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Lubricated plug valve can be divided into conventional lubricated plug valves and pressure balanced plug valves. The special grease is injected from the top of the plug body between the valve cone hole and the plug body, forming an oil film to reduce the valve opening and closing torque, increase sealing and service life. The operating pressure can be up to 420MPa, with a maximum operating temperature of 325℃ and a maximum size of 600mm.