Bosch Rexroth | 4WEH22W7X6EW110N9K4
4WEH22W7X/6EW110N9K4
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The 4WEH22W7X/6EW110N9K4 valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic oil in automated circuits that require precise pilot-operated switching. The NG25 size defines the port spacing and flow path dimensions suited to medium-large power units. A 4-way configuration provides two service ports and a return path, enabling bidirectional actuator control. The W spool profile establishes overlap characteristics that favor rapid shifting. The valve passes up to 450 l/min, allowing high flow systems to maintain speed. Channels p, a, and b withstand 280 bar, so the body tolerates elevated system pressures. The pilot stage accepts pressures up to 210 bar and functions down to 10.5 bar, which widens the usable control range. A zero-position orifice of 10 mm² limits leakage when the spool is centered.
A spring-centered return recenters the spool automatically when the solenoids are de-energized, and a pilot volume of 7.64 cm³ determines the fluid required for each shift. Installation follows the ISO 4401-08-08-0-05 subplate pattern, so the unit mates with standardized manifolds. Six M12 × 60 grade 10.9 screws secure the body, and each screw must be tightened to 100 Nm to maintain seal compression. Electrical power reaches the solenoids through a DIN EN 175301-803 K4 connector, simplifying field wiring. A concealed N9 manual override permits local actuation without exposing moving parts to contamination. The assembled unit with two solenoids and the spring mechanism weighs 11.9 kg, which influences mounting supports and handling during service.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (spool W)
450 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure
10.5 bar
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Screws
6 × M12 × 60 (10.9)
Pilot Volume (spring-centered)
7.64 cm³
Size
NG25
Spool Return
Spring-Centered
Spool Symbol
W
Tightening Torque (mounting Screws)
100 Nm
Way Configuration
4-Way
Weight (2 Solenoids, Spring-centered)
11.9 kg
Zero-pos. Orifice (w, A–t/b–t)
10 mm²
1620 Old Apex Road
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