Bosch Rexroth | 4WEH16HC7XOF6EG24N9S2K4
4WEH16HC7X/OF6EG24N9S2K4
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The 4WEH16HC7X/OF6EG24N9S2K4 belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for use in hydraulic automation circuits where electrical actuation of oil flow is required. Valve size NG16 defines the mounting pattern and flow gallery dimensions, while two spool positions provide basic on-off or directional changeover functions. A rated operating pressure of 350 bar at ports P, A, and B allows the valve to control cylinders or motors in high-pressure systems, and a maximum flow capacity of 300 l/min maintains low pressure drop at elevated throughput. The solenoid is powered from a 24 V DC supply, and a DIN EN 175301-803 K4 connector offers a sealed, pluggable interface for field wiring. A concealed manual override identified by code N9 permits local shifting without energizing the coil, and the S2 discharge control feature lets technicians adjust switching time to match machine dynamics. Oil entering the valve must meet cleanliness class ISO 4406 (c) 20/18/15 to minimize wear on precision surfaces.
Pilot operation is handled by a type 6E pilot control valve that receives its supply oil from an external line, preventing main-line pressure fluctuations from affecting the pilot stage. Return flow from the pilot section is also routed externally, eliminating back pressure that could slow spool movement. Reliable actuation begins at a minimum pilot pressure of 14 bar, while a ceiling of 250 bar safeguards the pilot components against over-load. The main tank line connected to port T is limited to 250 bar to protect hoses and reservoir hardware, and the separate drain port Y tolerates up to 210 bar when mounted in circuits with elevated back pressure. Together these limits, along with the externally supplied pilot oil, ensure consistent response and prevent pressure-related damage during continuous service.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connector
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
350 bar
Max Pressure (port T)
250 bar
Max Pressure (port Y External)
210 bar
Maximum Flow
300 l/min
Pilot Control Valve Type
6E
Pilot Oil Return
External
Pilot Oil Supply
External
Pilot Pressure (max)
250 bar
Pilot Pressure (min)
14 bar
Spool Positions
2
Supply Voltage
24 V DC
Switching Time Adjustment
Discharge Control (S2)
Valve Size
NG16
1620 Old Apex Road
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