Bosch Rexroth | 4WEH16D7XOF6EW110N9ETK4
4WEH16D7X/OF6EW110N9ETK4
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The 4WEH16D7X/OF6EW110N9ETK4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and is used to route pressurized fluid in automated hydraulic circuits. Its size NG16 establishes the mounting envelope and flow cross-section suited to medium-frame manifolds. The D-coded spool forms two distinct flow patterns, and the two available spool positions allow switching between actuator ports in a simple extend-retract scheme. A maximum flow capability of 300 liters per minute lets the valve handle high throughput without excessive pressure drop. The main pressure rating of 280 bar on ports P, A, and B supports heavy-duty work functions, while the 250 bar limit on the tank port protects return lines. Installation is simplified because the body follows the ISO 4401-07-07-0-05 porting pattern, allowing direct mounting on standardized subplates. Reliable service requires oil cleanliness no worse than ISO 4406 class 20/18/15 to prevent wear on the metering edges.
Actuation is provided by a high-power 6E pilot valve that develops strong magnetic force for consistent shifting under load. An internal supply and internal return arrangement, denoted ET, feeds the pilot stage from the main inlet and drains it to tank without external hoses. Pilot flow of 35 liters per minute supports fast switching, and each shift consumes 11.45 cubic centimeters of oil so system designers can size accumulators accurately. Control pressure may reach up to 250 bar and must remain above 14 bar for the two-position spool to move reliably. Electrical connection is made through a DIN EN 175301-803 K4 plug, giving a sealed interface for the solenoid coil. A concealed manual override, coded N9, lets maintenance personnel move the spool mechanically during commissioning or power loss without compromising enclosure integrity.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (ng16, Symbol D)
300 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Operating Pressure (t)
250 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool)
14 bar
Pilot Flow For Fast Switching
35 l/min
Pilot Oil Arrangement
Internal Supply/Internal Return (ET)
Pilot Valve Type
High-Power (6E)
Pilot Volume Per Switch (2-spool)
11.45 cm3
Porting Pattern
ISO 4401-07-07-0-05
Spool Positions
2
Spool Symbol
D
Valve Size
NG16
1620 Old Apex Road
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