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The 4WEH16U7X/6EG24N9ETK4/B10 valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and directs hydraulic flow in automated systems. It shifts a U-type spool that is spring-centered to its neutral position when the coil is not energized. The unit is built in nominal size NG16 to match manifolds drilled to that size, and it mounts on an ISO 4401-07-07-0-05 porting pattern. Actuation is provided by a 24 V DC solenoid that plugs into a DIN EN 175301-803 K4 connector, while a concealed N9 manual override allows local operation without power. Pilot oil is supplied internally through channel X and returned internally through channel Y, reducing the need for external pilot lines.
The working ports tolerate pressures up to 350 bar, and the pilot stage can accept 250 bar while needing at least 14 bar to function. A Ø 1.0 mm throttle insert identified as B10 restricts pilot flow to soften spool movement. Sealing is handled by NBR material suited to common hydraulic fluids, and all external surfaces carry a coating no thicker than 100 µm. System fluid must meet ISO 4406 cleanliness code 20/18/15 to prevent wear and sticking inside the valve. These pressure, flow-control, sealing, coating, and cleanliness parameters work together to ensure stable switching performance in hydraulic automation circuits.
Cleanliness Class
ISO 4406 20/18/15
Coating Thickness
Max 100 µm
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
14 bar
Nominal Size
NG16
Pilot Oil Return
Internal (Y)
Pilot Oil Supply
Internal (X)
Porting Pattern
ISO 4401-07-07-0-05
Seal Material
NBR
Solenoid Voltage
24 V DC
Spool Centering
Spring-Centered
Spool Symbol
U
Throttle Insert
Ø 1.0 mm (B10)
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