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DIN floating ball valve should meet the damands of DIN standard. DIN a technical scientific association, Deutsches Institut für Normung e. V. (DIN), engages in standardization activities that advance rationalization, quality assurance, environmental protection, safety and communication in industry, technology, science, government, and in the public domain. Recognized by the German Federal Government as Germany's national standards body, DIN has been a member of the International Organization for Standardization (ISO) since 1951. DIN floating ball valve, as many other floating ball valves,has ball floating inside the valve body, while a trunnion ball valve is fixed on its valve seat. In other words, it of course has the common parts of floating ball valve. A floating ball valve drifts toward to the downstream side and tightly pushes against the seat under the medium pressure to guarantee sealing reliability. The floating ball valve has simple structure, good sealing performance, however, the seat material is required to withstand the workload since the sealing pressure is exposed by the seat ring. Floating ball valve is mainly used in middle or low pressure working conditions, as it has unavailability of high performance seat material.