Bosch Rexroth | 4WEH22HD7X6EW110N9DAL-CSA
4WEH22HD7X/6EW110N9DAL CSA
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The 4WEH22HD7X/6EW110N9DAL CSA valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series and is intended to route pressurized oil to actuators in automated hydraulic machinery. A nominal size of 25 positions the valve for systems that employ NG25 subplates, while the ISO 4401-08-08-0-05 porting pattern aligns the mounting holes with common manifold layouts. Its control spool is returned hydraulically, removing the need for a spring and enabling remote pressure adjustment. The valve withstands 280 bar at ports P, A, and B, so it can handle high-pressure cylinder circuits, and it passes up to 450 l/min through symbol Hd for large-volume flow demands. Oil with viscosities as high as 500 mm²/s can be used, allowing cold-start operation, and a temperature ceiling of 80 °C maintains seal integrity under continuous load. Filtration to ISO 4406 20/18/15 is required to protect the precision spool lands, and a single-solenoid configuration weighs 11.5 kg for manageable installation.
Performance of the pilot stage influences response time, and a pilot flow of 35 l/min is specified to achieve the fastest switching in cyclic duties. For the two-spool arrangement, a pilot oil volume of 15.28 cm³ limits displacement, reducing actuation delay. Pilot pressure may rise to 210 bar to ensure firm spool movement, yet the valve still shifts reliably with only 8 bar available in low-pressure standby modes. Port T tolerates back-pressure up to 250 bar, while the external drain at port Y is rated for 160 bar to protect the housing from excess case pressure. A concealed N9 manual override lets maintenance staff operate the spool locally without leaving protruding hardware that could snag during machine operation.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Control Spool Return
Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol Hd)
450 l/min
Max Fluid Temperature
80 °C
Max Fluid Viscosity
500 mm²/s
Max Operating Pressure (p/a/b)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external, Ac)
160 bar
Min Pilot Pressure (2-spool, Hyd End)
8 bar
Nominal Size (ng)
25
Pilot Flow For Fastest Switching
35 l/min
Pilot Volume (2-spool)
15.28 cm³
Porting Pattern
ISO 4401-08-08-0-05
Weight (one Solenoid)
11.5 kg
1620 Old Apex Road
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