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In the selection of industrial valves, full bore and reduced bore often cause confusion. For ceramic ball valves, reducing the diameter is not merely a way to save material; it is an optimized solution that takes into account material properties, fluid dynamics, and engineering economics, and its overall performance is on par with that of metal full-bore valves. Ceramic ball valves feature a reduced-diameter design, which represents the optimal solution for balancing structural strength and flow performance within the shell dimensions specified by flange standards. Structure and Sealing: Ceramic ball valves require a structure ceramic layer of sufficient thickness; the reduced-diameter design provides space for the installation of the lining and other components, ensuring sealing stability under high pressure differences. Flow resistance and energy consumption: A venturi structure is used to optimize the flow channel, improving the energy conversion efficiency and reducing the friction coefficient. For example, when DN100 is reduced to DN80, the pressure loss at a flow rate of 3 m/s is only 0.031, which is negligible. Operation and lifespan: The reduced diameter decreases the contact area between the sphere and the valve seat, thereby reducing the operating torque and making operation easier. It also allows for the use of smaller actuators, which helps to reduce friction and extend the device’s lifespan. Traditionally, it was believed that necking would exacerbate erosion wear, but ceramic materials have overturned this notion. Its flow-through components are made of structural ceramics with a hardness of ≥ Hv1500, which is far higher than that of metals, enabling them to resist various types of wear caused by high flow rates. Moreover, all major global brands of imported ceramic ball valves feature a reduced-diameter design that complies with the GB/T 12237-2021 standard, and their reliability under actual operating conditions has been thoroughly verified. Ceramic ball valves can achieve full bore, but this requires reducing the thickness of the inner lining or enlarging the valve body, which significantly increases manufacturing complexity and material costs ； At the same time, full-bore spheres are heavy and generate large torque, requiring larger actuators which further increases the cost. When choosing a ceramic ball valve, there is no need to insist on a full-bore design. Thanks to its unique venturi design, excellent wear and corrosion resistance, and lightweight properties, ceramic reduced-bore valves outperform metal full-bore valves in terms of overall performance in almost all applications involving high erosion and high corrosion conditions.