Bosch Rexroth | H-4WEH25R6X6EW110N9K4
H-4WEH25R6X/6EW110N9K4
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The H-4WEH25R6X/6EW110N9K4 directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. In hydraulic automation it switches flow paths between pump, actuator, and tank according to electrical commands while its hydraulic pilot stage moves the main spool. Electro-hydraulic actuation allows low solenoid power to shift a larger NG25 main stage so the valve can be mounted where space is limited but high flow is demanded. A 4-way flow pattern provides four functional ports for pressure, return, and two work lines, matching the ISO 4401-10-09-0-05 mounting interface for easy manifold integration. The design uses an external X pilot oil supply and a separate external Y pilot oil return to prevent back-pressure from influencing spool position. The pilot stage centers with springs and therefore needs at least 13 bar pilot pressure to move, while the pilot circuit must not exceed 250 bar to protect seals and control elements. System cleanliness must be kept at ISO 4406 class 20/18/15 to maintain reliable operation and limit wear on the precision spool lands.
Ports P, A, and B can be pressurized up to 350 bar, allowing the valve to control heavy-duty cylinders or motors without leakage. Port T is limited to 250 bar so return lines must be sized accordingly, and port Y for drain and actuator chambers is restricted to 160 bar to safeguard the pilot stage. When symbol R is used at 350 bar the main stage passes up to 580 l/min, providing high flow with minimal pressure drop for rapid actuator movement. NBR sealing permits hydraulic fluid temperatures from −20 °C to +80 °C so the valve can start in cold conditions and run in warm reservoirs. An MTTFd of 100 years indicates a very low probability of dangerous failure, supporting safety calculations in machine directives. These limits define the hydraulic envelope for the H-4WEH25R6X/6EW110N9K4 valve and guide proper circuit design.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class (iso 4406)
20/18/15
Hydraulic Fluid Temp Max (nbr)
+80 C
Hydraulic Fluid Temp Min (nbr)
-20 C
Max Flow (symbol R At 350 Bar)
580 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, Ac)
160 bar
Min Pilot Pressure (x Ext., Spring-centered)
13 bar
Mttfd (type Weh)
100 years
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-10-09-0-05
Size
NG25
Way Configuration
4-way
1620 Old Apex Road
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