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Top-mounted ball valve is a valve body structure for the top-mounted design of high-performance ball valves, widely used in petroleum, natural gas, chemical industry, electric power, metallurgy, paper and other high-temperature, high-pressure and large pipeline conditions. The valve is suitable for water, oil, gas, steam, acid and alkali solutions and other media, with excellent sealing and corrosion resistance. The most important feature of the top-mounted ball valve is that the seal can be repaired and replaced online without disassembling the whole section of pipeline, which significantly reduces the downtime and maintenance costs. The product structure is sturdy, small flow resistance, rapid opening and closing, can be equipped with manual, pneumatic, electric and other driving methods, convenient to realize remote automation control. Its advantages include strong pressure resistance, long life, reliable sealing, especially suitable for continuous operation, frequent operation or working conditions requiring high safety. Top-mounted ball valves can not only realize medium cut-off and connection, but also meet the flow regulation needs, is the ideal choice for modern industrial fluid control system with high efficiency, safety and economy.