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Meaning of valve model numbers: Valve model numbers should generally indicate elements such as the type of valve, driving method, connection style, structural features, nominal pressure, material of the sealing surface, and material of the valve body. What does D371X-16C mean? What does the model D371F46-16C mean? Is there any difference between these two models? Both D371X-16C and D371F46-16C are model numbers for butterfly valves. Based on the valve model coding method, we can first break down and analyze these two butterfly valve models. D371X-16C: D butterfly valve, 3 turbine-driven, 7 wafer-type connections, 1 centerline design, X rubber-sealed seat, 16 nominal pressure of 16 kilograms, C valve body material is carbon steel. D371F46-16C: D butterfly valve, 3 turbine-driven, 7 wafer-type connections, 1 centerline design; F46 valve seat material is perfluoroethylene propylene; nominal pressure of 16 kg at 16 bar; C valve body material is carbon steel. So D371X-16C is a turbine-driven wafer-type rubber soft-sealed butterfly valve ； D371F46-16C is a flanged fluorinated butterfly valve. It can be seen that the difference between D371X-16C and D371F46-16C lies in the material of their valve seat sealing surfaces: one uses a rubber valve seat, while the other uses a perfluoroethylene propylene valve seat. Additionally, Tianjin Bonai Precision Control Valve Manufacturer provides further clarification: F46 is the same as FEP, whose Chinese name is polyperfluoroethylene propylene. In appearance, the F46 is grayish-white and semi-transparent ； It possesses strong corrosion resistance and chemical stability.