Bosch Rexroth | 4WEH16D7X6EG96N9ETK4B08
4WEH16D7X/6EG96N9ETK4/B08
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The 4WEH16D7X/6EG96N9ETK4/B08 valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and serves as a 4-way control element in hydraulic automation circuits. It is built in nominal size NG16 so it fits manifolds designed for medium flow rates. The spool version identified by symbol D provides standard crossover paths for bidirectional cylinder control. A maximum flow capacity of 300 l/min enables the valve to handle high-volume circuits without excessive pressure loss. The unit tolerates a maximum operating pressure of 280 bar on ports P, A, and B which suits industrial power units. Internal pilot oil supply marked ET feeds the pilot stage from the pressure port eliminating separate pilot lines. Internal pilot oil return routed to port T directs pilot drainage back to the tank side inside the same manifold. The design requires a minimum pilot pressure of 14 bar to ensure reliable spool shifting. An ISO 4401-07-07-0-05 mounting interface allows direct mounting on standard subplates.
Pilot circuits may reach up to 250 bar, which is the maximum pilot pressure for this model. The T-port can also withstand 250 bar. This capacity prevents back pressure in return lines from compromising operation. A throttle with a diameter of 0.8 mm in the pilot stage limits flow to stabilize actuation speed. Spool return springs drive the main spool back to the neutral position when pilot pressure is removed. A concealed manual override coded N9 lets maintenance staff shift the spool mechanically during commissioning or power loss. Electrical actuation is made through a DIN EN 175301-803 connector coded K4, giving a familiar plug interface for coils. The valve must be installed with hydraulic fluid filtered to ISO 4406 cleanliness class 20/18/15 to protect precision surfaces.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Main Spool Return
Spring
Manual Override
Concealed (N9)
Max Flow (symbol D, Ng16)
300 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
250 bar
Max T-port Pressure
250 bar
Min Pilot Pressure
14 bar
Mounting Interface
ISO 4401-07-07-0-05
Nominal Size
NG16
Pilot Oil Return
Internal (T)
Pilot Oil Supply
Internal (ET)
Spool Symbol
D
Throttle Diameter
0.8 mm
Valve Function
4-Way
1620 Old Apex Road
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