Bosch Rexroth | 4WEH16H7X6EW110N9K4
4WEH16H7X/6EW110N9K4
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The 4WEH16H7X/6EW110N9K4 directional spool valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs and switches hydraulic flow in industrial automation systems where electronic control over pilot oil is required. This model is built in size 16 and mounts on a subplate that follows the ISO 4401-07-07-0-05 porting pattern for straightforward integration with manifold blocks. Electrical actuation is made through a DIN EN 175301-803 K4 connector, while a concealed manual override identified by the N9 code provides local positioning during service. Pilot oil is supplied externally via port X and returned through port Y so internal passages remain free for main flow. The main ports P, A, and B can withstand up to 350 bar, and the tank port T is limited to 250 bar, enabling reliable operation in high-pressure circuits.
The valve operates in ambient temperatures from −20 °C to +50 °C and accepts hydraulic fluid temperatures between −20 °C and +80 °C, allowing year-round service in standard plant environments. It handles viscosities from 2.8 to 500 mm2/s, so both low and high viscosity media can be used without loss of switching accuracy. Approved fluids include mineral-based HL, HLP, and HVLP oils as well as biodegradable HETG, HEES, and HEPG types; fire-resistant HFDU, HFDR, and HFC fluids are also compatible. The pilot stage tolerates pressures up to 250 bar, while a minimum of 14 bar is required on two-spool hydraulic ends to achieve reliable shifting. Cleanliness must meet ISO 4406 code 20/18/15 to prevent spool sticking and wear. These parameters ensure consistent performance within the specified limits of the WEH valve design.
Technical Specifications
Ambient Temperature Range (nbr)
-20 to +50 °C
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp Range (nbr)
-20 to +80 °C
Hydraulic Fluids
HL/HLP/HVLP; HETG/HEES/HEPG; HFDU/HFDR/HFC
Manual Override
Concealed (N9)
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (t)
250 bar
Min Pilot Pressure (2-spool Hydraulic End)
14 bar
Mounting Type
Subplate
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-07-07-0-05
Size (ng)
16
Viscosity Range
2.8 to 500 mm2/s
1620 Old Apex Road
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