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The composite vent valve is a valve device used in piping systems, and its main function is to automatically remove air from the pipeline and ensure the normal operation of the system. It combines the characteristics of float and float lever exhaust valves, capable of micro exhaust under pressure while performing large intake and exhaust in the first fill or other situations. This valve is suitable for pump outlets or water supply and distribution lines, which can improve the efficiency of pipelines and pumps, and quickly suck in outside air when negative pressure occurs in the pipe to avoid pipeline rupture. Common classifications include float composite exhaust valves, which are equipped with a float inside and can automatically open or close the exhaust port according to the accumulation of air in the pipe.