Bosch Rexroth | H-4WEH16HG7X6EG24N9S2K4
H-4WEH16HG7X/6EG24N9S2K4
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The H-4WEH16HG7X/6EG24N9S2K4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs oil flow in hydraulic automation loops by shifting a four-way spool between defined positions. The NG16 nominal size sets the flow cross-section and matches subplates with the ISO 4401-07-07-0-05 porting pattern. Electrical actuation uses a 24 V DC solenoid that connects through a DIN EN 175301-803 K4 plug, facilitating quick wiring in control enclosures. A concealed N9 manual override permits on-site shifting when electrical power is unavailable. In the pressure-centered zero position the spool blocks pump flow, preventing unintended movement until a signal is received. Working ports p, a, and b tolerate operating pressures up to 350 bar, allowing integration into high-pressure machinery.
Under flow duties the valve passes up to 300 l/min while the spool is pressure-centered, giving headroom for mid-size hydraulic cylinders. Fast switching is aided by a pilot flow of 35 l/min and a pilot volume of 2.83 cm³, which shorten response times in cyclic motion tasks. The pilot stage accepts pressures to 250 bar and can return oil through line y at up to 210 bar; reliable operation begins at a minimum pilot pressure of 16 bar. These limits protect the pilot solenoid and upstream control lines. Correct fastening to the manifold requires tightening the mounting screws to 58 Nm, and the assembled unit weighs 8.9 kg, so standard handling gear is sufficient during service.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (pressure-centered)
300 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y, Dc)
210 bar
Min Pilot Pressure (pressure-centered)
16 bar
Mounting Screw Torque
58 Nm
Nominal Size
NG16
Pilot Flow For Fast Switching
35 l/min
Pilot Volume (0→a)
2.83 cm3
Porting Pattern
ISO 4401-07-07-0-05
Solenoid Voltage
24 V DC
Way Version
4-Way
Weight (2-sol, Pressure-centered)
8.9 kg
Zero Position
Pressure-Centered
1620 Old Apex Road
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