Bosch Rexroth | H-4WEH25E6X6EW110N9ETDK25LB10D3V
H-4WEH25E6X/6EW110N9ETDK25L/B10D3V
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The H-4WEH25E6X/6EW110N9ETDK25L/B10D3V directional spool valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation circuits that require reliable flow control. It is built with a nominal size of 25, allowing compatibility with medium to large lines, and uses spool symbol E to define its flow paths during actuation. The valve handles a maximum flow of 650 l/min at 350 bar so it can shift high volumes without exceeding pressure limits, and its maximum operating pressure on ports P, A, and B is 350 bar to match common system ratings. Pilot oil is taken internally for both supply and return, simplifying external piping, while the pilot pressure is reduced to 45 bar to protect the control stage from full line pressure. A minimum pilot pressure of 13 bar must be present to center the three-position spool, and a concealed manual override designated N9 provides emergency actuation without exposing moving parts.
Fluid cleanliness must meet class 20/18/15 according to ISO 4406 to prevent premature wear of the precision spool lands. The pilot stage tolerates pressures up to 250 bar, and port T may also see a maximum of 250 bar, while the internal Y drain is limited to 160 bar, so circuit designers must connect each line within these limits. Mounting follows the ISO 4401-08-08-0-05 porting pattern, and the valve body should be secured with screws tightened to 100 Nm to maintain sealing integrity. A throttle insert with a 1.0 mm orifice, labeled B10, can be installed to fine-tune response times, and the assembled unit with two solenoids and spring centering weighs 19.0 kg, which influences manifold support requirements.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol E, 350 Bar)
650 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (internal, Ac)
160 bar
Min Pilot Pressure (3-pos Centered)
13 bar
Nominal Size (ng)
25
Pilot Oil Supply/return
Internal/Internal (ET)
Pilot Pressure Reduced To
45 bar (D3)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Spool Symbol
E
Throttle Insert
Ø 1.0 mm (B10)
Weight (2 Solenoids, Spring-centered)
19.0 kg
1620 Old Apex Road
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