Using the parameters: pressure: 25 Mpa temperature: -200 to 850 ° C Line speed: 30m / s PH value: 0 to 14 for medium: hot water, high temperature, high pressure steam, the heat exchange fluid, nitrogen, organic solvents, hydrocarbons, cryogenic liquid structural features: graphite rings, flexible graphite tape or flexible graphite preparation packing, different size ring molded products. Adapted to the medium of hot water, high temperature, high pressure steam, heat exchange fluid, nitrogen, organic solvents, hydrocarbons, cryogenic liquids, etc.. For compressors, pumps, valves, chemicals, instruments, meters, etc.