Does anyone know the standard for butterfly valve leakage?
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Does anyone know the standards for the leakage rate of butterfly valves? Are there any grade classifications?
The standards for leakage rates of butterfly valves typically follow the ANSI FCI-70/2 standard for control valve leakage. Soft seals can achieve a CLASS VI level, while metal seals generally reach CLASS IV. The leakage standards for triple-eccentric metal-sealed butterfly valves can comply with the API598/API6D standards for soft seals (zero leakage), which is a higher standard than that specified by ANSI FCI-70/2