4WE6D73-6X/EG24N9K72L/A12

The 4WE6D73-6X/EG24N9K72L/A12 is a directional spool valve produced by Bosch Rexroth within the WE Directional Spool Valves series. It directs hydraulic flow to actuators in automated machinery where rapid, repeatable position control is required. A porting pattern compliant with ISO 4401-03-02-0-05 lets the valve bolt directly to common NG6 subplates without extra adapters. The pressure limit of 350 bar at ports A, B, and P enables the unit to operate in high-pressure circuits typical of industrial presses and injection molds. The tank line tolerates up to 210 bar, so back-pressure from accumulators or long return pipes does not damage internal seals. A flow capacity of 80 l/min supports medium-size cylinders and motors while minimizing pressure drop. The dual solenoids run on a 24 V DC supply and draw 1.25 A, providing reliable shifting force without exceeding standard control-cabinet power budgets. Coil surfaces may reach 120 °C during continuous duty, and the 1.95 kg assembly must be mounted where ambient heat and support structure can sustain that thermal load.

An IP65 enclosure guards the electrical section against dust ingress and water jets, allowing installation beside wash-down equipment. The M12×1 four-pole connector designated K72L supplies power and signals through a single plug, simplifying replacement in modular manifolds. Because the valve can be installed in any orientation, designers can align manifolds horizontally or vertically to suit restricted spaces. A concealed N9 manual override lets maintenance personnel shift the spool without energizing the coil, yet its recessed design prevents accidental actuation. When the override is used, tank port pressure must stay below 50 bar to avoid excessive handle force and seal wear. The permitted switching frequency of three cycles per second, identified by code a12, defines the maximum command rate for control loops. Safety calculations benefit from a mean time to dangerous failure of 300 years under EN ISO 13849, indicating extremely low probability of hazardous malfunction. Combined, these installation and safety features allow the valve to handle demanding duty cycles in automated systems without compromising usability or compliance.