Bosch Rexroth | 4WEH16C7X6EW110NSK4
4WEH16C7X/6EW110NSK4
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The 4WEH16C7X/6EW110NSK4 directional spool valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series and routes hydraulic flow to actuators in automated machinery. It is supplied in nominal size NG16, and the porting pattern ISO 4401-07-07-0-05 allows direct installation on standardized manifolds. Subplate mounting lets technicians replace the unit without disturbing hard plumbing, while four M10 × 60 screws hold it in place and must be tightened to 58 Nm. The valve carries up to 300 l/min, giving sufficient capacity for medium-to-high flow circuits, and ports P, A, and B tolerate 280 bar to transmit force safely. A cleanliness level of 20/18/15 under ISO 4406 is required so internal clearances remain free of abrasive contamination.
An internal pilot oil supply designated as type E draws control pressure from the inlet gallery, and the pilot oil is returned externally through port Y to prevent control pressure buildup. The spool shifts only when internal channel X sees at least 4.5 bar, while the pilot stage endures up to 250 bar without seal damage. Tank port T is also rated for 250 bar so backpressure in return lines will not compromise operation. The design achieves a mean time to dangerous failure of 100 years, which supports long-term use in safety-related hydraulic systems.
Technical Specifications
Fluid Cleanliness Class
20/18/15 (ISO 4406)
Max Operating Pressure (ports P, A, B)
280 bar
Max Pilot Pressure
250 bar
Maximum Flow
300 l/min
Minimum Pilot Pressure (internal X)
4.5 bar
Mounting Screw Torque
58 Nm
Mounting Screws
4 × M10 × 60
Mounting Type
Subplate
Mttfd
100 years
Nominal Size
NG16
Pilot Oil Return
External (Port Y)
Pilot Oil Supply
Internal (Type E)
Porting Pattern
ISO 4401-07-07-0-05
Tank Port T Max Pressure
250 bar
1620 Old Apex Road
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