4WRAB6EA12-1X/G12N9K4/MR

The 4WRAB6EA12-1X/G12N9K4/MR proportional directional valve is produced by Bosch Rexroth within the 4WRA Proportional Directional Valves series. It meters hydraulic flow in automated systems that need variable actuator motion. With a nominal size of 6, the envelope matches compact manifold layouts used in small presses and handling modules. The EA spool symbol defines the internal land arrangement so that control ports receive pressure and tank return in the specified sequence. A maximum operating pressure of 350 bar at ports P, A, and B allows the unit to direct high-pressure supply without loss of rigidity, while the T port is limited to 210 bar to protect the return circuit. The valve passes up to 42 l/min, giving moderate speed capability to cylinders or motors. Each port uses an 8 mm diameter, ensuring consistent line sizing across P, A, B, and T. The interface follows the ISO 4401-03-02-0-05 porting pattern, and subplate mounting lets maintenance crews replace the unit without disturbing hard plumbing.

Fluid cleanliness must reach ISO 4406 20/18/15 so the precision spool is not eroded by particulate contamination. Because the installation position can be any orientation, designers have freedom to place the valve in crowded power packs. A concealed manual override is included, allowing service personnel to shift the spool for testing while shielding the button from accidental activation. The enclosure meets IP65, which blocks dust and low-pressure water jets when the electrical connector is engaged. Surface temperature may rise to 150 °C, so adjacent components must tolerate that heat during continuous duty. NBR seals are fitted to maintain compatibility with standard mineral oils at the specified temperatures. An individual weight of 2.0 kg keeps lifting requirements low during assembly. The mean time to dangerous failure is 150 years, indicating a long statistical service life in safety-related circuits.