Multi-stage Rotary Disc Valve Erosion Control

The single-stage pressure reduction is divided into multiple stages by adding intermediate discs with progressively smaller openings. The first disc has larger openings that reduce pressure partially, the second disc has smaller openings that reduce pressure further, and the third disc has the smallest openings for final pressure reduction. This segmentation distributes the pressure drop across multiple stages, reducing fluid velocity at each stage and minimizing erosion of individual discs and the valve body.

The valve is segmented into multiple discs (first, second, and third discs) with progressively smaller openings that create multiple pressure reduction stages. This segmentation allows pressure to be reduced incrementally rather than in a single step, maintaining lower fluid velocities and pressures throughout the valve assembly, which reduces fugitive emissions in high-pressure environments while preserving manufacturing simplicity.

The multiple discs are nested concentrically within the valve body, with each disc positioned along the fluid flow path. The first disc is positioned upstream with larger openings, the second disc is positioned downstream with medium openings, and the third disc is positioned furthest downstream with smallest openings. This nested arrangement allows multi-stage pressure reduction without requiring separate valve bodies or complex external structures, thereby minimizing erosion while controlling device complexity.

Instead of using a single disc with 2 holes, the invention uses multiple discs (first, second, and third discs) with progressively smaller openings. Each disc can be rotated independently to control flow through its respective openings. This segmentation allows for fine control of fluid flow by adjusting each disc's rotation angle, providing characterized Cv vs rotation curves with variable pressure reducing stages at each level, while maintaining ease of operation through simple rotary motion.