Bosch Rexroth | 4WEH10J4X6EW110N9ETK4B08
4WEH10J4X/6EW110N9ETK4/B08
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The 4WEH10J4X/6EW110N9ETK4/B08 directional valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is used to route pressure, tank, and actuator lines in hydraulic automation systems. It is assembled in valve size NG10, matching mounting interfaces that handle medium flow rates, and follows the ISO 4401-05-05-0-05 porting pattern so it can bolt directly to standardized subplates. A three-position spring-centered spool returns to neutral when solenoids are de-energized, enabling fail-safe load holding between control commands. The J-symbol flow path permits up to 160 l/min, allowing the unit to serve cylinders or motors with moderate displacement. Working ports P, A, and B tolerate 280 bar while the T port shares the same 280 bar limit, supporting circuits where back-pressure may occur. A concealed N9 manual override lets technicians shift the spool during commissioning without exposing moving parts, and the assembly weighs 6.8 kg, which simplifies single-person installation.
Internal pilot oil supply through the ET channel eliminates the need for an external feed line, and return flow is routed back to the tank through the internal T port, reducing manifold drilling. The pilot stage operates between 12 bar minimum and 250 bar maximum, assuring reliable actuation across typical system pressures. A throttle insert with a 0.8 mm bore, coded B08, damps pressure spikes by restricting pilot flow during rapid switching. Hydraulic media should exhibit a viscosity between 2.8 and 500 mm²/s to maintain stable film formation over the spool lands, and cleanliness must reach ISO 4406 20/18/15 to limit wear in the precision fit surfaces. Nitrile seals allow fluid temperatures from –20 °C to +80 °C, covering cold start and continuous duty conditions in industrial equipment. These parameters permit the valve to deliver consistent directional control without external pilot plumbing or elaborate filtration upgrades.
Technical Specifications
Fluid Cleanliness
ISO 4406 (c) 20/18/15
Hydraulic Fluid Temp Range
-20 to +80 °C (NBR)
Manual Override
Concealed (N9)
Max Flow (symbol J)
160 l/min
Max Pilot Pressure
250 bar
Max Pressure (p, A, B)
280 bar
Max Pressure (t Port)
280 bar
Min Pilot Pressure
12 bar
Pilot Oil Return
Internal (T Port)
Pilot Oil Supply
Internal (ET)
Porting Pattern
ISO 4401-05-05-0-05
Spool Positions
3 (Spring-Centered)
Throttle Insert
Ø 0.8 mm (B08)
Valve Size
NG10
Viscosity Range
2.8 to 500 mm²/s
Weight (two Solenoids)
6.8 kg
1620 Old Apex Road
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