Aims: This study supports Doppler ultrasound calibration and professional training through the development of a circulatory system phantom capable of simulating various flow types associated with cardiac diseases: continuous, pulsatile, retrograde, intermittent, and turbulent. Methods: The phantom was built using materials that mimic tissue, vessels, and blood. Vessels were 3D printed in a Y-shape using PLA, while the blood analog consisted of a glycerin and deionized water mix. The system includes an acrylic box, a peristaltic pump (2–5 l/min), solenoid valves, and sensors for flow, pressure, and velocity, all managed by an Arduino Uno microcontroller. A calibration grid using steel spheres of varying diameters was used to verify ultrasound measurements. Flow visualization was achieved with a Samsung Madison L5-13 IS linear transducer (6–12 MHz) and an Accuvix V10 ultrasound machine. Results: The phantom successfully simulated all intended flow types: pulsatile (10–150 cm/s), laminar (10–60 cm/s), turbulent (+200 cm/s), retrograde (20–50 cm/s), and intermittent (5–30 cm/s). Doppler imaging showed readings consistent with clinical expectations, validating the model's functionality. Conclusion: The developed phantom effectively reproduces physiological flow patterns, supporting both device calibration and medical training. Doppler measurements confirmed the system's reliability for educational and technical purposes.