Bosch Rexroth | 4WEH16D7X6EG12N9ETK4B10SO388
4WEH16D7X/6EG12N9ETK4/B10SO388
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The 4WEH16D7X/6EG12N9ETK4/B10SO388 valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth. It directs hydraulic flow in automated machinery using a 4-way arrangement that connects pressure, tank, and two actuator lines. The nominal size is 16, which defines flow capacity for medium to high volume circuits. Two spool positions create extend and retract states for cylinders. A DIN EN 175301-803 electrical connector provides standardized solenoid wiring. The manual override is concealed so accidental actuation is avoided while permitting local shifting during service. Mounting follows the ISO 4401-07-07-0-05 porting pattern, enabling interchange with common subplates. Pilot oil is supplied internally, removing the need for an external pilot line, and it also returns internally to simplify plumbing. Shifting the two-position spool requires a pilot volume of 11.45 cm³, allowing designers to size pilot flow controls accurately.
The hydraulic limits match demanding automation tasks. Ports p, a, and b withstand operating pressures up to 280 bar, while the pilot stage accepts up to 250 bar to secure reliable actuation under full system load. The tank port tolerates 210 bar when the valve uses direct current coils and an internal Y drain. A minimum pilot pressure of 14 bar is necessary to move the two-position spool, establishing the lower control threshold. A 1.0 mm throttle insert can be fitted to meter pilot flow and damp shifting transients. NBR seals are used to resist common mineral oil fluids and hold pressure at elevated temperatures. The calculated mean time to dangerous failure is 100 years, supporting functional safety targets and long maintenance intervals.
Technical Specifications
Electrical Connection
DIN EN 175301-803
Manual Override
Concealed
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
250 bar
Max Tank Port Pressure (t)
210 bar (DC, Y Internal)
Min Pilot Pressure (2-spool)
14 bar
Mttfd
100 years
Pilot Oil Return
Internal
Pilot Oil Supply
Internal
Pilot Volume (2-spool)
11.45 cm3
Porting Pattern
ISO 4401-07-07-0-05
Seal Material
NBR
Size (ng)
16
Spool Positions
2
Throttle Insert Diameter
1.0 mm
Ways
4
1620 Old Apex Road
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