Bosch Rexroth | 4WEH16EA7X6EG125N9ETK4B10
4WEH16EA7X/6EG125N9ETK4/B10
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The 4WEH16EA7X/6EG125N9ETK4/B10 belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for controlling hydraulic actuators. It permits a maximum flow of 300 l/min for symbol E in NG16 size and resists operating pressures up to 280 bar at ports P, A, and B. The pilot stage tolerates 250 bar while the internal return path is limited to 210 bar. During three-position spring-centered service, the spool moves reliably with a minimum pilot pressure of 14 bar and a pilot volume of 5.72 cm³. Pilot oil supply and return are internal, and both pilot ports X and Y are closed, which removes the need for external lines. A concealed manual override identified as N9 enables local actuation when electrical signals are unavailable.
The valve mounts to subplates that follow the ISO 4401-07-07-0-05 porting pattern and connects electrically through a DIN EN 175301-803 plug. Acceptable hydraulic fluid cleanliness is ISO 4406 class 20/18/15 to maintain service life. A 1.0 mm throttle insert coded B10 can be installed to meter pilot flow. Secure installation requires M10 × 60 screws tightened to 58 Nm ±10 percent. The design achieves an MTTFd of 100 years, supporting functional safety goals in long-term machinery operation.
Technical Specifications
Electrical Connection
DIN EN 175301-803
Hydraulic Fluid Cleanliness
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol E, Ng16)
300 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y Internal)
210 bar
Min Pilot Pressure (3-pos Spring-centered)
14 bar
Mounting Screw Size
M10 x 60
Mounting Screw Torque
58 Nm ±10%
Mttfd
100 years
Pilot Oil Supply/return
Internal (ET)
Pilot Ports X And Y
Closed (ET)
Pilot Volume (3-pos Spring-centered)
5.72 cm3
Porting Pattern
ISO 4401-07-07-0-05
Throttle Insert
1.0 mm (B10)
1620 Old Apex Road
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