Bosch Rexroth | 4WEH16E7X6EW110N9ETDK25LB08
4WEH16E7X/6EW110N9ETDK25L/B08
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The 4WEH16E7X/6EW110N9ETDK25L/B08 directional valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks. It is supplied in size NG16, which sets the interface dimensions and establishes the flow envelope for medium-frame circuits. The spool designated by symbol E creates the required flow paths for actuator control, and a spring returns the spool to center when pilot pressure is removed. A maximum flow capacity of 300 l/min allows the device to handle large volumes without excessive pressure loss. Internal pilot oil supply channels eliminate external feed lines, while an internal return path directs pilot oil back to tank through the body. A pilot flow of 35 l/min is available when the shortest switching time is needed. Installation follows the ISO 4401-07-07-0-05 porting pattern so the valve mounts directly to standard subplates.
Fluid entering the 4WEH16E7X/6EW110N9ETDK25L/B08 must meet ISO 4406 class 20/18/15 to protect the precision spool. A concealed manual override allows emergency operation without exposing internal parts. Working ports A and B withstand operating pressures up to 280 bar, and the pilot stage is rated for 250 bar. For the three-position, spring-centered version, at least 14 bar of pilot pressure is required to shift the spool. Each cycle moves 5.72 cm³ of pilot oil, a volume that influences response time in low-flow pilot systems. A 0.8 mm throttle insert can be fitted to adjust damping inside the pilot passages. Mounting screws must be tightened to 58 Nm to maintain seal integrity under load. These combined ratings support reliable, repeatable directional control in automated hydraulic machinery.
Technical Specifications
Control Spool Return
Spring
Fluid Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed
Max Flow (symbol E, Ng16)
300 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos Spring-centered)
14 bar
Mounting Screw Torque
58 Nm
Pilot Flow (shortest Switching Time)
35 l/min
Pilot Oil Return
Internal
Pilot Oil Supply
Internal
Pilot Volume (3-pos Spring-centered)
5.72 cm3
Porting Pattern
ISO 4401-07-07-0-05
Size
NG16
Spool Symbol
E
Throttle Insert Diameter
0.8 mm
1620 Old Apex Road
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