Bosch Rexroth | H-4WEH25E6X6EW110N9DK25L
H-4WEH25E6X/6EW110N9DK25L
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The H-4WEH25E6X/6EW110N9DK25L directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and directs hydraulic oil in automated machinery. It is supplied in nominal size NG25, providing a passage area suited to power units that require high volume flow. The mounting surface follows the subplate arrangement in ISO 4401, allowing quick installation on standardized manifolds. Ports are arranged to the ISO 4401-08-08-0-05 pattern so line connections match common base plates. The valve tolerates operating pressures up to 350 bar, enabling use in high-pressure circuits. At that pressure it supports a maximum flow of 650 l/min, which satisfies fast actuator cycles. Acceptable fluid viscosities extend from 2.8 to 500 mm²/s, covering the range of most mineral hydraulic oils. System oil must meet cleanliness class ISO 4406 20/18/15 to limit spool wear. Ambient temperatures may vary from −20 to 50 °C, and hydraulic fluid temperatures may range from −20 to 80 °C without affecting function.
Several pilot control details influence how the valve integrates with electro-hydraulic automation loops. A concealed manual override identified as N9 lets maintenance personnel shift the spool when electrical power is unavailable. Fastest switching is achieved when 35 l/min of pilot flow is provided, ensuring rapid movement of the main spool. The three-position spring-centered version requires a pilot volume of 14.2 cm³ for each stroke, which determines the sizing of control lines. Pilot supply can reach 250 bar, giving ample margin for remote mounting, while the spool begins to move at a minimum pilot pressure of 13 bar. Mounting screws must be tightened to 100 Nm when using M12 × 60 class 10.9 hardware to maintain sealing surfaces. The valve with two solenoids and return springs weighs 19.0 kg, information needed for handling, support brackets, and service planning.
Technical Specifications
Ambient Temperature (nbr)
-20 to +50 C
Bolt Tightening Torque
100 Nm (M12 x 60, 10.9)
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp (nbr)
-20 to +80 C
Manual Override
Concealed (N9)
Max Flow (e, 350 Bar)
650 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
13 bar (3-Pos Spring)
Mounting
Subplate (ISO 4401)
Nominal Size
NG25 (W.H 25)
Pilot Flow (fastest Switching)
35 l/min
Pilot Volume (3-pos Spring)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Viscosity Range
2.8 to 500 mm2/s
Weight
19.0 kg (2 Solenoids, Spring)
1620 Old Apex Road
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