4WRL25E4-350S-3X/G24Z4/M

The 4WRL25E4-350S-3X/G24Z4/M valve belongs to the 4WRL Solenoid Valves series from Bosch Rexroth and serves as a proportional control element for hydraulic automation tasks such as regulating actuator speed and direction. Its nominal size is 25, providing port dimensions that match medium-to-large flow circuits. The valve bolts to manifolds using the ISO 4401-08-07-0-94 mounting interface, which standardizes installation across power units. A maximum flow capacity of 900 l/min allows the unit to modulate high volume streams without excessive pressure loss. Main ports p, a, and b tolerate operating pressures up to 350 bar, while return lines t, x, and y are limited to 250 bar to protect tank connections. Reliable shifting demands a minimum pilot pressure of 10 bar, so the pilot stage remains responsive under light system loads. Hydraulic oils with viscosities up to 800 mm²/s can be processed, giving latitude when temperature or fluid grade varies. Electrically, each coil measures 2.5 ohm at 20 °C, defining the resistance the drive electronics must overcome, and the assembled unit weighs 18 kg, which affects mounting hardware selection.

Supply voltage is fixed at 24 V DC to align with common mobile and industrial control supplies, and the design draws a maximum of 40 VA so power converters can be sized accordingly. Peak solenoid current reaches 2.7 A during full stroke energization, describing the load the controller must deliver for rated performance. A response time of 45 ms for a 0–100 % command step at 100 bar ensures timely flow adjustment in dynamic cycles. The enclosure meets IP65, granting protection against dust ingress and low-pressure water jets for use on open machinery. Electrical connection is made through a DIN 43650 / ISO 4400 plug, enabling rapid coil replacement and standardized wiring. Fluid cleanliness must stay within ISO 4406 code 18/16/13 to maintain spool accuracy and extend service life. The contamination rating pairs with compatible filtration strategies, and together with the electrical and mechanical limits above rounds out the operating envelope for this Bosch Rexroth valve.