When the valve has working medium leakage, especially the high temperature valve or low temperature valve, the heat emitted or absorbed by the working medium will lead to the rise or fall of the tube wall temperature. If the valve leakage remains unchanged, the heat transfer process tends to be stable after a period of time, and the heat emitted or absorbed remains at a certain value with the tube wall temperature. When using the method of valve internal leakage temperature to detect valve leakage, temperature sensors are installed on the upper and lower reaches of the valve to measure the ambient temperature of the valve, which is used as the globe valve characteristics parameter to detect whether the valve has internal leakage. After analyzing the instrument data, the internal leakage of the valve is judged.

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