The VN6 series, with a partially spherical V-shaped notch core providing approximately equal percentage flow characteristics, is an angular stroke control valve that uses the V-shaped notch core to rotate against the sealing surface within a small opening range to control fluid flow. The V-shaped notch ball core significantly increases the adjustable flow rate ratio, and when combined with a specially designed sealing valve seat with a unique elastic lip structure, it has excellent shear and anti blocking functions for fiber and particle media. Therefore, it is particularly suitable for control systems that require large adjustable ratios, as well as for controlling fluids containing fibers and slurries.