The 4WE 10 valve is a solenoid-operated directional piston valve, compatible with DIN 24 340, ISO 4401, and CETOP-RP 121 H drilling patterns. It features oil-immersed DC solenoids, removable coils that can be rotated every 90°. Maintenance is simplified, requiring no opening of the chamber for coil replacement. It includes individual electrical connections, optional emergency actuation, and adjustable operating time.