Bosch Rexroth | 4WEH16E7X6EG24N9K4B10
4WEH16E7X/6EG24N9K4/B10
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The 4WEH16E7X/6EG24N9K4/B10 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow to actuators in automated machinery where rapid, high-pressure switching is necessary. The valve is built in size NG16, a dimension that matches manifolds handling medium-flow circuits. It fits to an ISO 4401-07-07-0-05 subplate, allowing drop-in replacement in standardized hydraulic blocks. Working ports P, A, and B withstand up to 280 bar so the unit can be placed in main pressure lines without an external relief. When symbol E is selected, the spool passes as much as 300 liters per minute, giving ample capacity for large cylinders. A 24 V DC pilot solenoid energizes the control stage, and a pilot flow of 35 l/min is required to obtain the shortest switching time. Spring-centered operation starts at a minimum pilot pressure of 14 bar, while the pilot circuit may be fed up to 250 bar for consistent response under variable system loads.
Fluid limits and interface features define the remaining operating envelope. The nitrile-sealed version accepts oil temperatures from ‑20 °C to +80 °C, so it covers cold-start and elevated-load conditions without viscosity-driven malfunction. Return oil in port T can be subjected to 250 bar, and drain port Y on a directional-control manifold with downstream check maintains integrity up to 210 bar, enabling back-pressure installation in restricted circuits. A throttle insert with a 1.0 mm orifice can be fitted to tailor pilot damping when oscillation must be suppressed. System cleanliness must meet ISO 4406 class 20/18/15 to protect the precision spool lands from abrasive wear. Electrical connection is made through a DIN EN 175301-803 plug that supports quick field replacement of the coil. The design achieves a mean time to dangerous failure of 100 years, providing long service life in safety-related hydraulic controls while reducing scheduled replacement intervals.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connector
DIN EN 175301-803
Max Flow (symbol E, Ng16)
300 l/min
Max Fluid Temperature (nbr)
+80 °C
Max Operating Pressure (p/a/b)
280 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (dc)
210 bar
Min Fluid Temperature (nbr)
-20 °C
Min Pilot Pressure (spring-centered)
14 bar
Mounting Pattern
ISO 4401-07-07-0-05
Mttfd
100 years
Pilot Flow For Shortest Switching
35 l/min
Pilot Solenoid Voltage
24 V DC
Throttle Insert Diameter
1.0 mm
Valve Size
NG16
1620 Old Apex Road
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