Bosch Rexroth | H-4WEH16D7X6EG24N9ETK4B10D3-SO388
H-4WEH16D7X/6EG24N9ETK4/B10D3 SO388
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The H-4WEH16D7X/6EG24N9ETK4/B10D3 SO388 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for routing hydraulic flow in automated machinery. Its nominal size is NG16, establishing the interface dimensions and allowable flow rate. A 4-way configuration provides pressure, tank, and two work ports, and the spool offers 2 discrete positions for switching between circuits. The port layout follows ISO 4401-07-07-0-05, enabling direct mounting on standard sub-plates. Pilot oil is taken internally from the P channel and returned internally to the T channel, which removes the need for external pilot plumbing. Actuation is driven by a 24 V DC coil, and electrical power reaches the coil through a connector that meets DIN EN 175301-803 form K4.
The main flow paths withstand 350 bar while the pilot stage accepts up to 250 bar and needs at least 14 bar to shift the spool. A pressure-reducing element fixed at 45 bar limits pilot pressure for consistent response. A 1.0 mm throttle orifice labeled B10 meters pilot oil to dampen rapid transients. A concealed manual override identified as N9 lets maintenance staff move the spool without energizing the coil. Installation requires four M10 × 60 screws, and each screw must be tightened to 58 Nm to seal the valve body to the manifold.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-pos.)
14 bar
Mounting Screws
M10 x 60 (4 pcs)
Nominal Size
NG16
Pilot Oil Return
Internal (T)
Pilot Oil Supply
Internal (P)
Porting Pattern
ISO 4401-07-07-0-05
Pressure Reducing Valve Setting
45 bar
Rated Voltage
24 V DC
Spool Positions
2
Throttle Orifice
1.0 mm (B10)
Tightening Torque (m10)
58 Nm
Way Configuration
4-Way
1620 Old Apex Road
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