Bosch Rexroth | H-4WEH25HG6X6EW110N9DALB12
H-4WEH25HG6X/6EW110N9DAL/B12
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The H-4WEH25HG6X/6EW110N9DAL/B12 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. As a 4-way directional spool valve, it routes pressure fluid to and from actuators in hydraulic automation. The body conforms to size 25, supporting larger flow channels for high-volume circuits. A porting pattern following ISO 4401 simplifies subplate installation with standard interfaces. The valve passes up to 400 l/min when configured with spool symbol G, allowing rapid actuation of cylinders. Pressure at ports P, A, and B may reach 350 bar, enabling use in high-pressure systems. Three spool positions give neutral, extend, and retract functions for bidirectional motion control. Hydraulic spring chambers return the control spool to center, removing the need for mechanical springs. A high-power 4WE 6E pilot stage provides the necessary shifting force. A concealed N9 manual override lets maintenance personnel operate the spool during setup.
System cleanliness must be maintained at ISO 4406 code 20/18/15 to protect the sliding surfaces. Pilot lines may be pressurized up to 250 bar, matching typical supply pressures for the control stage. Back pressure in port T is limited to 250 bar, while the external drain port Y can withstand 160 bar on AC-operated units. Flow damping can be adjusted with a Ø1.2 mm throttle insert identified by the B12 suffix. Six M12 × 60 screws according to ISO 4762 secure the housing to the subplate. These fasteners require a tightening torque of 100 Nm to maintain seal integrity. The mounting hardware and torque figures help prevent leakage under full load. Adhering to the cleanliness level and pressure limits ensures stable operation throughout extended duty cycles.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol G, Ng25 W.h 25)
400 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 (external)
160 bar (AC)
Mounting Screws
6× M12×60 (ISO 4762)
Pilot Control Valve
4WE 6E (High-Power)
Porting Pattern
ISO 4401
Screw Tightening Torque
100 Nm
Size (ng)
25 (W.H 25)
Spool Positions
3 (Symbol G)
Throttle Insert Size
Ø1.2 mm (B12)
Valve Type
4-Way Directional Spool Valve
1620 Old Apex Road
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