Bosch Rexroth | 4WEH16D7X6EW110N9EK4B08
4WEH16D7X/6EW110N9EK4/B08
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The 4WEH16D7X/6EW110N9EK4/B08 directional valve is built by Bosch Rexroth for the WEH Directional Spool Valves series. It steers hydraulic flow in automated systems by shifting a two-position, four-way spool designated by symbol D so actuators receive or exhaust oil as commanded. Electro-hydraulic actuation allows a pilot stage to move the main spool, combining electrical control with hydraulic force for dependable switching under load. The NG16 size provides a passage area suited to medium flow circuits while keeping installation dimensions compact. A subplate mounting interface matched to ISO 4401-07-07-0-05 permits drop-in replacement on standard manifolds. The coil connects through a DIN EN 175301-803 K4 plug, enabling quick wiring in control cabinets. A concealed N9 manual override is present for local operation during commissioning or power loss. Maximum operating pressures reach 280 bar on pressure, A, and B ports, with port T limited to 250 bar so tank lines remain within safe limits.
The pilot circuit tolerates pressures up to 250 bar, allowing the control stage to share the main supply without auxiliary reducers. Reliable spring-ended return is achieved once pilot pressure falls below 14 bar, the minimum value specified for this configuration. Achieving the fastest shift requires a pilot flow of 35 l/min, ensuring the spool crosses its stroke without hesitation. An internal pilot volume of 11.45 cm³ must be filled during each changeover, a factor that influences response time. A throttle insert with a 0.8 mm orifice, coded B08, restricts pilot flow to damp sudden pressure rises and reduce hydraulic shock. Flow paths are opened or closed according to the commanded position, routing pressure and return lines to the connected actuator. These characteristics provide consistent timing and pressure control in machinery that depends on rapid, accurate direction changes.
Technical Specifications
Actuation
Electro-Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
280 bar
Max Operating Pressure (port T)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-pos Spring End)
14 bar
Mounting Interface
Subplate
Pilot Flow For Fastest Switching
35 l/min
Pilot Volume (2-position)
11.45 cm³
Porting Pattern
ISO 4401-07-07-0-05
Size
NG16
Spool Positions
2
Spool Symbol
D
Throttle Insert
Ø0.8 mm (B08)
Ways
4
1620 Old Apex Road
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