Bosch Rexroth | 4WEH22H7X6EG12N9DA
4WEH22H7X/6EG12N9DA
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The 4WEH22H7X/6EG12N9DA valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and serves as a 4-way control element in hydraulic automation circuits. Electro-hydraulic actuation shifts a spool with the D symbol between 2 stable positions to redirect pressure and return lines. The control spool is returned hydraulically once the pilot signal is removed, while a concealed manual override lets maintenance personnel reposition the spool during service work. The unit fits subplates that follow the ISO 4401-08-08-0-05 porting pattern, and its size 25 envelope accommodates medium-flow machinery. Pilot operation begins at 8 bar, allowing the valve to switch reliably even when the pilot circuit operates at relatively low pressure.
Pilot oil enters externally through port X and leaves externally through port Y, which keeps pilot flow separate from the main channels. Hydraulic fluid must meet ISO 4406 20/18/15 cleanliness to prevent wear on the close-fitting spool and bushing. The pilot stage tolerates pressures up to 210 bar, the same limit imposed on port Y when direct current control is employed. Main working ports P, A, and B withstand 280 bar, while the T port is rated for 250 bar to manage return flow without risk of case leakage. These pressure capabilities enable the valve to control cylinders and motors in high-load systems while maintaining predictable response and component longevity.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Hydraulic
Manual Override
Concealed
Max Pilot Pressure
210 bar
Max Pressure (p, A, B)
280 bar
Max Pressure (t Port)
250 bar
Max Pressure (y Port, Dc)
210 bar
Min Pilot Pressure
8 bar
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Size (ng)
25
Spool Positions
2
Spool Symbol
D
Way Configuration
4-way
1620 Old Apex Road
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