Bosch Rexroth | 4WEH16C7X6EW110N9S2K4
4WEH16C7X/6EW110N9S2K4
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The 4WEH16C7X/6EW110N9S2K4 valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and directs hydraulic oil to control cylinders and motors in automated systems. It uses a pilot-operated directional spool design so a small pilot stage shifts the main spool under load. Nominal size NG16 defines the interface dimensions and sets the valve’s flow range for mid-frame circuits. The spool marked with symbol C establishes the intended flow paths between pressure, actuator, and tank ports. Springs return the main spool to its neutral position when the pilot pressure is removed, ensuring fail-safe centering. A high-power 6E pilot stage generates the force needed to move the spool quickly under high system pressure. The pilot circuit can withstand up to 250 bar, allowing use in high-pressure installations, while reliable shifting starts at 14 bar when the spool is spring-centered at both ends. Delivering 35 l/min of pilot oil achieves the shortest switching time by supplying the pilot chamber rapidly.
External pilot oil supply isolates the pilot circuit from the main ports, and an external pilot oil return prevents back-pressure from slowing spool movement. The valve follows porting pattern ISO 4401-07-07-0-05, making it interchangeable with other NG16 subplates having the same pattern. Electrical actuation is connected through a DIN EN 175301-803 K4 plug, providing a standardized interface for coil wiring. Subplate mounting simplifies installation and removal without disturbing hard plumbing. Four M10 × 60 screws according to ISO 4762 secure the housing to the subplate, and each screw is tightened to 58 Nm within a ±10 % range to maintain seal compression without overstressing the threads. The design delivers a mean time to dangerous failure of 100 years, supporting long service intervals in industrial environments.
Technical Specifications
Control Spool Return (main Valve)
Springs
Electrical Connection
DIN EN 175301-803 (K4)
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure (2-spool Spring End)
14 bar
Mounting
Subplate
Mounting Screws
4x M10 x 60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size
NG16
Pilot Control Valve
High-Power (6E)
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Return Type
External
Pilot Oil Supply Type
External
Porting Pattern
ISO 4401-07-07-0-05
Spool Symbol
C
Tightening Torque (m10)
58 Nm ±10%
Valve Type
Directional Spool, Pilot-Operated
1620 Old Apex Road
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