Bosch Rexroth | 4WEH10HD4XOF6EG96N9ES2K4
4WEH10HD4X/OF6EG96N9ES2K4
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The 4WEH10HD4X/OF6EG96N9ES2K4 directional spool valve is built by Bosch Rexroth and belongs to the WEH Directional Spool Valves series. It directs hydraulic flow in automated circuits and fits manifolds sized NG10. The valve accommodates a continuous flow rate of up to 160 l/min, which matches medium-duty actuator groups in industrial machinery. A maximum operating pressure of 350 bar is allowed at ports P, A, and B, giving a substantial force margin for high-pressure systems. It mounts to an ISO 4401-05-05-0-05 interface, and electrical actuation is provided through a DIN EN 175301-803 connector coded K4. Mechanical fastening is handled by four M6 × 45 screws compliant with ISO 4762, and each screw must be tightened to 12.5 Nm to secure the body against the manifold block. Pilot oil is supplied internally through channel E, while return flow is routed externally so that closed-center circuits do not back-pressure the pilot stage.
The pilot stage tolerates a peak pressure of 250 bar and a separate internal line Y can be loaded to 210 bar without jeopardizing spool stability. Reliable end-positioning is achieved when at least 7 bar of pilot pressure is present, and the shortest attainable switching sequence is reached when 35 l/min of pilot oil passes the control landings. For a two-spool variant, the pilot chamber encloses 4.08 cm³ of oil, a value that influences response time and damping. Switching dynamics can be trimmed through the discharge control identified as option S2, allowing installers to match valve behavior to cylinder mass and line elasticity. Functional safety is quantified by a mean time to dangerous failure of 100 years, supporting long maintenance intervals in critical plants. Together, these pilot circuit parameters complement the main stage figures listed earlier and define the operating envelope required for precise, repeatable hydraulic motion control.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (ng10, Hd)
160 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (y Internal, Dc)
210 bar
Min Pilot Pressure (hydraulic End Pos)
7 bar
Mounting Screws
4x M6 x 45 (ISO 4762)
Mttfd (type Weh)
100 years
Pilot Flow For Shortest Switching
35 l/min
Pilot Oil Return
External
Pilot Oil Supply
Internal (E)
Pilot Volume (2-spool)
4.08 cm³
Porting Pattern
ISO 4401-05-05-0-05
Screw Tightening Torque
12.5 Nm
Switching Time Adjustment
Discharge Control (S2)
Valve Size
NG10
1620 Old Apex Road
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