The flat-bottom eccentric semi-ball valve is an industry-first breakthrough! Featuring a novel structural profile, it represents international advanced engineering and successfully resolves the practical application challenges commonly associated with conventional eccentric semi-ball valves. The valve delivers a flat-bottom, straight-through flow path for ultra-low pressure loss, reliable bi-directional zero-leakage sealing, lightweight operating torque under full differential pressure, and seamless online maintenance for an extended operational lifespan. It is exceptionally suited for major water transmission pipelines and is widely utilized across municipal water supply and drainage, wastewater treatment, agricultural irrigation, and industrial water networks.