Bosch Rexroth | 4WEH16HD7XOF6EG24N9TDK25L
4WEH16HD7X/OF6EG24N9TDK25L
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The 4WEH16HD7X/OF6EG24N9TDK25L valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. It directs hydraulic flow between actuators and supply lines in automated systems that require discrete switching. The 4-way function provides separate P, T, A, and B ports so cylinders or motors can extend and retract under controlled pressure. Electro-hydraulic actuation converts a 24 V DC coil signal into pilot pressure, enabling remote electrical control of the main spool. Nominal size NG16 matches ISO cavities for mid-frame machinery and supports a performance limit flow of 300 l/min to suit high-throughput circuits. The spool marked HD defines the metering geometry, while a minimum pilot pressure of 14 bar is needed to shift the main stage reliably. Mounting follows the ISO 4401-07-07-0-05 pattern which standardizes interface dimensions and simplifies manifold design.
The valve withstands system pressures up to 350 bar on ports P, A, and B, while the tank port is rated for 250 bar, matching common industrial power units. Pilot operation tolerates pressures up to 250 bar without damage, and the pilot oil is taken from an external X connection so the control stage is independent of main line fluctuations. After actuation, pilot oil returns internally through port T, and the main spool is pushed back by hydraulic return forces when the solenoid is de-energized. A concealed N9 manual override permits local shifting during commissioning without exposing moving parts. Fluid cleanliness must meet ISO 4406 class 20/18/15 to prevent wear in the tight spool clearances. These features combine to deliver reliable switching under rigorous duty cycles in mobile or stationary hydraulic automation.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Coil Voltage
24 V DC
Control Spool Return
Hydraulic
Manual Override
Concealed Type (N9)
Max Pilot Pressure
250 bar
Max Pressure (p, A, B)
350 bar
Max Pressure (t)
250 bar
Min Pilot Pressure
14 bar
Nominal Size
NG16
Performance Limit Flow
300 l/min
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-07-07-0-05
Spool Symbol
HD
Valve Function
4-Way
1620 Old Apex Road
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