Bosch Rexroth | 4WEH16HC7X6EG24N9K4
4WEH16HC7X/6EG24N9K4
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The 4WEH16HC7X/6EG24N9K4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs flow in hydraulic automation circuits where remote electrical actuation is required. The NG16 size supports modular mounting while keeping pressure losses moderate. Two spool positions allow the machine controller to switch between separate flow paths on demand. A porting pattern that follows ISO 4401-07-07-0-05 aligns the valve with common subplates for quick installation. The rated flow capacity of 300 l/min accommodates medium to high throughput systems without cavitation. Circuit pressure up to 350 bar on ports P, A, and B lets the unit serve high-pressure cylinders. A 24 V DC coil energizes the pilot stage so it can be driven directly from standard machine I/O, and the DIN EN 175301-803 connector streamlines wiring. Acceptable oil viscosity from 2.8 to 500 mm²/s keeps response consistent across seasonal fluid changes.
An ambient temperature window of -20 to +50 °C permits outdoor installation in moderate climates, while an oil temperature range of -20 to +80 °C prevents seal degradation in hot return lines. Cleanliness class ISO 4406 20/18/15 limits particulate load to protect the precision spool fit. The 250 bar pressure rating on port T withstands external tank lines that see elevated back-pressure during braking cycles. External pilot oil supply separates control pressure from the main ports so signal quality is unaffected by load variations, and an external pilot oil return removes pilot exhaust without contaminating the tank line. A maximum pilot pressure of 250 bar and a minimum of 14 bar define the usable control range for remote pressure regulators. Together these parameters maintain reliable shifting and long service life.
Technical Specifications
Ambient Temp Range
-20 to +50 C
Cleanliness Class
ISO 4406 20/18/15
Coil Voltage
24 V DC
Electrical Connection
DIN EN 175301-803
Fluid Temp Range
-20 to +80 C
Max Flow
300 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
14 bar
Pilot Oil Return
External
Pilot Oil Supply
External
Porting Pattern
ISO 4401-07-07-0-05
Size
NG16
Spool Positions
2
Viscosity Range
2.8 to 500 mm2/s
1620 Old Apex Road
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