Bosch Rexroth | H-4WEH25G6X6EW110N9S2K4P45
H-4WEH25G6X/6EW110N9S2K4/P4.5
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The H-4WEH25G6X/6EW110N9S2K4/P4.5 directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. It directs hydraulic flow in automated power units and cylinder circuits. The valve is built around nominal size NG25 to suit medium-frame manifolds, and it follows the ISO 4401-08-08-0-05 porting pattern for interchangeability with standardized subplates. Under symbol G operation the channel can pass up to 400 l/min, allowing high volume transmission without excessive pressure loss. The main ports p, a, and b tolerate operating pressures up to 350 bar, while return port T is limited to 250 bar to protect reservoir lines. Pilot lines connected to port Y withstand 160 bar, and the pilot stage itself accepts supply pressures up to 250 bar to shift the spool reliably. When a three-position spring-centered spool is used, the pilot stage needs at least 13 bar to overcome spring force and initiate movement.
External pilot oil supply designated by code X keeps control pressure independent from main line fluctuations, and the three-position version displaces 14.2 cm³ of pilot oil per cycle. Switching time can be shortened through the S2 discharge adjustment, enabling precise timing in sequential machine functions. A preload valve opens at 4.5 bar to vent residual pilot pressure before the next command, preserving repeatable response. Electrical actuation is handled through a DIN EN 175301-803 connector coded K4, and emergency shifting is possible with a concealed manual override identified by N9. Installation is secured by six M12 × 60 screws that clamp the valve to the subplate without external brackets. Functional safety is reflected in a mean time to dangerous failure of 100 years for this WEH type, supporting long service intervals in continuous-duty hydraulic automation.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (symbol G)
400 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Port T Pressure
250 bar
Max Port Y Pressure (ac)
160 bar
Min Pilot Pressure (3-pos Spring)
13 bar
Mounting Screws
M12 x 60 (6 pcs)
Mttfd
100 years (type WEH)
Nominal Size
NG25
Pilot Oil Supply
External (X)
Pilot Volume (3-pos Spring)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Cracking Pressure
4.5 bar
Switching Time Adjustment
S2 (Discharge)
1620 Old Apex Road
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