The Rexroth R900518087 FD25KA21/B04V is a high-performance 2-way flow control valve designed for precise regulation of hydraulic fluid flow. This valve allows for fine-tuned control of flow in one direction while permitting free, unrestricted flow in the opposite direction, thanks to its integrated check valve. Its sandwich plate design enables easy and compact installation between a directional valve and its subplate, conforming to the ISO 4401-08 mounting pattern. Featuring a lockable rotary knob for secure and repeatable adjustments, this valve is built for reliability and durability in demanding industrial hydraulic systems where accurate speed control of actuators is critical.