Valve is one of the important auxiliary systems of thermal power plant

and the valve leakage is the most common failure. The common causes of abnormal valve internal leakage are analyzed

and combined with several field cases of valve internal leakage treatment

it is found that the problem can be diagnosed by means of valve core tightness test

valve inspection and analysis

and the valve temperature can be effectively solved by taking targeted treatment measures such as valve renovation and actuator improvement

and the valve temperature can not exceed 55 ℃ without water reduction. The proposed diagnostic method reduces the analysis and treatment time of abnormal valve internal leakage

saves manpower and material resources

has a good effect

improves the thermal efficiency of the unit

ensures the safe and stable operation of the unit

and has a reference significance for the analysis and treatment of similar valve internal leakage faults.