Bosch Rexroth | 4WEH16HC7X6EW110N9DAL
4WEH16HC7X/6EW110N9DAL
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The 4WEH16HC7X/6EW110N9DAL directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for hydraulic automation where rapid and precise flow redirection is required. The valve uses electro-hydraulic actuation, so an electromagnetically driven pilot stage moves the main spool. Its NG16 frame accommodates medium-flow lines without oversized manifolds. The mounting interface follows porting pattern ISO 4401-07-07-0-05 for interchangeability with standard subplates. A maximum flow capacity of 300 l/min maintains adequate velocity in high-demand circuits. Ports P, A, and B withstand operating pressures up to 350 bar. The spool offers two hydraulic end positions that switch flow paths in discrete steps. A 6E pilot valve generates the control pressure required to shift the main stage.
The external pilot circuit may reach 250 bar, while reliable shifting starts at 14 bar. Pilot oil enters through port X and returns to tank via port Y to isolate the control stage from main-line pressure fluctuations. When configured with two positions, the pilot chamber volume is 11.45 cm³, influencing response speed. A concealed N9 manual override allows local actuation during setup or fault conditions. Installation requires tightening M10 mounting screws to 58 N·m. Hydraulic fluid cleanliness must meet ISO 4406 class 20/18/15 to avoid wear on the sliding spool. The calculated mean time to dangerous failure is 100 years, giving a long nominal service life. These limits allow integration into power units that operate continuously under high load.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow
300 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
14 bar
Mount Screw Torque (m10)
58 Nm
Mttfd
100 years
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Type
6E
Pilot Volume (2-spool)
11.45 cm3
Porting Pattern
ISO 4401-07-07-0-05
Spool Positions
2 (Hydraulic End)
Valve Size
NG16
1620 Old Apex Road
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