Bosch Rexroth | H-4WEH25R6X6EW110N9EK4B10D3
H-4WEH25R6X/6EW110N9EK4/B10D3
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The H-4WEH25R6X/6EW110N9EK4/B10D3 directional spool valve is built by Bosch Rexroth as part of the WEH Directional Spool Valves series. It directs pressure oil to actuators in hydraulic automation circuits. The valve is supplied in nominal size NG25, so it fits manifolds designed for 1-inch flow paths. A porting pattern of ISO 4401-08-08-0-05 matches standardized subplates for quick installation. Three spool positions combined with an R spool geometry allow mid-stroke flow paths suited to rapid cylinder reversal. The control spool is spring-centered, so flow returns to the neutral state when solenoids are de-energized. Internal pilot supply (E) eliminates the need for an external pilot line, while an external pilot return (Y) routes exhaust oil back to tank without pressurizing the pilot chamber. A B10 throttle insert is included in the pilot valve to meter pilot flow during shifting. With two solenoids and the centering spring assembly the unit weighs 19.0 kg, which influences mounting hardware selection.
Operating limits support high-power motion tasks. The pressure galleries p, a, and b withstand 350 bar, enabling use in heavy industrial presses. Pilot operation tolerates up to 250 bar, and the pilot return port y can carry 160 bar when driven by an AC coil, preventing back-pressure-induced malfunction. Required pilot pressure for reliable actuation in the spring-centered three-position version starts at 13 bar, and each shift consumes 14.2 cm³ of pilot oil. At 350 bar the R spool passes up to 580 l/min, providing adequate flow for large bore cylinders. A D3 secondary pressure rating of 45 bar limits auxiliary circuits connected to the drain port. These parameters together define safe margins and performance envelopes for automated machinery controlled by the valve.
Technical Specifications
Control Spool Return
Spring-Centered
D3 Secondary Pressure
45 bar
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y)
160 bar (AC coil)
Maximum Flow (symbol R, 350 Bar)
580 l/min
Min Pilot Pressure (3-pos Spring)
13 bar
Nominal Size
NG25 (W.H 25)
Pilot Return
External (Y)
Pilot Supply
Internal (E)
Pilot Volume (3-pos Spring)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Spool Positions
3
Spool Symbol
R
Throttle Insert
B10 (pilot valve)
Weight (2 Solenoids, Spring-centered)
19.0 kg
1620 Old Apex Road
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