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What are the judgment standards for valve internal leakage and precautions during operation?
After the valve is closed for 4-6 hours, use an infrared temperature measuring instrument to measure the temperature of the valve stem (near the valve body) or the metal temperature 150mm downstream of the valve body. If it is greater than 70°C, it is regarded as “internal leakage”. This judgment method is applicable to most internal leakage valves.