Bosch Rexroth | 4WEH16HD7X6EW110N9K4
4WEH16HD7X/6EW110N9K4
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The 4WEH16HD7X/6EW110N9K4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. Designed for hydraulic automation circuits, it directs pressurized fluid between actuators and pumps using electro-hydraulic actuation. With a nominal size of NG16, the flow passages match medium frame manifold interfaces. The 4-way path arrangement allows independent control of two cylinder ports, and the internal D-type spool establishes two distinct switching positions for straightforward extend or retract functions. Rated for a maximum flow of 300 l/min, the valve suits high-volume systems while keeping pressure losses moderate. Ports P, A, and B can be subjected to up to 350 bar, supporting heavy-duty motion tasks. Connection to sub-plates follows the ISO 4401-07-07-0-05 pattern so it can be installed on standard manifolds without adapter blocks.
Pilot oil control needs at least 14 bar and may reach 250 bar, so upstream logic valves must deliver within this range. Port T tolerates back-pressures up to 250 bar, which simplifies tank line routing in compact machines. Achieving the shortest switching time requires a pilot flow of 35 l/min, ensuring rapid spool movement when cycle times are critical. After actuation, the spool is driven to its hydraulic end position without mechanical springs, improving repeatability under fluctuating temperatures. Mounting uses four M10 × 60 screws, each tightened to 58 Nm, providing secure clamping to the manifold face. System cleanliness must be maintained at ISO 4406 (c) 20/18/15 to protect the precision lands and extend service life.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Flow
300 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure
14 bar
Mounting Screw Size
M10 x 60
Mounting Screw Torque
58 Nm
Nominal Size
NG16
Pilot Flow For Shortest Switching Time
35 l/min
Porting Pattern
ISO 4401-07-07-0-05
Spool Return
Hydraulic End Position
Spool Type
D
Switching Positions
2
Way Configuration
4-Way
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