlet fluid must meet an ISO 4406 class of 20/18/15, guarding against premature wear.
A high-power 6E pilot valve energizes the main spool, providing fast shift times when electrical control is needed. Pilot oil is routed internally on both X and Y, so no external pilot lines are required. The pilot stage operates between 14 bar minimum and 250 bar maximum, ensuring reliable actuation across common supply variations. A D3 pressure-reducing valve limits secondary pressure to 45 bar, preventing overload of downstream pilot circuitry. A Ø0.8 mm throttle insert meters flow to damp switching shocks and reduce noise. Electrical connection is made through a DIN EN 175301-803 K4 plug, simplifying replacement in field service. A concealed N9 manual override lets maintenance staff shift the spool mechanically during commissioning or power loss without exposing the internal mechanism to contamination.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Size
NG16
Manual Override
Concealed (N9)
Max Operating Pressure (p/a/b)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
14 bar
Pilot Oil
ET (X Internal, Y Internal)
Pilot Valve
6E High-Power
Porting Pattern
ISO 4401-07-07-0-05
Pressure Reducing Valve
D3 (45 bar Secondary)
Spool Return
Spring-Centered
Throttle Insert
Ø 0.8 mm (B08)
Valve Type
4-Way
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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