Bosch Rexroth | 4WEH16H7X6EW110N9DA
4WEH16H7X/6EW110N9DA
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The 4WEH16H7X/6EW110N9DA valve is built by Bosch Rexroth within the WEH Directional Spool Valves series for directional control in hydraulic automation. It fits the NG16 nominal size, establishing envelope and port spacing for subplate layouts. A porting pattern of ISO 4401-07-07-0-05 matches standard manifold blocks for straightforward interchange. The unit draws pilot oil from an external X port so control pressure can be regulated apart from main line pressure, while an external Y port returns that pilot flow directly to tank. Spool re-centering is hydraulic, using system pressure rather than springs. A concealed manual override lets service staff shift the spool locally when electrical signals are unavailable. Four M10 × 60 screws according to ISO 4762 fasten the housing to its mounting face. Hydraulic fluid cleanliness must reach ISO 4406 20/18/15 to maintain spool land accuracy and reduce wear.
Main pressure ratings permit 350 bar on ports P, A, and B, enabling the valve to handle high-pressure circuits, while the T port is limited to 250 bar to protect return plumbing. A maximum flow of 300 l/min supports actuators that demand rapid movement. The pilot stage tolerates up to 250 bar so it can follow the primary system pressure without damage, yet it needs at least 14 bar to drive the spool fully to an end position. Acceptable fluid viscosity spans 2.8 to 500 mm²/s, covering light oils at high temperature through heavy grades in cold starts. Installed weight is 8.5 kg, a factor when selecting brackets or service tools during maintenance.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed
Max Operating Pressure (p, A, B)
350 bar
Max Operating Pressure (t)
250 bar
Maximum Flow
300 l/min
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure (hydraulic End Pos.)
14 bar
Mounting Screws
4 x M10 x 60 (ISO 4762)
Nominal Size
NG16
Pilot Return
External (Y)
Pilot Supply
External (X)
Porting Pattern
ISO 4401-07-07-0-05
Spool Return
Hydraulic
Viscosity Range
2.8 to 500 mm2/s
Weight
8.5 kg
1620 Old Apex Road
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