Bosch Rexroth | 4WEH10Q4X6EG125N9ETK4B10
4WEH10Q4X/6EG125N9ETK4/B10
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The 4WEH10Q4X/6EG125N9ETK4/B10 valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated circuits. It is actuated electro-hydraulically, using an electrical signal to pilot the main spool for rapid switching. The nominal size NG10 defines the port diameters and mounting face, while the ISO 4401-05-05-0-05 porting pattern aligns the valve with standardized subplates. Component series 4X identifies the internal design stage that matches current spare-part sets. Spool symbol Q determines the connection paths between ports during each position. The valve withstands 280 bar on ports p, a, and b, supporting systems that operate at high pressure, and it carries up to 160 l/min through the Q spool to maintain flow capacity. Pilot pressure may reach 250 bar, allowing the control stage to function within common supply ranges.
Internal pilot supply and return (ET) route control oil inside the housing, removing the need for external pilot lines. Reliable shifting begins at a minimum pilot pressure of 12 bar, and pilot drain pressures may rise to 210 bar without impairing operation. Electrical connection is provided by a DIN EN 175301-803 plug coded K4, giving a compact coil interface for machine wiring. A concealed manual override labeled N9 enables local actuation during commissioning or power loss. The Ø 1.0 mm throttle insert B10 limits pilot flow so spool movement remains stable. Fluid cleanliness must meet ISO 4406 class 20/18/15 to protect clearances and seals. A mean time to dangerous failure of 100 years supports safety calculations in long-life installations.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 (20/18/15)
Component Series
4X
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (symbol Q)
160 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y Internal)
210 bar
Min Pilot Pressure
12 bar
Mttfd
100 years
Nominal Size
NG10
Pilot Supply/return
Internal/Internal (ET)
Porting Pattern
ISO 4401-05-05-0-05
Spool Symbol
Q
Throttle Insert
Ø 1.0 mm (B10)
1620 Old Apex Road
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